1 | /* Emit RTL for the GNU C-Compiler expander. |
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2 | Copyright (C) 1987, 88, 92, 93, 94, 1995 Free Software Foundation, Inc. |
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3 | |
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4 | This file is part of GNU CC. |
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5 | |
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6 | GNU CC is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 2, or (at your option) |
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9 | any later version. |
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10 | |
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11 | GNU CC is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with GNU CC; see the file COPYING. If not, write to |
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18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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19 | Boston, MA 02111-1307, USA. */ |
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20 | |
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21 | |
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22 | /* Middle-to-low level generation of rtx code and insns. |
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23 | |
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24 | This file contains the functions `gen_rtx', `gen_reg_rtx' |
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25 | and `gen_label_rtx' that are the usual ways of creating rtl |
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26 | expressions for most purposes. |
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27 | |
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28 | It also has the functions for creating insns and linking |
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29 | them in the doubly-linked chain. |
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30 | |
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31 | The patterns of the insns are created by machine-dependent |
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32 | routines in insn-emit.c, which is generated automatically from |
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33 | the machine description. These routines use `gen_rtx' to make |
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34 | the individual rtx's of the pattern; what is machine dependent |
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35 | is the kind of rtx's they make and what arguments they use. */ |
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36 | |
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37 | #include "config.h" |
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38 | #ifdef __STDC__ |
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39 | #include <stdarg.h> |
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40 | #else |
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41 | #include <varargs.h> |
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42 | #endif |
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43 | #include "rtl.h" |
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44 | #include "tree.h" |
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45 | #include "flags.h" |
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46 | #include "function.h" |
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47 | #include "expr.h" |
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48 | #include "regs.h" |
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49 | #include "insn-config.h" |
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50 | #include "real.h" |
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51 | #include "obstack.h" |
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52 | |
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53 | #include "bytecode.h" |
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54 | #include "machmode.h" |
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55 | #include "bc-opcode.h" |
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56 | #include "bc-typecd.h" |
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57 | #include "bc-optab.h" |
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58 | #include "bc-emit.h" |
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59 | |
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60 | #include <stdio.h> |
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61 | |
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62 | |
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63 | /* Opcode names */ |
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64 | #ifdef BCDEBUG_PRINT_CODE |
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65 | char *opcode_name[] = |
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66 | { |
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67 | #include "bc-opname.h" |
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68 | |
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69 | "***END***" |
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70 | }; |
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71 | #endif |
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72 | |
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73 | |
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74 | /* Commonly used modes. */ |
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75 | |
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76 | enum machine_mode byte_mode; /* Mode whose width is BITS_PER_UNIT. */ |
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77 | enum machine_mode word_mode; /* Mode whose width is BITS_PER_WORD. */ |
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78 | enum machine_mode ptr_mode; /* Mode whose width is POINTER_SIZE. */ |
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79 | |
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80 | /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function. |
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81 | After rtl generation, it is 1 plus the largest register number used. */ |
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82 | |
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83 | int reg_rtx_no = LAST_VIRTUAL_REGISTER + 1; |
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84 | |
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85 | /* This is *not* reset after each function. It gives each CODE_LABEL |
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86 | in the entire compilation a unique label number. */ |
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87 | |
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88 | static int label_num = 1; |
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89 | |
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90 | /* Lowest label number in current function. */ |
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91 | |
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92 | static int first_label_num; |
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93 | |
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94 | /* Highest label number in current function. |
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95 | Zero means use the value of label_num instead. |
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96 | This is nonzero only when belatedly compiling an inline function. */ |
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97 | |
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98 | static int last_label_num; |
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99 | |
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100 | /* Value label_num had when set_new_first_and_last_label_number was called. |
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101 | If label_num has not changed since then, last_label_num is valid. */ |
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102 | |
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103 | static int base_label_num; |
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104 | |
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105 | /* Nonzero means do not generate NOTEs for source line numbers. */ |
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106 | |
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107 | static int no_line_numbers; |
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108 | |
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109 | /* Commonly used rtx's, so that we only need space for one copy. |
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110 | These are initialized once for the entire compilation. |
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111 | All of these except perhaps the floating-point CONST_DOUBLEs |
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112 | are unique; no other rtx-object will be equal to any of these. */ |
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113 | |
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114 | rtx pc_rtx; /* (PC) */ |
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115 | rtx cc0_rtx; /* (CC0) */ |
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116 | rtx cc1_rtx; /* (CC1) (not actually used nowadays) */ |
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117 | rtx const0_rtx; /* (CONST_INT 0) */ |
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118 | rtx const1_rtx; /* (CONST_INT 1) */ |
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119 | rtx const2_rtx; /* (CONST_INT 2) */ |
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120 | rtx constm1_rtx; /* (CONST_INT -1) */ |
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121 | rtx const_true_rtx; /* (CONST_INT STORE_FLAG_VALUE) */ |
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122 | |
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123 | /* We record floating-point CONST_DOUBLEs in each floating-point mode for |
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124 | the values of 0, 1, and 2. For the integer entries and VOIDmode, we |
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125 | record a copy of const[012]_rtx. */ |
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126 | |
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127 | rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE]; |
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128 | |
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129 | REAL_VALUE_TYPE dconst0; |
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130 | REAL_VALUE_TYPE dconst1; |
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131 | REAL_VALUE_TYPE dconst2; |
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132 | REAL_VALUE_TYPE dconstm1; |
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133 | |
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134 | /* All references to the following fixed hard registers go through |
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135 | these unique rtl objects. On machines where the frame-pointer and |
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136 | arg-pointer are the same register, they use the same unique object. |
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137 | |
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138 | After register allocation, other rtl objects which used to be pseudo-regs |
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139 | may be clobbered to refer to the frame-pointer register. |
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140 | But references that were originally to the frame-pointer can be |
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141 | distinguished from the others because they contain frame_pointer_rtx. |
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142 | |
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143 | When to use frame_pointer_rtx and hard_frame_pointer_rtx is a little |
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144 | tricky: until register elimination has taken place hard_frame_pointer_rtx |
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145 | should be used if it is being set, and frame_pointer_rtx otherwise. After |
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146 | register elimination hard_frame_pointer_rtx should always be used. |
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147 | On machines where the two registers are same (most) then these are the |
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148 | same. |
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149 | |
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150 | In an inline procedure, the stack and frame pointer rtxs may not be |
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151 | used for anything else. */ |
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152 | rtx stack_pointer_rtx; /* (REG:Pmode STACK_POINTER_REGNUM) */ |
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153 | rtx frame_pointer_rtx; /* (REG:Pmode FRAME_POINTER_REGNUM) */ |
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154 | rtx hard_frame_pointer_rtx; /* (REG:Pmode HARD_FRAME_POINTER_REGNUM) */ |
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155 | rtx arg_pointer_rtx; /* (REG:Pmode ARG_POINTER_REGNUM) */ |
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156 | rtx struct_value_rtx; /* (REG:Pmode STRUCT_VALUE_REGNUM) */ |
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157 | rtx struct_value_incoming_rtx; /* (REG:Pmode STRUCT_VALUE_INCOMING_REGNUM) */ |
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158 | rtx static_chain_rtx; /* (REG:Pmode STATIC_CHAIN_REGNUM) */ |
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159 | rtx static_chain_incoming_rtx; /* (REG:Pmode STATIC_CHAIN_INCOMING_REGNUM) */ |
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160 | rtx pic_offset_table_rtx; /* (REG:Pmode PIC_OFFSET_TABLE_REGNUM) */ |
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161 | |
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162 | rtx virtual_incoming_args_rtx; /* (REG:Pmode VIRTUAL_INCOMING_ARGS_REGNUM) */ |
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163 | rtx virtual_stack_vars_rtx; /* (REG:Pmode VIRTUAL_STACK_VARS_REGNUM) */ |
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164 | rtx virtual_stack_dynamic_rtx; /* (REG:Pmode VIRTUAL_STACK_DYNAMIC_REGNUM) */ |
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165 | rtx virtual_outgoing_args_rtx; /* (REG:Pmode VIRTUAL_OUTGOING_ARGS_REGNUM) */ |
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166 | |
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167 | /* We make one copy of (const_int C) where C is in |
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168 | [- MAX_SAVED_CONST_INT, MAX_SAVED_CONST_INT] |
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169 | to save space during the compilation and simplify comparisons of |
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170 | integers. */ |
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171 | |
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172 | #define MAX_SAVED_CONST_INT 64 |
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173 | |
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174 | static rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1]; |
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175 | |
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176 | /* The ends of the doubly-linked chain of rtl for the current function. |
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177 | Both are reset to null at the start of rtl generation for the function. |
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178 | |
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179 | start_sequence saves both of these on `sequence_stack' along with |
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180 | `sequence_rtl_expr' and then starts a new, nested sequence of insns. */ |
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181 | |
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182 | static rtx first_insn = NULL; |
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183 | static rtx last_insn = NULL; |
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184 | |
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185 | /* RTL_EXPR within which the current sequence will be placed. Use to |
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186 | prevent reuse of any temporaries within the sequence until after the |
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187 | RTL_EXPR is emitted. */ |
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188 | |
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189 | tree sequence_rtl_expr = NULL; |
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190 | |
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191 | /* INSN_UID for next insn emitted. |
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192 | Reset to 1 for each function compiled. */ |
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193 | |
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194 | static int cur_insn_uid = 1; |
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195 | |
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196 | /* Line number and source file of the last line-number NOTE emitted. |
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197 | This is used to avoid generating duplicates. */ |
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198 | |
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199 | static int last_linenum = 0; |
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200 | static char *last_filename = 0; |
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201 | |
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202 | /* A vector indexed by pseudo reg number. The allocated length |
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203 | of this vector is regno_pointer_flag_length. Since this |
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204 | vector is needed during the expansion phase when the total |
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205 | number of registers in the function is not yet known, |
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206 | it is copied and made bigger when necessary. */ |
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207 | |
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208 | char *regno_pointer_flag; |
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209 | int regno_pointer_flag_length; |
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210 | |
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211 | /* Indexed by pseudo register number, gives the rtx for that pseudo. |
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212 | Allocated in parallel with regno_pointer_flag. */ |
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213 | |
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214 | rtx *regno_reg_rtx; |
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215 | |
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216 | /* Stack of pending (incomplete) sequences saved by `start_sequence'. |
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217 | Each element describes one pending sequence. |
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218 | The main insn-chain is saved in the last element of the chain, |
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219 | unless the chain is empty. */ |
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220 | |
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221 | struct sequence_stack *sequence_stack; |
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222 | |
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223 | /* start_sequence and gen_sequence can make a lot of rtx expressions which are |
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224 | shortly thrown away. We use two mechanisms to prevent this waste: |
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225 | |
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226 | First, we keep a list of the expressions used to represent the sequence |
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227 | stack in sequence_element_free_list. |
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228 | |
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229 | Second, for sizes up to 5 elements, we keep a SEQUENCE and its associated |
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230 | rtvec for use by gen_sequence. One entry for each size is sufficient |
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231 | because most cases are calls to gen_sequence followed by immediately |
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232 | emitting the SEQUENCE. Reuse is safe since emitting a sequence is |
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233 | destructive on the insn in it anyway and hence can't be redone. |
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234 | |
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235 | We do not bother to save this cached data over nested function calls. |
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236 | Instead, we just reinitialize them. */ |
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237 | |
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238 | #define SEQUENCE_RESULT_SIZE 5 |
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239 | |
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240 | static struct sequence_stack *sequence_element_free_list; |
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241 | static rtx sequence_result[SEQUENCE_RESULT_SIZE]; |
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242 | |
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243 | extern int rtx_equal_function_value_matters; |
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244 | |
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245 | /* Filename and line number of last line-number note, |
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246 | whether we actually emitted it or not. */ |
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247 | extern char *emit_filename; |
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248 | extern int emit_lineno; |
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249 | |
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250 | rtx change_address (); |
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251 | void init_emit (); |
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252 | |
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253 | extern struct obstack *rtl_obstack; |
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254 | |
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255 | extern int stack_depth; |
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256 | extern int max_stack_depth; |
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257 | |
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258 | /* rtx gen_rtx (code, mode, [element1, ..., elementn]) |
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259 | ** |
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260 | ** This routine generates an RTX of the size specified by |
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261 | ** <code>, which is an RTX code. The RTX structure is initialized |
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262 | ** from the arguments <element1> through <elementn>, which are |
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263 | ** interpreted according to the specific RTX type's format. The |
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264 | ** special machine mode associated with the rtx (if any) is specified |
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265 | ** in <mode>. |
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266 | ** |
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267 | ** gen_rtx can be invoked in a way which resembles the lisp-like |
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268 | ** rtx it will generate. For example, the following rtx structure: |
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269 | ** |
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270 | ** (plus:QI (mem:QI (reg:SI 1)) |
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271 | ** (mem:QI (plusw:SI (reg:SI 2) (reg:SI 3)))) |
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272 | ** |
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273 | ** ...would be generated by the following C code: |
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274 | ** |
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275 | ** gen_rtx (PLUS, QImode, |
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276 | ** gen_rtx (MEM, QImode, |
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277 | ** gen_rtx (REG, SImode, 1)), |
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278 | ** gen_rtx (MEM, QImode, |
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279 | ** gen_rtx (PLUS, SImode, |
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280 | ** gen_rtx (REG, SImode, 2), |
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281 | ** gen_rtx (REG, SImode, 3)))), |
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282 | */ |
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283 | |
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284 | /*VARARGS2*/ |
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285 | rtx |
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286 | gen_rtx VPROTO((enum rtx_code code, enum machine_mode mode, ...)) |
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287 | { |
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288 | #ifndef __STDC__ |
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289 | enum rtx_code code; |
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290 | enum machine_mode mode; |
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291 | #endif |
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292 | va_list p; |
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293 | register int i; /* Array indices... */ |
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294 | register char *fmt; /* Current rtx's format... */ |
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295 | register rtx rt_val; /* RTX to return to caller... */ |
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296 | |
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297 | VA_START (p, mode); |
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298 | |
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299 | #ifndef __STDC__ |
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300 | code = va_arg (p, enum rtx_code); |
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301 | mode = va_arg (p, enum machine_mode); |
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302 | #endif |
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303 | |
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304 | if (code == CONST_INT) |
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305 | { |
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306 | HOST_WIDE_INT arg = va_arg (p, HOST_WIDE_INT); |
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307 | |
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308 | if (arg >= - MAX_SAVED_CONST_INT && arg <= MAX_SAVED_CONST_INT) |
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309 | return const_int_rtx[arg + MAX_SAVED_CONST_INT]; |
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310 | |
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311 | if (const_true_rtx && arg == STORE_FLAG_VALUE) |
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312 | return const_true_rtx; |
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313 | |
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314 | rt_val = rtx_alloc (code); |
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315 | INTVAL (rt_val) = arg; |
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316 | } |
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317 | else if (code == REG) |
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318 | { |
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319 | int regno = va_arg (p, int); |
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320 | |
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321 | /* In case the MD file explicitly references the frame pointer, have |
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322 | all such references point to the same frame pointer. This is used |
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323 | during frame pointer elimination to distinguish the explicit |
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324 | references to these registers from pseudos that happened to be |
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325 | assigned to them. |
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326 | |
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327 | If we have eliminated the frame pointer or arg pointer, we will |
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328 | be using it as a normal register, for example as a spill register. |
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329 | In such cases, we might be accessing it in a mode that is not |
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330 | Pmode and therefore cannot use the pre-allocated rtx. |
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331 | |
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332 | Also don't do this when we are making new REGs in reload, |
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333 | since we don't want to get confused with the real pointers. */ |
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334 | |
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335 | if (frame_pointer_rtx && regno == FRAME_POINTER_REGNUM && mode == Pmode |
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336 | && ! reload_in_progress) |
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337 | return frame_pointer_rtx; |
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338 | #if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM |
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339 | if (hard_frame_pointer_rtx && regno == HARD_FRAME_POINTER_REGNUM |
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340 | && mode == Pmode && ! reload_in_progress) |
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341 | return hard_frame_pointer_rtx; |
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342 | #endif |
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343 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM && HARD_FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
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344 | if (arg_pointer_rtx && regno == ARG_POINTER_REGNUM && mode == Pmode |
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345 | && ! reload_in_progress) |
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346 | return arg_pointer_rtx; |
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347 | #endif |
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348 | if (stack_pointer_rtx && regno == STACK_POINTER_REGNUM && mode == Pmode |
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349 | && ! reload_in_progress) |
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350 | return stack_pointer_rtx; |
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351 | else |
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352 | { |
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353 | rt_val = rtx_alloc (code); |
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354 | rt_val->mode = mode; |
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355 | REGNO (rt_val) = regno; |
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356 | return rt_val; |
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357 | } |
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358 | } |
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359 | else |
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360 | { |
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361 | rt_val = rtx_alloc (code); /* Allocate the storage space. */ |
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362 | rt_val->mode = mode; /* Store the machine mode... */ |
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363 | |
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364 | fmt = GET_RTX_FORMAT (code); /* Find the right format... */ |
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365 | for (i = 0; i < GET_RTX_LENGTH (code); i++) |
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366 | { |
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367 | switch (*fmt++) |
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368 | { |
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369 | case '0': /* Unused field. */ |
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370 | break; |
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371 | |
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372 | case 'i': /* An integer? */ |
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373 | XINT (rt_val, i) = va_arg (p, int); |
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374 | break; |
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375 | |
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376 | case 'w': /* A wide integer? */ |
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377 | XWINT (rt_val, i) = va_arg (p, HOST_WIDE_INT); |
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378 | break; |
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379 | |
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380 | case 's': /* A string? */ |
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381 | XSTR (rt_val, i) = va_arg (p, char *); |
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382 | break; |
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383 | |
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384 | case 'e': /* An expression? */ |
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385 | case 'u': /* An insn? Same except when printing. */ |
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386 | XEXP (rt_val, i) = va_arg (p, rtx); |
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387 | break; |
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388 | |
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389 | case 'E': /* An RTX vector? */ |
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390 | XVEC (rt_val, i) = va_arg (p, rtvec); |
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391 | break; |
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392 | |
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393 | default: |
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394 | abort (); |
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395 | } |
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396 | } |
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397 | } |
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398 | va_end (p); |
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399 | return rt_val; /* Return the new RTX... */ |
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400 | } |
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401 | |
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402 | /* gen_rtvec (n, [rt1, ..., rtn]) |
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403 | ** |
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404 | ** This routine creates an rtvec and stores within it the |
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405 | ** pointers to rtx's which are its arguments. |
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406 | */ |
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407 | |
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408 | /*VARARGS1*/ |
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409 | rtvec |
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410 | gen_rtvec VPROTO((int n, ...)) |
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411 | { |
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412 | #ifndef __STDC__ |
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413 | int n; |
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414 | #endif |
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415 | int i; |
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416 | va_list p; |
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417 | rtx *vector; |
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418 | |
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419 | VA_START (p, n); |
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420 | |
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421 | #ifndef __STDC__ |
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422 | n = va_arg (p, int); |
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423 | #endif |
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424 | |
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425 | if (n == 0) |
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426 | return NULL_RTVEC; /* Don't allocate an empty rtvec... */ |
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427 | |
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428 | vector = (rtx *) alloca (n * sizeof (rtx)); |
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429 | |
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430 | for (i = 0; i < n; i++) |
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431 | vector[i] = va_arg (p, rtx); |
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432 | va_end (p); |
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433 | |
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434 | return gen_rtvec_v (n, vector); |
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435 | } |
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436 | |
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437 | rtvec |
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438 | gen_rtvec_v (n, argp) |
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439 | int n; |
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440 | rtx *argp; |
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441 | { |
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442 | register int i; |
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443 | register rtvec rt_val; |
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444 | |
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445 | if (n == 0) |
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446 | return NULL_RTVEC; /* Don't allocate an empty rtvec... */ |
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447 | |
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448 | rt_val = rtvec_alloc (n); /* Allocate an rtvec... */ |
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449 | |
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450 | for (i = 0; i < n; i++) |
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451 | rt_val->elem[i].rtx = *argp++; |
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452 | |
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453 | return rt_val; |
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454 | } |
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455 | |
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456 | /* Generate a REG rtx for a new pseudo register of mode MODE. |
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457 | This pseudo is assigned the next sequential register number. */ |
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458 | |
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459 | rtx |
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460 | gen_reg_rtx (mode) |
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461 | enum machine_mode mode; |
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462 | { |
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463 | register rtx val; |
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464 | |
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465 | /* Don't let anything called by or after reload create new registers |
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466 | (actually, registers can't be created after flow, but this is a good |
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467 | approximation). */ |
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468 | |
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469 | if (reload_in_progress || reload_completed) |
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470 | abort (); |
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471 | |
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472 | if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT |
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473 | || GET_MODE_CLASS (mode) == MODE_COMPLEX_INT) |
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474 | { |
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475 | /* For complex modes, don't make a single pseudo. |
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476 | Instead, make a CONCAT of two pseudos. |
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477 | This allows noncontiguous allocation of the real and imaginary parts, |
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478 | which makes much better code. Besides, allocating DCmode |
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479 | pseudos overstrains reload on some machines like the 386. */ |
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480 | rtx realpart, imagpart; |
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481 | int size = GET_MODE_UNIT_SIZE (mode); |
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482 | enum machine_mode partmode |
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483 | = mode_for_size (size * BITS_PER_UNIT, |
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484 | (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT |
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485 | ? MODE_FLOAT : MODE_INT), |
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486 | 0); |
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487 | |
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488 | realpart = gen_reg_rtx (partmode); |
---|
489 | imagpart = gen_reg_rtx (partmode); |
---|
490 | return gen_rtx (CONCAT, mode, realpart, imagpart); |
---|
491 | } |
---|
492 | |
---|
493 | /* Make sure regno_pointer_flag and regno_reg_rtx are large |
---|
494 | enough to have an element for this pseudo reg number. */ |
---|
495 | |
---|
496 | if (reg_rtx_no == regno_pointer_flag_length) |
---|
497 | { |
---|
498 | rtx *new1; |
---|
499 | char *new = |
---|
500 | (char *) oballoc (regno_pointer_flag_length * 2); |
---|
501 | bcopy (regno_pointer_flag, new, regno_pointer_flag_length); |
---|
502 | bzero (&new[regno_pointer_flag_length], regno_pointer_flag_length); |
---|
503 | regno_pointer_flag = new; |
---|
504 | |
---|
505 | new1 = (rtx *) oballoc (regno_pointer_flag_length * 2 * sizeof (rtx)); |
---|
506 | bcopy ((char *) regno_reg_rtx, (char *) new1, |
---|
507 | regno_pointer_flag_length * sizeof (rtx)); |
---|
508 | bzero ((char *) &new1[regno_pointer_flag_length], |
---|
509 | regno_pointer_flag_length * sizeof (rtx)); |
---|
510 | regno_reg_rtx = new1; |
---|
511 | |
---|
512 | regno_pointer_flag_length *= 2; |
---|
513 | } |
---|
514 | |
---|
515 | val = gen_rtx (REG, mode, reg_rtx_no); |
---|
516 | regno_reg_rtx[reg_rtx_no++] = val; |
---|
517 | return val; |
---|
518 | } |
---|
519 | |
---|
520 | /* Identify REG as a probable pointer register. */ |
---|
521 | |
---|
522 | void |
---|
523 | mark_reg_pointer (reg) |
---|
524 | rtx reg; |
---|
525 | { |
---|
526 | REGNO_POINTER_FLAG (REGNO (reg)) = 1; |
---|
527 | } |
---|
528 | |
---|
529 | /* Return 1 plus largest pseudo reg number used in the current function. */ |
---|
530 | |
---|
531 | int |
---|
532 | max_reg_num () |
---|
533 | { |
---|
534 | return reg_rtx_no; |
---|
535 | } |
---|
536 | |
---|
537 | /* Return 1 + the largest label number used so far in the current function. */ |
---|
538 | |
---|
539 | int |
---|
540 | max_label_num () |
---|
541 | { |
---|
542 | if (last_label_num && label_num == base_label_num) |
---|
543 | return last_label_num; |
---|
544 | return label_num; |
---|
545 | } |
---|
546 | |
---|
547 | /* Return first label number used in this function (if any were used). */ |
---|
548 | |
---|
549 | int |
---|
550 | get_first_label_num () |
---|
551 | { |
---|
552 | return first_label_num; |
---|
553 | } |
---|
554 | |
---|
555 | /* Return a value representing some low-order bits of X, where the number |
---|
556 | of low-order bits is given by MODE. Note that no conversion is done |
---|
557 | between floating-point and fixed-point values, rather, the bit |
---|
558 | representation is returned. |
---|
559 | |
---|
560 | This function handles the cases in common between gen_lowpart, below, |
---|
561 | and two variants in cse.c and combine.c. These are the cases that can |
---|
562 | be safely handled at all points in the compilation. |
---|
563 | |
---|
564 | If this is not a case we can handle, return 0. */ |
---|
565 | |
---|
566 | rtx |
---|
567 | gen_lowpart_common (mode, x) |
---|
568 | enum machine_mode mode; |
---|
569 | register rtx x; |
---|
570 | { |
---|
571 | int word = 0; |
---|
572 | |
---|
573 | if (GET_MODE (x) == mode) |
---|
574 | return x; |
---|
575 | |
---|
576 | /* MODE must occupy no more words than the mode of X. */ |
---|
577 | if (GET_MODE (x) != VOIDmode |
---|
578 | && ((GET_MODE_SIZE (mode) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD |
---|
579 | > ((GET_MODE_SIZE (GET_MODE (x)) + (UNITS_PER_WORD - 1)) |
---|
580 | / UNITS_PER_WORD))) |
---|
581 | return 0; |
---|
582 | |
---|
583 | if (WORDS_BIG_ENDIAN && GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD) |
---|
584 | word = ((GET_MODE_SIZE (GET_MODE (x)) |
---|
585 | - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD)) |
---|
586 | / UNITS_PER_WORD); |
---|
587 | |
---|
588 | if ((GET_CODE (x) == ZERO_EXTEND || GET_CODE (x) == SIGN_EXTEND) |
---|
589 | && (GET_MODE_CLASS (mode) == MODE_INT |
---|
590 | || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)) |
---|
591 | { |
---|
592 | /* If we are getting the low-order part of something that has been |
---|
593 | sign- or zero-extended, we can either just use the object being |
---|
594 | extended or make a narrower extension. If we want an even smaller |
---|
595 | piece than the size of the object being extended, call ourselves |
---|
596 | recursively. |
---|
597 | |
---|
598 | This case is used mostly by combine and cse. */ |
---|
599 | |
---|
600 | if (GET_MODE (XEXP (x, 0)) == mode) |
---|
601 | return XEXP (x, 0); |
---|
602 | else if (GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (XEXP (x, 0)))) |
---|
603 | return gen_lowpart_common (mode, XEXP (x, 0)); |
---|
604 | else if (GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (x))) |
---|
605 | return gen_rtx (GET_CODE (x), mode, XEXP (x, 0)); |
---|
606 | } |
---|
607 | else if (GET_CODE (x) == SUBREG |
---|
608 | && (GET_MODE_SIZE (mode) <= UNITS_PER_WORD |
---|
609 | || GET_MODE_SIZE (mode) == GET_MODE_UNIT_SIZE (GET_MODE (x)))) |
---|
610 | return (GET_MODE (SUBREG_REG (x)) == mode && SUBREG_WORD (x) == 0 |
---|
611 | ? SUBREG_REG (x) |
---|
612 | : gen_rtx (SUBREG, mode, SUBREG_REG (x), SUBREG_WORD (x))); |
---|
613 | else if (GET_CODE (x) == REG) |
---|
614 | { |
---|
615 | /* If the register is not valid for MODE, return 0. If we don't |
---|
616 | do this, there is no way to fix up the resulting REG later. |
---|
617 | But we do do this if the current REG is not valid for its |
---|
618 | mode. This latter is a kludge, but is required due to the |
---|
619 | way that parameters are passed on some machines, most |
---|
620 | notably Sparc. */ |
---|
621 | if (REGNO (x) < FIRST_PSEUDO_REGISTER |
---|
622 | && ! HARD_REGNO_MODE_OK (REGNO (x) + word, mode) |
---|
623 | && HARD_REGNO_MODE_OK (REGNO (x), GET_MODE (x))) |
---|
624 | return 0; |
---|
625 | else if (REGNO (x) < FIRST_PSEUDO_REGISTER |
---|
626 | /* integrate.c can't handle parts of a return value register. */ |
---|
627 | && (! REG_FUNCTION_VALUE_P (x) |
---|
628 | || ! rtx_equal_function_value_matters) |
---|
629 | /* We want to keep the stack, frame, and arg pointers |
---|
630 | special. */ |
---|
631 | && x != frame_pointer_rtx |
---|
632 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
---|
633 | && x != arg_pointer_rtx |
---|
634 | #endif |
---|
635 | && x != stack_pointer_rtx) |
---|
636 | return gen_rtx (REG, mode, REGNO (x) + word); |
---|
637 | else |
---|
638 | return gen_rtx (SUBREG, mode, x, word); |
---|
639 | } |
---|
640 | /* If X is a CONST_INT or a CONST_DOUBLE, extract the appropriate bits |
---|
641 | from the low-order part of the constant. */ |
---|
642 | else if ((GET_MODE_CLASS (mode) == MODE_INT |
---|
643 | || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT) |
---|
644 | && GET_MODE (x) == VOIDmode |
---|
645 | && (GET_CODE (x) == CONST_INT || GET_CODE (x) == CONST_DOUBLE)) |
---|
646 | { |
---|
647 | /* If MODE is twice the host word size, X is already the desired |
---|
648 | representation. Otherwise, if MODE is wider than a word, we can't |
---|
649 | do this. If MODE is exactly a word, return just one CONST_INT. |
---|
650 | If MODE is smaller than a word, clear the bits that don't belong |
---|
651 | in our mode, unless they and our sign bit are all one. So we get |
---|
652 | either a reasonable negative value or a reasonable unsigned value |
---|
653 | for this mode. */ |
---|
654 | |
---|
655 | if (GET_MODE_BITSIZE (mode) >= 2 * HOST_BITS_PER_WIDE_INT) |
---|
656 | return x; |
---|
657 | else if (GET_MODE_BITSIZE (mode) > HOST_BITS_PER_WIDE_INT) |
---|
658 | return 0; |
---|
659 | else if (GET_MODE_BITSIZE (mode) == HOST_BITS_PER_WIDE_INT) |
---|
660 | return (GET_CODE (x) == CONST_INT ? x |
---|
661 | : GEN_INT (CONST_DOUBLE_LOW (x))); |
---|
662 | else |
---|
663 | { |
---|
664 | /* MODE must be narrower than HOST_BITS_PER_INT. */ |
---|
665 | int width = GET_MODE_BITSIZE (mode); |
---|
666 | HOST_WIDE_INT val = (GET_CODE (x) == CONST_INT ? INTVAL (x) |
---|
667 | : CONST_DOUBLE_LOW (x)); |
---|
668 | |
---|
669 | if (((val & ((HOST_WIDE_INT) (-1) << (width - 1))) |
---|
670 | != ((HOST_WIDE_INT) (-1) << (width - 1)))) |
---|
671 | val &= ((HOST_WIDE_INT) 1 << width) - 1; |
---|
672 | |
---|
673 | return (GET_CODE (x) == CONST_INT && INTVAL (x) == val ? x |
---|
674 | : GEN_INT (val)); |
---|
675 | } |
---|
676 | } |
---|
677 | |
---|
678 | /* If X is an integral constant but we want it in floating-point, it |
---|
679 | must be the case that we have a union of an integer and a floating-point |
---|
680 | value. If the machine-parameters allow it, simulate that union here |
---|
681 | and return the result. The two-word and single-word cases are |
---|
682 | different. */ |
---|
683 | |
---|
684 | else if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT |
---|
685 | && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD) |
---|
686 | || flag_pretend_float) |
---|
687 | && GET_MODE_CLASS (mode) == MODE_FLOAT |
---|
688 | && GET_MODE_SIZE (mode) == UNITS_PER_WORD |
---|
689 | && GET_CODE (x) == CONST_INT |
---|
690 | && sizeof (float) * HOST_BITS_PER_CHAR == HOST_BITS_PER_WIDE_INT) |
---|
691 | #ifdef REAL_ARITHMETIC |
---|
692 | { |
---|
693 | REAL_VALUE_TYPE r; |
---|
694 | HOST_WIDE_INT i; |
---|
695 | |
---|
696 | i = INTVAL (x); |
---|
697 | r = REAL_VALUE_FROM_TARGET_SINGLE (i); |
---|
698 | return CONST_DOUBLE_FROM_REAL_VALUE (r, mode); |
---|
699 | } |
---|
700 | #else |
---|
701 | { |
---|
702 | union {HOST_WIDE_INT i; float d; } u; |
---|
703 | |
---|
704 | u.i = INTVAL (x); |
---|
705 | return CONST_DOUBLE_FROM_REAL_VALUE (u.d, mode); |
---|
706 | } |
---|
707 | #endif |
---|
708 | else if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT |
---|
709 | && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD) |
---|
710 | || flag_pretend_float) |
---|
711 | && GET_MODE_CLASS (mode) == MODE_FLOAT |
---|
712 | && GET_MODE_SIZE (mode) == 2 * UNITS_PER_WORD |
---|
713 | && (GET_CODE (x) == CONST_INT || GET_CODE (x) == CONST_DOUBLE) |
---|
714 | && GET_MODE (x) == VOIDmode |
---|
715 | && (sizeof (double) * HOST_BITS_PER_CHAR |
---|
716 | == 2 * HOST_BITS_PER_WIDE_INT)) |
---|
717 | #ifdef REAL_ARITHMETIC |
---|
718 | { |
---|
719 | REAL_VALUE_TYPE r; |
---|
720 | HOST_WIDE_INT i[2]; |
---|
721 | HOST_WIDE_INT low, high; |
---|
722 | |
---|
723 | if (GET_CODE (x) == CONST_INT) |
---|
724 | low = INTVAL (x), high = low >> (HOST_BITS_PER_WIDE_INT -1); |
---|
725 | else |
---|
726 | low = CONST_DOUBLE_LOW (x), high = CONST_DOUBLE_HIGH (x); |
---|
727 | |
---|
728 | /* REAL_VALUE_TARGET_DOUBLE takes the addressing order of the |
---|
729 | target machine. */ |
---|
730 | if (WORDS_BIG_ENDIAN) |
---|
731 | i[0] = high, i[1] = low; |
---|
732 | else |
---|
733 | i[0] = low, i[1] = high; |
---|
734 | |
---|
735 | r = REAL_VALUE_FROM_TARGET_DOUBLE (i); |
---|
736 | return CONST_DOUBLE_FROM_REAL_VALUE (r, mode); |
---|
737 | } |
---|
738 | #else |
---|
739 | { |
---|
740 | union {HOST_WIDE_INT i[2]; double d; } u; |
---|
741 | HOST_WIDE_INT low, high; |
---|
742 | |
---|
743 | if (GET_CODE (x) == CONST_INT) |
---|
744 | low = INTVAL (x), high = low >> (HOST_BITS_PER_WIDE_INT -1); |
---|
745 | else |
---|
746 | low = CONST_DOUBLE_LOW (x), high = CONST_DOUBLE_HIGH (x); |
---|
747 | |
---|
748 | #ifdef HOST_WORDS_BIG_ENDIAN |
---|
749 | u.i[0] = high, u.i[1] = low; |
---|
750 | #else |
---|
751 | u.i[0] = low, u.i[1] = high; |
---|
752 | #endif |
---|
753 | |
---|
754 | return CONST_DOUBLE_FROM_REAL_VALUE (u.d, mode); |
---|
755 | } |
---|
756 | #endif |
---|
757 | /* Similarly, if this is converting a floating-point value into a |
---|
758 | single-word integer. Only do this is the host and target parameters are |
---|
759 | compatible. */ |
---|
760 | |
---|
761 | else if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT |
---|
762 | && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD) |
---|
763 | || flag_pretend_float) |
---|
764 | && (GET_MODE_CLASS (mode) == MODE_INT |
---|
765 | || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT) |
---|
766 | && GET_CODE (x) == CONST_DOUBLE |
---|
767 | && GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT |
---|
768 | && GET_MODE_BITSIZE (mode) == BITS_PER_WORD) |
---|
769 | return operand_subword (x, 0, 0, GET_MODE (x)); |
---|
770 | |
---|
771 | /* Similarly, if this is converting a floating-point value into a |
---|
772 | two-word integer, we can do this one word at a time and make an |
---|
773 | integer. Only do this is the host and target parameters are |
---|
774 | compatible. */ |
---|
775 | |
---|
776 | else if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT |
---|
777 | && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD) |
---|
778 | || flag_pretend_float) |
---|
779 | && (GET_MODE_CLASS (mode) == MODE_INT |
---|
780 | || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT) |
---|
781 | && GET_CODE (x) == CONST_DOUBLE |
---|
782 | && GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT |
---|
783 | && GET_MODE_BITSIZE (mode) == 2 * BITS_PER_WORD) |
---|
784 | { |
---|
785 | rtx lowpart = operand_subword (x, WORDS_BIG_ENDIAN, 0, GET_MODE (x)); |
---|
786 | rtx highpart = operand_subword (x, ! WORDS_BIG_ENDIAN, 0, GET_MODE (x)); |
---|
787 | |
---|
788 | if (lowpart && GET_CODE (lowpart) == CONST_INT |
---|
789 | && highpart && GET_CODE (highpart) == CONST_INT) |
---|
790 | return immed_double_const (INTVAL (lowpart), INTVAL (highpart), mode); |
---|
791 | } |
---|
792 | |
---|
793 | /* Otherwise, we can't do this. */ |
---|
794 | return 0; |
---|
795 | } |
---|
796 | |
---|
797 | /* Return the real part (which has mode MODE) of a complex value X. |
---|
798 | This always comes at the low address in memory. */ |
---|
799 | |
---|
800 | rtx |
---|
801 | gen_realpart (mode, x) |
---|
802 | enum machine_mode mode; |
---|
803 | register rtx x; |
---|
804 | { |
---|
805 | if (GET_CODE (x) == CONCAT && GET_MODE (XEXP (x, 0)) == mode) |
---|
806 | return XEXP (x, 0); |
---|
807 | else if (WORDS_BIG_ENDIAN) |
---|
808 | return gen_highpart (mode, x); |
---|
809 | else |
---|
810 | return gen_lowpart (mode, x); |
---|
811 | } |
---|
812 | |
---|
813 | /* Return the imaginary part (which has mode MODE) of a complex value X. |
---|
814 | This always comes at the high address in memory. */ |
---|
815 | |
---|
816 | rtx |
---|
817 | gen_imagpart (mode, x) |
---|
818 | enum machine_mode mode; |
---|
819 | register rtx x; |
---|
820 | { |
---|
821 | if (GET_CODE (x) == CONCAT && GET_MODE (XEXP (x, 0)) == mode) |
---|
822 | return XEXP (x, 1); |
---|
823 | else if (WORDS_BIG_ENDIAN) |
---|
824 | return gen_lowpart (mode, x); |
---|
825 | else |
---|
826 | return gen_highpart (mode, x); |
---|
827 | } |
---|
828 | |
---|
829 | /* Return 1 iff X, assumed to be a SUBREG, |
---|
830 | refers to the real part of the complex value in its containing reg. |
---|
831 | Complex values are always stored with the real part in the first word, |
---|
832 | regardless of WORDS_BIG_ENDIAN. */ |
---|
833 | |
---|
834 | int |
---|
835 | subreg_realpart_p (x) |
---|
836 | rtx x; |
---|
837 | { |
---|
838 | if (GET_CODE (x) != SUBREG) |
---|
839 | abort (); |
---|
840 | |
---|
841 | return SUBREG_WORD (x) == 0; |
---|
842 | } |
---|
843 | |
---|
844 | /* Assuming that X is an rtx (e.g., MEM, REG or SUBREG) for a value, |
---|
845 | return an rtx (MEM, SUBREG, or CONST_INT) that refers to the |
---|
846 | least-significant part of X. |
---|
847 | MODE specifies how big a part of X to return; |
---|
848 | it usually should not be larger than a word. |
---|
849 | If X is a MEM whose address is a QUEUED, the value may be so also. */ |
---|
850 | |
---|
851 | rtx |
---|
852 | gen_lowpart (mode, x) |
---|
853 | enum machine_mode mode; |
---|
854 | register rtx x; |
---|
855 | { |
---|
856 | rtx result = gen_lowpart_common (mode, x); |
---|
857 | |
---|
858 | if (result) |
---|
859 | return result; |
---|
860 | else if (GET_CODE (x) == REG) |
---|
861 | { |
---|
862 | /* Must be a hard reg that's not valid in MODE. */ |
---|
863 | result = gen_lowpart_common (mode, copy_to_reg (x)); |
---|
864 | if (result == 0) |
---|
865 | abort (); |
---|
866 | } |
---|
867 | else if (GET_CODE (x) == MEM) |
---|
868 | { |
---|
869 | /* The only additional case we can do is MEM. */ |
---|
870 | register int offset = 0; |
---|
871 | if (WORDS_BIG_ENDIAN) |
---|
872 | offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD) |
---|
873 | - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD)); |
---|
874 | |
---|
875 | if (BYTES_BIG_ENDIAN) |
---|
876 | /* Adjust the address so that the address-after-the-data |
---|
877 | is unchanged. */ |
---|
878 | offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode)) |
---|
879 | - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x)))); |
---|
880 | |
---|
881 | return change_address (x, mode, plus_constant (XEXP (x, 0), offset)); |
---|
882 | } |
---|
883 | else |
---|
884 | abort (); |
---|
885 | } |
---|
886 | |
---|
887 | /* Like `gen_lowpart', but refer to the most significant part. |
---|
888 | This is used to access the imaginary part of a complex number. */ |
---|
889 | |
---|
890 | rtx |
---|
891 | gen_highpart (mode, x) |
---|
892 | enum machine_mode mode; |
---|
893 | register rtx x; |
---|
894 | { |
---|
895 | /* This case loses if X is a subreg. To catch bugs early, |
---|
896 | complain if an invalid MODE is used even in other cases. */ |
---|
897 | if (GET_MODE_SIZE (mode) > UNITS_PER_WORD |
---|
898 | && GET_MODE_SIZE (mode) != GET_MODE_UNIT_SIZE (GET_MODE (x))) |
---|
899 | abort (); |
---|
900 | if (GET_CODE (x) == CONST_DOUBLE |
---|
901 | #if !(TARGET_FLOAT_FORMAT != HOST_FLOAT_FORMAT || defined (REAL_IS_NOT_DOUBLE)) |
---|
902 | && GET_MODE_CLASS (GET_MODE (x)) != MODE_FLOAT |
---|
903 | #endif |
---|
904 | ) |
---|
905 | return gen_rtx (CONST_INT, VOIDmode, |
---|
906 | CONST_DOUBLE_HIGH (x) & GET_MODE_MASK (mode)); |
---|
907 | else if (GET_CODE (x) == CONST_INT) |
---|
908 | return const0_rtx; |
---|
909 | else if (GET_CODE (x) == MEM) |
---|
910 | { |
---|
911 | register int offset = 0; |
---|
912 | if (! WORDS_BIG_ENDIAN) |
---|
913 | offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD) |
---|
914 | - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD)); |
---|
915 | |
---|
916 | if (! BYTES_BIG_ENDIAN |
---|
917 | && GET_MODE_SIZE (mode) < UNITS_PER_WORD) |
---|
918 | offset -= (GET_MODE_SIZE (mode) |
---|
919 | - MIN (UNITS_PER_WORD, |
---|
920 | GET_MODE_SIZE (GET_MODE (x)))); |
---|
921 | |
---|
922 | return change_address (x, mode, plus_constant (XEXP (x, 0), offset)); |
---|
923 | } |
---|
924 | else if (GET_CODE (x) == SUBREG) |
---|
925 | { |
---|
926 | /* The only time this should occur is when we are looking at a |
---|
927 | multi-word item with a SUBREG whose mode is the same as that of the |
---|
928 | item. It isn't clear what we would do if it wasn't. */ |
---|
929 | if (SUBREG_WORD (x) != 0) |
---|
930 | abort (); |
---|
931 | return gen_highpart (mode, SUBREG_REG (x)); |
---|
932 | } |
---|
933 | else if (GET_CODE (x) == REG) |
---|
934 | { |
---|
935 | int word = 0; |
---|
936 | |
---|
937 | if (! WORDS_BIG_ENDIAN |
---|
938 | && GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD) |
---|
939 | word = ((GET_MODE_SIZE (GET_MODE (x)) |
---|
940 | - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD)) |
---|
941 | / UNITS_PER_WORD); |
---|
942 | |
---|
943 | /* |
---|
944 | * ??? This fails miserably for complex values being passed in registers |
---|
945 | * where the sizeof the real and imaginary part are not equal to the |
---|
946 | * sizeof SImode. FIXME |
---|
947 | */ |
---|
948 | |
---|
949 | if (REGNO (x) < FIRST_PSEUDO_REGISTER |
---|
950 | /* integrate.c can't handle parts of a return value register. */ |
---|
951 | && (! REG_FUNCTION_VALUE_P (x) |
---|
952 | || ! rtx_equal_function_value_matters) |
---|
953 | /* We want to keep the stack, frame, and arg pointers special. */ |
---|
954 | && x != frame_pointer_rtx |
---|
955 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
---|
956 | && x != arg_pointer_rtx |
---|
957 | #endif |
---|
958 | && x != stack_pointer_rtx) |
---|
959 | return gen_rtx (REG, mode, REGNO (x) + word); |
---|
960 | else |
---|
961 | return gen_rtx (SUBREG, mode, x, word); |
---|
962 | } |
---|
963 | else |
---|
964 | abort (); |
---|
965 | } |
---|
966 | |
---|
967 | /* Return 1 iff X, assumed to be a SUBREG, |
---|
968 | refers to the least significant part of its containing reg. |
---|
969 | If X is not a SUBREG, always return 1 (it is its own low part!). */ |
---|
970 | |
---|
971 | int |
---|
972 | subreg_lowpart_p (x) |
---|
973 | rtx x; |
---|
974 | { |
---|
975 | if (GET_CODE (x) != SUBREG) |
---|
976 | return 1; |
---|
977 | |
---|
978 | if (WORDS_BIG_ENDIAN |
---|
979 | && GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) > UNITS_PER_WORD) |
---|
980 | return (SUBREG_WORD (x) |
---|
981 | == ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) |
---|
982 | - MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD)) |
---|
983 | / UNITS_PER_WORD)); |
---|
984 | |
---|
985 | return SUBREG_WORD (x) == 0; |
---|
986 | } |
---|
987 | |
---|
988 | /* Return subword I of operand OP. |
---|
989 | The word number, I, is interpreted as the word number starting at the |
---|
990 | low-order address. Word 0 is the low-order word if not WORDS_BIG_ENDIAN, |
---|
991 | otherwise it is the high-order word. |
---|
992 | |
---|
993 | If we cannot extract the required word, we return zero. Otherwise, an |
---|
994 | rtx corresponding to the requested word will be returned. |
---|
995 | |
---|
996 | VALIDATE_ADDRESS is nonzero if the address should be validated. Before |
---|
997 | reload has completed, a valid address will always be returned. After |
---|
998 | reload, if a valid address cannot be returned, we return zero. |
---|
999 | |
---|
1000 | If VALIDATE_ADDRESS is zero, we simply form the required address; validating |
---|
1001 | it is the responsibility of the caller. |
---|
1002 | |
---|
1003 | MODE is the mode of OP in case it is a CONST_INT. */ |
---|
1004 | |
---|
1005 | rtx |
---|
1006 | operand_subword (op, i, validate_address, mode) |
---|
1007 | rtx op; |
---|
1008 | int i; |
---|
1009 | int validate_address; |
---|
1010 | enum machine_mode mode; |
---|
1011 | { |
---|
1012 | HOST_WIDE_INT val; |
---|
1013 | int size_ratio = HOST_BITS_PER_WIDE_INT / BITS_PER_WORD; |
---|
1014 | |
---|
1015 | if (mode == VOIDmode) |
---|
1016 | mode = GET_MODE (op); |
---|
1017 | |
---|
1018 | if (mode == VOIDmode) |
---|
1019 | abort (); |
---|
1020 | |
---|
1021 | /* If OP is narrower than a word or if we want a word outside OP, fail. */ |
---|
1022 | if (mode != BLKmode |
---|
1023 | && (GET_MODE_SIZE (mode) < UNITS_PER_WORD |
---|
1024 | || (i + 1) * UNITS_PER_WORD > GET_MODE_SIZE (mode))) |
---|
1025 | return 0; |
---|
1026 | |
---|
1027 | /* If OP is already an integer word, return it. */ |
---|
1028 | if (GET_MODE_CLASS (mode) == MODE_INT |
---|
1029 | && GET_MODE_SIZE (mode) == UNITS_PER_WORD) |
---|
1030 | return op; |
---|
1031 | |
---|
1032 | /* If OP is a REG or SUBREG, we can handle it very simply. */ |
---|
1033 | if (GET_CODE (op) == REG) |
---|
1034 | { |
---|
1035 | /* If the register is not valid for MODE, return 0. If we don't |
---|
1036 | do this, there is no way to fix up the resulting REG later. */ |
---|
1037 | if (REGNO (op) < FIRST_PSEUDO_REGISTER |
---|
1038 | && ! HARD_REGNO_MODE_OK (REGNO (op) + i, word_mode)) |
---|
1039 | return 0; |
---|
1040 | else if (REGNO (op) >= FIRST_PSEUDO_REGISTER |
---|
1041 | || (REG_FUNCTION_VALUE_P (op) |
---|
1042 | && rtx_equal_function_value_matters) |
---|
1043 | /* We want to keep the stack, frame, and arg pointers |
---|
1044 | special. */ |
---|
1045 | || op == frame_pointer_rtx |
---|
1046 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
---|
1047 | || op == arg_pointer_rtx |
---|
1048 | #endif |
---|
1049 | || op == stack_pointer_rtx) |
---|
1050 | return gen_rtx (SUBREG, word_mode, op, i); |
---|
1051 | else |
---|
1052 | return gen_rtx (REG, word_mode, REGNO (op) + i); |
---|
1053 | } |
---|
1054 | else if (GET_CODE (op) == SUBREG) |
---|
1055 | return gen_rtx (SUBREG, word_mode, SUBREG_REG (op), i + SUBREG_WORD (op)); |
---|
1056 | else if (GET_CODE (op) == CONCAT) |
---|
1057 | { |
---|
1058 | int partwords = GET_MODE_UNIT_SIZE (GET_MODE (op)) / UNITS_PER_WORD; |
---|
1059 | if (i < partwords) |
---|
1060 | return operand_subword (XEXP (op, 0), i, validate_address, mode); |
---|
1061 | return operand_subword (XEXP (op, 1), i - partwords, |
---|
1062 | validate_address, mode); |
---|
1063 | } |
---|
1064 | |
---|
1065 | /* Form a new MEM at the requested address. */ |
---|
1066 | if (GET_CODE (op) == MEM) |
---|
1067 | { |
---|
1068 | rtx addr = plus_constant (XEXP (op, 0), i * UNITS_PER_WORD); |
---|
1069 | rtx new; |
---|
1070 | |
---|
1071 | if (validate_address) |
---|
1072 | { |
---|
1073 | if (reload_completed) |
---|
1074 | { |
---|
1075 | if (! strict_memory_address_p (word_mode, addr)) |
---|
1076 | return 0; |
---|
1077 | } |
---|
1078 | else |
---|
1079 | addr = memory_address (word_mode, addr); |
---|
1080 | } |
---|
1081 | |
---|
1082 | new = gen_rtx (MEM, word_mode, addr); |
---|
1083 | |
---|
1084 | MEM_VOLATILE_P (new) = MEM_VOLATILE_P (op); |
---|
1085 | MEM_IN_STRUCT_P (new) = MEM_IN_STRUCT_P (op); |
---|
1086 | RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (op); |
---|
1087 | |
---|
1088 | return new; |
---|
1089 | } |
---|
1090 | |
---|
1091 | /* The only remaining cases are when OP is a constant. If the host and |
---|
1092 | target floating formats are the same, handling two-word floating |
---|
1093 | constants are easy. Note that REAL_VALUE_TO_TARGET_{SINGLE,DOUBLE} |
---|
1094 | are defined as returning one or two 32 bit values, respectively, |
---|
1095 | and not values of BITS_PER_WORD bits. */ |
---|
1096 | #ifdef REAL_ARITHMETIC |
---|
1097 | /* The output is some bits, the width of the target machine's word. |
---|
1098 | A wider-word host can surely hold them in a CONST_INT. A narrower-word |
---|
1099 | host can't. */ |
---|
1100 | if (HOST_BITS_PER_WIDE_INT >= BITS_PER_WORD |
---|
1101 | && GET_MODE_CLASS (mode) == MODE_FLOAT |
---|
1102 | && GET_MODE_BITSIZE (mode) == 64 |
---|
1103 | && GET_CODE (op) == CONST_DOUBLE) |
---|
1104 | { |
---|
1105 | long k[2]; |
---|
1106 | REAL_VALUE_TYPE rv; |
---|
1107 | |
---|
1108 | REAL_VALUE_FROM_CONST_DOUBLE (rv, op); |
---|
1109 | REAL_VALUE_TO_TARGET_DOUBLE (rv, k); |
---|
1110 | |
---|
1111 | /* We handle 32-bit and >= 64-bit words here. Note that the order in |
---|
1112 | which the words are written depends on the word endianness. |
---|
1113 | |
---|
1114 | ??? This is a potential portability problem and should |
---|
1115 | be fixed at some point. */ |
---|
1116 | if (BITS_PER_WORD == 32) |
---|
1117 | return GEN_INT ((HOST_WIDE_INT) k[i]); |
---|
1118 | #if HOST_BITS_PER_WIDE_INT > 32 |
---|
1119 | else if (BITS_PER_WORD >= 64 && i == 0) |
---|
1120 | return GEN_INT ((((HOST_WIDE_INT) k[! WORDS_BIG_ENDIAN]) << 32) |
---|
1121 | | (HOST_WIDE_INT) k[WORDS_BIG_ENDIAN]); |
---|
1122 | #endif |
---|
1123 | else if (BITS_PER_WORD == 16) |
---|
1124 | { |
---|
1125 | long value; |
---|
1126 | value = k[i >> 1]; |
---|
1127 | if ((i & 0x1) == 0) |
---|
1128 | value >>= 16; |
---|
1129 | value &= 0xffff; |
---|
1130 | return GEN_INT ((HOST_WIDE_INT) value); |
---|
1131 | } |
---|
1132 | else |
---|
1133 | abort (); |
---|
1134 | } |
---|
1135 | #else /* no REAL_ARITHMETIC */ |
---|
1136 | if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT |
---|
1137 | && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD) |
---|
1138 | || flag_pretend_float) |
---|
1139 | && GET_MODE_CLASS (mode) == MODE_FLOAT |
---|
1140 | && GET_MODE_SIZE (mode) == 2 * UNITS_PER_WORD |
---|
1141 | && GET_CODE (op) == CONST_DOUBLE) |
---|
1142 | { |
---|
1143 | /* The constant is stored in the host's word-ordering, |
---|
1144 | but we want to access it in the target's word-ordering. Some |
---|
1145 | compilers don't like a conditional inside macro args, so we have two |
---|
1146 | copies of the return. */ |
---|
1147 | #ifdef HOST_WORDS_BIG_ENDIAN |
---|
1148 | return GEN_INT (i == WORDS_BIG_ENDIAN |
---|
1149 | ? CONST_DOUBLE_HIGH (op) : CONST_DOUBLE_LOW (op)); |
---|
1150 | #else |
---|
1151 | return GEN_INT (i != WORDS_BIG_ENDIAN |
---|
1152 | ? CONST_DOUBLE_HIGH (op) : CONST_DOUBLE_LOW (op)); |
---|
1153 | #endif |
---|
1154 | } |
---|
1155 | #endif /* no REAL_ARITHMETIC */ |
---|
1156 | |
---|
1157 | /* Single word float is a little harder, since single- and double-word |
---|
1158 | values often do not have the same high-order bits. We have already |
---|
1159 | verified that we want the only defined word of the single-word value. */ |
---|
1160 | #ifdef REAL_ARITHMETIC |
---|
1161 | if (GET_MODE_CLASS (mode) == MODE_FLOAT |
---|
1162 | && GET_MODE_BITSIZE (mode) == 32 |
---|
1163 | && GET_CODE (op) == CONST_DOUBLE) |
---|
1164 | { |
---|
1165 | long l; |
---|
1166 | REAL_VALUE_TYPE rv; |
---|
1167 | |
---|
1168 | REAL_VALUE_FROM_CONST_DOUBLE (rv, op); |
---|
1169 | REAL_VALUE_TO_TARGET_SINGLE (rv, l); |
---|
1170 | return GEN_INT ((HOST_WIDE_INT) l); |
---|
1171 | } |
---|
1172 | #else |
---|
1173 | if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT |
---|
1174 | && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD) |
---|
1175 | || flag_pretend_float) |
---|
1176 | && GET_MODE_CLASS (mode) == MODE_FLOAT |
---|
1177 | && GET_MODE_SIZE (mode) == UNITS_PER_WORD |
---|
1178 | && GET_CODE (op) == CONST_DOUBLE) |
---|
1179 | { |
---|
1180 | double d; |
---|
1181 | union {float f; HOST_WIDE_INT i; } u; |
---|
1182 | |
---|
1183 | REAL_VALUE_FROM_CONST_DOUBLE (d, op); |
---|
1184 | |
---|
1185 | u.f = d; |
---|
1186 | return GEN_INT (u.i); |
---|
1187 | } |
---|
1188 | #endif /* no REAL_ARITHMETIC */ |
---|
1189 | |
---|
1190 | /* The only remaining cases that we can handle are integers. |
---|
1191 | Convert to proper endianness now since these cases need it. |
---|
1192 | At this point, i == 0 means the low-order word. |
---|
1193 | |
---|
1194 | We do not want to handle the case when BITS_PER_WORD <= HOST_BITS_PER_INT |
---|
1195 | in general. However, if OP is (const_int 0), we can just return |
---|
1196 | it for any word. */ |
---|
1197 | |
---|
1198 | if (op == const0_rtx) |
---|
1199 | return op; |
---|
1200 | |
---|
1201 | if (GET_MODE_CLASS (mode) != MODE_INT |
---|
1202 | || (GET_CODE (op) != CONST_INT && GET_CODE (op) != CONST_DOUBLE) |
---|
1203 | || BITS_PER_WORD > HOST_BITS_PER_WIDE_INT) |
---|
1204 | return 0; |
---|
1205 | |
---|
1206 | if (WORDS_BIG_ENDIAN) |
---|
1207 | i = GET_MODE_SIZE (mode) / UNITS_PER_WORD - 1 - i; |
---|
1208 | |
---|
1209 | /* Find out which word on the host machine this value is in and get |
---|
1210 | it from the constant. */ |
---|
1211 | val = (i / size_ratio == 0 |
---|
1212 | ? (GET_CODE (op) == CONST_INT ? INTVAL (op) : CONST_DOUBLE_LOW (op)) |
---|
1213 | : (GET_CODE (op) == CONST_INT |
---|
1214 | ? (INTVAL (op) < 0 ? ~0 : 0) : CONST_DOUBLE_HIGH (op))); |
---|
1215 | |
---|
1216 | /* If BITS_PER_WORD is smaller than an int, get the appropriate bits. */ |
---|
1217 | if (BITS_PER_WORD < HOST_BITS_PER_WIDE_INT) |
---|
1218 | val = ((val >> ((i % size_ratio) * BITS_PER_WORD)) |
---|
1219 | & (((HOST_WIDE_INT) 1 |
---|
1220 | << (BITS_PER_WORD % HOST_BITS_PER_WIDE_INT)) - 1)); |
---|
1221 | |
---|
1222 | return GEN_INT (val); |
---|
1223 | } |
---|
1224 | |
---|
1225 | /* Similar to `operand_subword', but never return 0. If we can't extract |
---|
1226 | the required subword, put OP into a register and try again. If that fails, |
---|
1227 | abort. We always validate the address in this case. It is not valid |
---|
1228 | to call this function after reload; it is mostly meant for RTL |
---|
1229 | generation. |
---|
1230 | |
---|
1231 | MODE is the mode of OP, in case it is CONST_INT. */ |
---|
1232 | |
---|
1233 | rtx |
---|
1234 | operand_subword_force (op, i, mode) |
---|
1235 | rtx op; |
---|
1236 | int i; |
---|
1237 | enum machine_mode mode; |
---|
1238 | { |
---|
1239 | rtx result = operand_subword (op, i, 1, mode); |
---|
1240 | |
---|
1241 | if (result) |
---|
1242 | return result; |
---|
1243 | |
---|
1244 | if (mode != BLKmode && mode != VOIDmode) |
---|
1245 | op = force_reg (mode, op); |
---|
1246 | |
---|
1247 | result = operand_subword (op, i, 1, mode); |
---|
1248 | if (result == 0) |
---|
1249 | abort (); |
---|
1250 | |
---|
1251 | return result; |
---|
1252 | } |
---|
1253 | |
---|
1254 | /* Given a compare instruction, swap the operands. |
---|
1255 | A test instruction is changed into a compare of 0 against the operand. */ |
---|
1256 | |
---|
1257 | void |
---|
1258 | reverse_comparison (insn) |
---|
1259 | rtx insn; |
---|
1260 | { |
---|
1261 | rtx body = PATTERN (insn); |
---|
1262 | rtx comp; |
---|
1263 | |
---|
1264 | if (GET_CODE (body) == SET) |
---|
1265 | comp = SET_SRC (body); |
---|
1266 | else |
---|
1267 | comp = SET_SRC (XVECEXP (body, 0, 0)); |
---|
1268 | |
---|
1269 | if (GET_CODE (comp) == COMPARE) |
---|
1270 | { |
---|
1271 | rtx op0 = XEXP (comp, 0); |
---|
1272 | rtx op1 = XEXP (comp, 1); |
---|
1273 | XEXP (comp, 0) = op1; |
---|
1274 | XEXP (comp, 1) = op0; |
---|
1275 | } |
---|
1276 | else |
---|
1277 | { |
---|
1278 | rtx new = gen_rtx (COMPARE, VOIDmode, |
---|
1279 | CONST0_RTX (GET_MODE (comp)), comp); |
---|
1280 | if (GET_CODE (body) == SET) |
---|
1281 | SET_SRC (body) = new; |
---|
1282 | else |
---|
1283 | SET_SRC (XVECEXP (body, 0, 0)) = new; |
---|
1284 | } |
---|
1285 | } |
---|
1286 | |
---|
1287 | /* Return a memory reference like MEMREF, but with its mode changed |
---|
1288 | to MODE and its address changed to ADDR. |
---|
1289 | (VOIDmode means don't change the mode. |
---|
1290 | NULL for ADDR means don't change the address.) */ |
---|
1291 | |
---|
1292 | rtx |
---|
1293 | change_address (memref, mode, addr) |
---|
1294 | rtx memref; |
---|
1295 | enum machine_mode mode; |
---|
1296 | rtx addr; |
---|
1297 | { |
---|
1298 | rtx new; |
---|
1299 | |
---|
1300 | if (GET_CODE (memref) != MEM) |
---|
1301 | abort (); |
---|
1302 | if (mode == VOIDmode) |
---|
1303 | mode = GET_MODE (memref); |
---|
1304 | if (addr == 0) |
---|
1305 | addr = XEXP (memref, 0); |
---|
1306 | |
---|
1307 | /* If reload is in progress or has completed, ADDR must be valid. |
---|
1308 | Otherwise, we can call memory_address to make it valid. */ |
---|
1309 | if (reload_completed || reload_in_progress) |
---|
1310 | { |
---|
1311 | if (! memory_address_p (mode, addr)) |
---|
1312 | abort (); |
---|
1313 | } |
---|
1314 | else |
---|
1315 | addr = memory_address (mode, addr); |
---|
1316 | |
---|
1317 | new = gen_rtx (MEM, mode, addr); |
---|
1318 | MEM_VOLATILE_P (new) = MEM_VOLATILE_P (memref); |
---|
1319 | RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (memref); |
---|
1320 | MEM_IN_STRUCT_P (new) = MEM_IN_STRUCT_P (memref); |
---|
1321 | return new; |
---|
1322 | } |
---|
1323 | |
---|
1324 | /* Return a newly created CODE_LABEL rtx with a unique label number. */ |
---|
1325 | |
---|
1326 | rtx |
---|
1327 | gen_label_rtx () |
---|
1328 | { |
---|
1329 | register rtx label; |
---|
1330 | |
---|
1331 | label = (output_bytecode |
---|
1332 | ? gen_rtx (CODE_LABEL, VOIDmode, NULL, bc_get_bytecode_label ()) |
---|
1333 | : gen_rtx (CODE_LABEL, VOIDmode, 0, 0, 0, label_num++, NULL_PTR)); |
---|
1334 | |
---|
1335 | LABEL_NUSES (label) = 0; |
---|
1336 | return label; |
---|
1337 | } |
---|
1338 | |
---|
1339 | /* For procedure integration. */ |
---|
1340 | |
---|
1341 | /* Return a newly created INLINE_HEADER rtx. Should allocate this |
---|
1342 | from a permanent obstack when the opportunity arises. */ |
---|
1343 | |
---|
1344 | rtx |
---|
1345 | gen_inline_header_rtx (first_insn, first_parm_insn, first_labelno, |
---|
1346 | last_labelno, max_parm_regnum, max_regnum, args_size, |
---|
1347 | pops_args, stack_slots, forced_labels, function_flags, |
---|
1348 | outgoing_args_size, original_arg_vector, |
---|
1349 | original_decl_initial) |
---|
1350 | rtx first_insn, first_parm_insn; |
---|
1351 | int first_labelno, last_labelno, max_parm_regnum, max_regnum, args_size; |
---|
1352 | int pops_args; |
---|
1353 | rtx stack_slots; |
---|
1354 | rtx forced_labels; |
---|
1355 | int function_flags; |
---|
1356 | int outgoing_args_size; |
---|
1357 | rtvec original_arg_vector; |
---|
1358 | rtx original_decl_initial; |
---|
1359 | { |
---|
1360 | rtx header = gen_rtx (INLINE_HEADER, VOIDmode, |
---|
1361 | cur_insn_uid++, NULL_RTX, |
---|
1362 | first_insn, first_parm_insn, |
---|
1363 | first_labelno, last_labelno, |
---|
1364 | max_parm_regnum, max_regnum, args_size, pops_args, |
---|
1365 | stack_slots, forced_labels, function_flags, |
---|
1366 | outgoing_args_size, |
---|
1367 | original_arg_vector, original_decl_initial); |
---|
1368 | return header; |
---|
1369 | } |
---|
1370 | |
---|
1371 | /* Install new pointers to the first and last insns in the chain. |
---|
1372 | Used for an inline-procedure after copying the insn chain. */ |
---|
1373 | |
---|
1374 | void |
---|
1375 | set_new_first_and_last_insn (first, last) |
---|
1376 | rtx first, last; |
---|
1377 | { |
---|
1378 | first_insn = first; |
---|
1379 | last_insn = last; |
---|
1380 | } |
---|
1381 | |
---|
1382 | /* Set the range of label numbers found in the current function. |
---|
1383 | This is used when belatedly compiling an inline function. */ |
---|
1384 | |
---|
1385 | void |
---|
1386 | set_new_first_and_last_label_num (first, last) |
---|
1387 | int first, last; |
---|
1388 | { |
---|
1389 | base_label_num = label_num; |
---|
1390 | first_label_num = first; |
---|
1391 | last_label_num = last; |
---|
1392 | } |
---|
1393 | |
---|
1394 | /* Save all variables describing the current status into the structure *P. |
---|
1395 | This is used before starting a nested function. */ |
---|
1396 | |
---|
1397 | void |
---|
1398 | save_emit_status (p) |
---|
1399 | struct function *p; |
---|
1400 | { |
---|
1401 | p->reg_rtx_no = reg_rtx_no; |
---|
1402 | p->first_label_num = first_label_num; |
---|
1403 | p->first_insn = first_insn; |
---|
1404 | p->last_insn = last_insn; |
---|
1405 | p->sequence_rtl_expr = sequence_rtl_expr; |
---|
1406 | p->sequence_stack = sequence_stack; |
---|
1407 | p->cur_insn_uid = cur_insn_uid; |
---|
1408 | p->last_linenum = last_linenum; |
---|
1409 | p->last_filename = last_filename; |
---|
1410 | p->regno_pointer_flag = regno_pointer_flag; |
---|
1411 | p->regno_pointer_flag_length = regno_pointer_flag_length; |
---|
1412 | p->regno_reg_rtx = regno_reg_rtx; |
---|
1413 | } |
---|
1414 | |
---|
1415 | /* Restore all variables describing the current status from the structure *P. |
---|
1416 | This is used after a nested function. */ |
---|
1417 | |
---|
1418 | void |
---|
1419 | restore_emit_status (p) |
---|
1420 | struct function *p; |
---|
1421 | { |
---|
1422 | int i; |
---|
1423 | |
---|
1424 | reg_rtx_no = p->reg_rtx_no; |
---|
1425 | first_label_num = p->first_label_num; |
---|
1426 | last_label_num = 0; |
---|
1427 | first_insn = p->first_insn; |
---|
1428 | last_insn = p->last_insn; |
---|
1429 | sequence_rtl_expr = p->sequence_rtl_expr; |
---|
1430 | sequence_stack = p->sequence_stack; |
---|
1431 | cur_insn_uid = p->cur_insn_uid; |
---|
1432 | last_linenum = p->last_linenum; |
---|
1433 | last_filename = p->last_filename; |
---|
1434 | regno_pointer_flag = p->regno_pointer_flag; |
---|
1435 | regno_pointer_flag_length = p->regno_pointer_flag_length; |
---|
1436 | regno_reg_rtx = p->regno_reg_rtx; |
---|
1437 | |
---|
1438 | /* Clear our cache of rtx expressions for start_sequence and gen_sequence. */ |
---|
1439 | sequence_element_free_list = 0; |
---|
1440 | for (i = 0; i < SEQUENCE_RESULT_SIZE; i++) |
---|
1441 | sequence_result[i] = 0; |
---|
1442 | } |
---|
1443 | |
---|
1444 | /* Go through all the RTL insn bodies and copy any invalid shared structure. |
---|
1445 | It does not work to do this twice, because the mark bits set here |
---|
1446 | are not cleared afterwards. */ |
---|
1447 | |
---|
1448 | void |
---|
1449 | unshare_all_rtl (insn) |
---|
1450 | register rtx insn; |
---|
1451 | { |
---|
1452 | for (; insn; insn = NEXT_INSN (insn)) |
---|
1453 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN |
---|
1454 | || GET_CODE (insn) == CALL_INSN) |
---|
1455 | { |
---|
1456 | PATTERN (insn) = copy_rtx_if_shared (PATTERN (insn)); |
---|
1457 | REG_NOTES (insn) = copy_rtx_if_shared (REG_NOTES (insn)); |
---|
1458 | LOG_LINKS (insn) = copy_rtx_if_shared (LOG_LINKS (insn)); |
---|
1459 | } |
---|
1460 | |
---|
1461 | /* Make sure the addresses of stack slots found outside the insn chain |
---|
1462 | (such as, in DECL_RTL of a variable) are not shared |
---|
1463 | with the insn chain. |
---|
1464 | |
---|
1465 | This special care is necessary when the stack slot MEM does not |
---|
1466 | actually appear in the insn chain. If it does appear, its address |
---|
1467 | is unshared from all else at that point. */ |
---|
1468 | |
---|
1469 | copy_rtx_if_shared (stack_slot_list); |
---|
1470 | } |
---|
1471 | |
---|
1472 | /* Mark ORIG as in use, and return a copy of it if it was already in use. |
---|
1473 | Recursively does the same for subexpressions. */ |
---|
1474 | |
---|
1475 | rtx |
---|
1476 | copy_rtx_if_shared (orig) |
---|
1477 | rtx orig; |
---|
1478 | { |
---|
1479 | register rtx x = orig; |
---|
1480 | register int i; |
---|
1481 | register enum rtx_code code; |
---|
1482 | register char *format_ptr; |
---|
1483 | int copied = 0; |
---|
1484 | |
---|
1485 | if (x == 0) |
---|
1486 | return 0; |
---|
1487 | |
---|
1488 | code = GET_CODE (x); |
---|
1489 | |
---|
1490 | /* These types may be freely shared. */ |
---|
1491 | |
---|
1492 | switch (code) |
---|
1493 | { |
---|
1494 | case REG: |
---|
1495 | case QUEUED: |
---|
1496 | case CONST_INT: |
---|
1497 | case CONST_DOUBLE: |
---|
1498 | case SYMBOL_REF: |
---|
1499 | case CODE_LABEL: |
---|
1500 | case PC: |
---|
1501 | case CC0: |
---|
1502 | case SCRATCH: |
---|
1503 | /* SCRATCH must be shared because they represent distinct values. */ |
---|
1504 | return x; |
---|
1505 | |
---|
1506 | case CONST: |
---|
1507 | /* CONST can be shared if it contains a SYMBOL_REF. If it contains |
---|
1508 | a LABEL_REF, it isn't sharable. */ |
---|
1509 | if (GET_CODE (XEXP (x, 0)) == PLUS |
---|
1510 | && GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF |
---|
1511 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT) |
---|
1512 | return x; |
---|
1513 | break; |
---|
1514 | |
---|
1515 | case INSN: |
---|
1516 | case JUMP_INSN: |
---|
1517 | case CALL_INSN: |
---|
1518 | case NOTE: |
---|
1519 | case BARRIER: |
---|
1520 | /* The chain of insns is not being copied. */ |
---|
1521 | return x; |
---|
1522 | |
---|
1523 | case MEM: |
---|
1524 | /* A MEM is allowed to be shared if its address is constant |
---|
1525 | or is a constant plus one of the special registers. */ |
---|
1526 | if (CONSTANT_ADDRESS_P (XEXP (x, 0)) |
---|
1527 | || XEXP (x, 0) == virtual_stack_vars_rtx |
---|
1528 | || XEXP (x, 0) == virtual_incoming_args_rtx) |
---|
1529 | return x; |
---|
1530 | |
---|
1531 | if (GET_CODE (XEXP (x, 0)) == PLUS |
---|
1532 | && (XEXP (XEXP (x, 0), 0) == virtual_stack_vars_rtx |
---|
1533 | || XEXP (XEXP (x, 0), 0) == virtual_incoming_args_rtx) |
---|
1534 | && CONSTANT_ADDRESS_P (XEXP (XEXP (x, 0), 1))) |
---|
1535 | { |
---|
1536 | /* This MEM can appear in more than one place, |
---|
1537 | but its address better not be shared with anything else. */ |
---|
1538 | if (! x->used) |
---|
1539 | XEXP (x, 0) = copy_rtx_if_shared (XEXP (x, 0)); |
---|
1540 | x->used = 1; |
---|
1541 | return x; |
---|
1542 | } |
---|
1543 | } |
---|
1544 | |
---|
1545 | /* This rtx may not be shared. If it has already been seen, |
---|
1546 | replace it with a copy of itself. */ |
---|
1547 | |
---|
1548 | if (x->used) |
---|
1549 | { |
---|
1550 | register rtx copy; |
---|
1551 | |
---|
1552 | copy = rtx_alloc (code); |
---|
1553 | bcopy ((char *) x, (char *) copy, |
---|
1554 | (sizeof (*copy) - sizeof (copy->fld) |
---|
1555 | + sizeof (copy->fld[0]) * GET_RTX_LENGTH (code))); |
---|
1556 | x = copy; |
---|
1557 | copied = 1; |
---|
1558 | } |
---|
1559 | x->used = 1; |
---|
1560 | |
---|
1561 | /* Now scan the subexpressions recursively. |
---|
1562 | We can store any replaced subexpressions directly into X |
---|
1563 | since we know X is not shared! Any vectors in X |
---|
1564 | must be copied if X was copied. */ |
---|
1565 | |
---|
1566 | format_ptr = GET_RTX_FORMAT (code); |
---|
1567 | |
---|
1568 | for (i = 0; i < GET_RTX_LENGTH (code); i++) |
---|
1569 | { |
---|
1570 | switch (*format_ptr++) |
---|
1571 | { |
---|
1572 | case 'e': |
---|
1573 | XEXP (x, i) = copy_rtx_if_shared (XEXP (x, i)); |
---|
1574 | break; |
---|
1575 | |
---|
1576 | case 'E': |
---|
1577 | if (XVEC (x, i) != NULL) |
---|
1578 | { |
---|
1579 | register int j; |
---|
1580 | int len = XVECLEN (x, i); |
---|
1581 | |
---|
1582 | if (copied && len > 0) |
---|
1583 | XVEC (x, i) = gen_rtvec_v (len, &XVECEXP (x, i, 0)); |
---|
1584 | for (j = 0; j < len; j++) |
---|
1585 | XVECEXP (x, i, j) = copy_rtx_if_shared (XVECEXP (x, i, j)); |
---|
1586 | } |
---|
1587 | break; |
---|
1588 | } |
---|
1589 | } |
---|
1590 | return x; |
---|
1591 | } |
---|
1592 | |
---|
1593 | /* Clear all the USED bits in X to allow copy_rtx_if_shared to be used |
---|
1594 | to look for shared sub-parts. */ |
---|
1595 | |
---|
1596 | void |
---|
1597 | reset_used_flags (x) |
---|
1598 | rtx x; |
---|
1599 | { |
---|
1600 | register int i, j; |
---|
1601 | register enum rtx_code code; |
---|
1602 | register char *format_ptr; |
---|
1603 | |
---|
1604 | if (x == 0) |
---|
1605 | return; |
---|
1606 | |
---|
1607 | code = GET_CODE (x); |
---|
1608 | |
---|
1609 | /* These types may be freely shared so we needn't do any resetting |
---|
1610 | for them. */ |
---|
1611 | |
---|
1612 | switch (code) |
---|
1613 | { |
---|
1614 | case REG: |
---|
1615 | case QUEUED: |
---|
1616 | case CONST_INT: |
---|
1617 | case CONST_DOUBLE: |
---|
1618 | case SYMBOL_REF: |
---|
1619 | case CODE_LABEL: |
---|
1620 | case PC: |
---|
1621 | case CC0: |
---|
1622 | return; |
---|
1623 | |
---|
1624 | case INSN: |
---|
1625 | case JUMP_INSN: |
---|
1626 | case CALL_INSN: |
---|
1627 | case NOTE: |
---|
1628 | case LABEL_REF: |
---|
1629 | case BARRIER: |
---|
1630 | /* The chain of insns is not being copied. */ |
---|
1631 | return; |
---|
1632 | } |
---|
1633 | |
---|
1634 | x->used = 0; |
---|
1635 | |
---|
1636 | format_ptr = GET_RTX_FORMAT (code); |
---|
1637 | for (i = 0; i < GET_RTX_LENGTH (code); i++) |
---|
1638 | { |
---|
1639 | switch (*format_ptr++) |
---|
1640 | { |
---|
1641 | case 'e': |
---|
1642 | reset_used_flags (XEXP (x, i)); |
---|
1643 | break; |
---|
1644 | |
---|
1645 | case 'E': |
---|
1646 | for (j = 0; j < XVECLEN (x, i); j++) |
---|
1647 | reset_used_flags (XVECEXP (x, i, j)); |
---|
1648 | break; |
---|
1649 | } |
---|
1650 | } |
---|
1651 | } |
---|
1652 | |
---|
1653 | /* Copy X if necessary so that it won't be altered by changes in OTHER. |
---|
1654 | Return X or the rtx for the pseudo reg the value of X was copied into. |
---|
1655 | OTHER must be valid as a SET_DEST. */ |
---|
1656 | |
---|
1657 | rtx |
---|
1658 | make_safe_from (x, other) |
---|
1659 | rtx x, other; |
---|
1660 | { |
---|
1661 | while (1) |
---|
1662 | switch (GET_CODE (other)) |
---|
1663 | { |
---|
1664 | case SUBREG: |
---|
1665 | other = SUBREG_REG (other); |
---|
1666 | break; |
---|
1667 | case STRICT_LOW_PART: |
---|
1668 | case SIGN_EXTEND: |
---|
1669 | case ZERO_EXTEND: |
---|
1670 | other = XEXP (other, 0); |
---|
1671 | break; |
---|
1672 | default: |
---|
1673 | goto done; |
---|
1674 | } |
---|
1675 | done: |
---|
1676 | if ((GET_CODE (other) == MEM |
---|
1677 | && ! CONSTANT_P (x) |
---|
1678 | && GET_CODE (x) != REG |
---|
1679 | && GET_CODE (x) != SUBREG) |
---|
1680 | || (GET_CODE (other) == REG |
---|
1681 | && (REGNO (other) < FIRST_PSEUDO_REGISTER |
---|
1682 | || reg_mentioned_p (other, x)))) |
---|
1683 | { |
---|
1684 | rtx temp = gen_reg_rtx (GET_MODE (x)); |
---|
1685 | emit_move_insn (temp, x); |
---|
1686 | return temp; |
---|
1687 | } |
---|
1688 | return x; |
---|
1689 | } |
---|
1690 | |
---|
1691 | /* Emission of insns (adding them to the doubly-linked list). */ |
---|
1692 | |
---|
1693 | /* Return the first insn of the current sequence or current function. */ |
---|
1694 | |
---|
1695 | rtx |
---|
1696 | get_insns () |
---|
1697 | { |
---|
1698 | return first_insn; |
---|
1699 | } |
---|
1700 | |
---|
1701 | /* Return the last insn emitted in current sequence or current function. */ |
---|
1702 | |
---|
1703 | rtx |
---|
1704 | get_last_insn () |
---|
1705 | { |
---|
1706 | return last_insn; |
---|
1707 | } |
---|
1708 | |
---|
1709 | /* Specify a new insn as the last in the chain. */ |
---|
1710 | |
---|
1711 | void |
---|
1712 | set_last_insn (insn) |
---|
1713 | rtx insn; |
---|
1714 | { |
---|
1715 | if (NEXT_INSN (insn) != 0) |
---|
1716 | abort (); |
---|
1717 | last_insn = insn; |
---|
1718 | } |
---|
1719 | |
---|
1720 | /* Return the last insn emitted, even if it is in a sequence now pushed. */ |
---|
1721 | |
---|
1722 | rtx |
---|
1723 | get_last_insn_anywhere () |
---|
1724 | { |
---|
1725 | struct sequence_stack *stack; |
---|
1726 | if (last_insn) |
---|
1727 | return last_insn; |
---|
1728 | for (stack = sequence_stack; stack; stack = stack->next) |
---|
1729 | if (stack->last != 0) |
---|
1730 | return stack->last; |
---|
1731 | return 0; |
---|
1732 | } |
---|
1733 | |
---|
1734 | /* Return a number larger than any instruction's uid in this function. */ |
---|
1735 | |
---|
1736 | int |
---|
1737 | get_max_uid () |
---|
1738 | { |
---|
1739 | return cur_insn_uid; |
---|
1740 | } |
---|
1741 | |
---|
1742 | /* Return the next insn. If it is a SEQUENCE, return the first insn |
---|
1743 | of the sequence. */ |
---|
1744 | |
---|
1745 | rtx |
---|
1746 | next_insn (insn) |
---|
1747 | rtx insn; |
---|
1748 | { |
---|
1749 | if (insn) |
---|
1750 | { |
---|
1751 | insn = NEXT_INSN (insn); |
---|
1752 | if (insn && GET_CODE (insn) == INSN |
---|
1753 | && GET_CODE (PATTERN (insn)) == SEQUENCE) |
---|
1754 | insn = XVECEXP (PATTERN (insn), 0, 0); |
---|
1755 | } |
---|
1756 | |
---|
1757 | return insn; |
---|
1758 | } |
---|
1759 | |
---|
1760 | /* Return the previous insn. If it is a SEQUENCE, return the last insn |
---|
1761 | of the sequence. */ |
---|
1762 | |
---|
1763 | rtx |
---|
1764 | previous_insn (insn) |
---|
1765 | rtx insn; |
---|
1766 | { |
---|
1767 | if (insn) |
---|
1768 | { |
---|
1769 | insn = PREV_INSN (insn); |
---|
1770 | if (insn && GET_CODE (insn) == INSN |
---|
1771 | && GET_CODE (PATTERN (insn)) == SEQUENCE) |
---|
1772 | insn = XVECEXP (PATTERN (insn), 0, XVECLEN (PATTERN (insn), 0) - 1); |
---|
1773 | } |
---|
1774 | |
---|
1775 | return insn; |
---|
1776 | } |
---|
1777 | |
---|
1778 | /* Return the next insn after INSN that is not a NOTE. This routine does not |
---|
1779 | look inside SEQUENCEs. */ |
---|
1780 | |
---|
1781 | rtx |
---|
1782 | next_nonnote_insn (insn) |
---|
1783 | rtx insn; |
---|
1784 | { |
---|
1785 | while (insn) |
---|
1786 | { |
---|
1787 | insn = NEXT_INSN (insn); |
---|
1788 | if (insn == 0 || GET_CODE (insn) != NOTE) |
---|
1789 | break; |
---|
1790 | } |
---|
1791 | |
---|
1792 | return insn; |
---|
1793 | } |
---|
1794 | |
---|
1795 | /* Return the previous insn before INSN that is not a NOTE. This routine does |
---|
1796 | not look inside SEQUENCEs. */ |
---|
1797 | |
---|
1798 | rtx |
---|
1799 | prev_nonnote_insn (insn) |
---|
1800 | rtx insn; |
---|
1801 | { |
---|
1802 | while (insn) |
---|
1803 | { |
---|
1804 | insn = PREV_INSN (insn); |
---|
1805 | if (insn == 0 || GET_CODE (insn) != NOTE) |
---|
1806 | break; |
---|
1807 | } |
---|
1808 | |
---|
1809 | return insn; |
---|
1810 | } |
---|
1811 | |
---|
1812 | /* Return the next INSN, CALL_INSN or JUMP_INSN after INSN; |
---|
1813 | or 0, if there is none. This routine does not look inside |
---|
1814 | SEQUENCEs. */ |
---|
1815 | |
---|
1816 | rtx |
---|
1817 | next_real_insn (insn) |
---|
1818 | rtx insn; |
---|
1819 | { |
---|
1820 | while (insn) |
---|
1821 | { |
---|
1822 | insn = NEXT_INSN (insn); |
---|
1823 | if (insn == 0 || GET_CODE (insn) == INSN |
---|
1824 | || GET_CODE (insn) == CALL_INSN || GET_CODE (insn) == JUMP_INSN) |
---|
1825 | break; |
---|
1826 | } |
---|
1827 | |
---|
1828 | return insn; |
---|
1829 | } |
---|
1830 | |
---|
1831 | /* Return the last INSN, CALL_INSN or JUMP_INSN before INSN; |
---|
1832 | or 0, if there is none. This routine does not look inside |
---|
1833 | SEQUENCEs. */ |
---|
1834 | |
---|
1835 | rtx |
---|
1836 | prev_real_insn (insn) |
---|
1837 | rtx insn; |
---|
1838 | { |
---|
1839 | while (insn) |
---|
1840 | { |
---|
1841 | insn = PREV_INSN (insn); |
---|
1842 | if (insn == 0 || GET_CODE (insn) == INSN || GET_CODE (insn) == CALL_INSN |
---|
1843 | || GET_CODE (insn) == JUMP_INSN) |
---|
1844 | break; |
---|
1845 | } |
---|
1846 | |
---|
1847 | return insn; |
---|
1848 | } |
---|
1849 | |
---|
1850 | /* Find the next insn after INSN that really does something. This routine |
---|
1851 | does not look inside SEQUENCEs. Until reload has completed, this is the |
---|
1852 | same as next_real_insn. */ |
---|
1853 | |
---|
1854 | rtx |
---|
1855 | next_active_insn (insn) |
---|
1856 | rtx insn; |
---|
1857 | { |
---|
1858 | while (insn) |
---|
1859 | { |
---|
1860 | insn = NEXT_INSN (insn); |
---|
1861 | if (insn == 0 |
---|
1862 | || GET_CODE (insn) == CALL_INSN || GET_CODE (insn) == JUMP_INSN |
---|
1863 | || (GET_CODE (insn) == INSN |
---|
1864 | && (! reload_completed |
---|
1865 | || (GET_CODE (PATTERN (insn)) != USE |
---|
1866 | && GET_CODE (PATTERN (insn)) != CLOBBER)))) |
---|
1867 | break; |
---|
1868 | } |
---|
1869 | |
---|
1870 | return insn; |
---|
1871 | } |
---|
1872 | |
---|
1873 | /* Find the last insn before INSN that really does something. This routine |
---|
1874 | does not look inside SEQUENCEs. Until reload has completed, this is the |
---|
1875 | same as prev_real_insn. */ |
---|
1876 | |
---|
1877 | rtx |
---|
1878 | prev_active_insn (insn) |
---|
1879 | rtx insn; |
---|
1880 | { |
---|
1881 | while (insn) |
---|
1882 | { |
---|
1883 | insn = PREV_INSN (insn); |
---|
1884 | if (insn == 0 |
---|
1885 | || GET_CODE (insn) == CALL_INSN || GET_CODE (insn) == JUMP_INSN |
---|
1886 | || (GET_CODE (insn) == INSN |
---|
1887 | && (! reload_completed |
---|
1888 | || (GET_CODE (PATTERN (insn)) != USE |
---|
1889 | && GET_CODE (PATTERN (insn)) != CLOBBER)))) |
---|
1890 | break; |
---|
1891 | } |
---|
1892 | |
---|
1893 | return insn; |
---|
1894 | } |
---|
1895 | |
---|
1896 | /* Return the next CODE_LABEL after the insn INSN, or 0 if there is none. */ |
---|
1897 | |
---|
1898 | rtx |
---|
1899 | next_label (insn) |
---|
1900 | rtx insn; |
---|
1901 | { |
---|
1902 | while (insn) |
---|
1903 | { |
---|
1904 | insn = NEXT_INSN (insn); |
---|
1905 | if (insn == 0 || GET_CODE (insn) == CODE_LABEL) |
---|
1906 | break; |
---|
1907 | } |
---|
1908 | |
---|
1909 | return insn; |
---|
1910 | } |
---|
1911 | |
---|
1912 | /* Return the last CODE_LABEL before the insn INSN, or 0 if there is none. */ |
---|
1913 | |
---|
1914 | rtx |
---|
1915 | prev_label (insn) |
---|
1916 | rtx insn; |
---|
1917 | { |
---|
1918 | while (insn) |
---|
1919 | { |
---|
1920 | insn = PREV_INSN (insn); |
---|
1921 | if (insn == 0 || GET_CODE (insn) == CODE_LABEL) |
---|
1922 | break; |
---|
1923 | } |
---|
1924 | |
---|
1925 | return insn; |
---|
1926 | } |
---|
1927 | |
---|
1928 | #ifdef HAVE_cc0 |
---|
1929 | /* INSN uses CC0 and is being moved into a delay slot. Set up REG_CC_SETTER |
---|
1930 | and REG_CC_USER notes so we can find it. */ |
---|
1931 | |
---|
1932 | void |
---|
1933 | link_cc0_insns (insn) |
---|
1934 | rtx insn; |
---|
1935 | { |
---|
1936 | rtx user = next_nonnote_insn (insn); |
---|
1937 | |
---|
1938 | if (GET_CODE (user) == INSN && GET_CODE (PATTERN (user)) == SEQUENCE) |
---|
1939 | user = XVECEXP (PATTERN (user), 0, 0); |
---|
1940 | |
---|
1941 | REG_NOTES (user) = gen_rtx (INSN_LIST, REG_CC_SETTER, insn, |
---|
1942 | REG_NOTES (user)); |
---|
1943 | REG_NOTES (insn) = gen_rtx (INSN_LIST, REG_CC_USER, user, REG_NOTES (insn)); |
---|
1944 | } |
---|
1945 | |
---|
1946 | /* Return the next insn that uses CC0 after INSN, which is assumed to |
---|
1947 | set it. This is the inverse of prev_cc0_setter (i.e., prev_cc0_setter |
---|
1948 | applied to the result of this function should yield INSN). |
---|
1949 | |
---|
1950 | Normally, this is simply the next insn. However, if a REG_CC_USER note |
---|
1951 | is present, it contains the insn that uses CC0. |
---|
1952 | |
---|
1953 | Return 0 if we can't find the insn. */ |
---|
1954 | |
---|
1955 | rtx |
---|
1956 | next_cc0_user (insn) |
---|
1957 | rtx insn; |
---|
1958 | { |
---|
1959 | rtx note = find_reg_note (insn, REG_CC_USER, NULL_RTX); |
---|
1960 | |
---|
1961 | if (note) |
---|
1962 | return XEXP (note, 0); |
---|
1963 | |
---|
1964 | insn = next_nonnote_insn (insn); |
---|
1965 | if (insn && GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == SEQUENCE) |
---|
1966 | insn = XVECEXP (PATTERN (insn), 0, 0); |
---|
1967 | |
---|
1968 | if (insn && GET_RTX_CLASS (GET_CODE (insn)) == 'i' |
---|
1969 | && reg_mentioned_p (cc0_rtx, PATTERN (insn))) |
---|
1970 | return insn; |
---|
1971 | |
---|
1972 | return 0; |
---|
1973 | } |
---|
1974 | |
---|
1975 | /* Find the insn that set CC0 for INSN. Unless INSN has a REG_CC_SETTER |
---|
1976 | note, it is the previous insn. */ |
---|
1977 | |
---|
1978 | rtx |
---|
1979 | prev_cc0_setter (insn) |
---|
1980 | rtx insn; |
---|
1981 | { |
---|
1982 | rtx note = find_reg_note (insn, REG_CC_SETTER, NULL_RTX); |
---|
1983 | rtx link; |
---|
1984 | |
---|
1985 | if (note) |
---|
1986 | return XEXP (note, 0); |
---|
1987 | |
---|
1988 | insn = prev_nonnote_insn (insn); |
---|
1989 | if (! sets_cc0_p (PATTERN (insn))) |
---|
1990 | abort (); |
---|
1991 | |
---|
1992 | return insn; |
---|
1993 | } |
---|
1994 | #endif |
---|
1995 | |
---|
1996 | /* Try splitting insns that can be split for better scheduling. |
---|
1997 | PAT is the pattern which might split. |
---|
1998 | TRIAL is the insn providing PAT. |
---|
1999 | LAST is non-zero if we should return the last insn of the sequence produced. |
---|
2000 | |
---|
2001 | If this routine succeeds in splitting, it returns the first or last |
---|
2002 | replacement insn depending on the value of LAST. Otherwise, it |
---|
2003 | returns TRIAL. If the insn to be returned can be split, it will be. */ |
---|
2004 | |
---|
2005 | rtx |
---|
2006 | try_split (pat, trial, last) |
---|
2007 | rtx pat, trial; |
---|
2008 | int last; |
---|
2009 | { |
---|
2010 | rtx before = PREV_INSN (trial); |
---|
2011 | rtx after = NEXT_INSN (trial); |
---|
2012 | rtx seq = split_insns (pat, trial); |
---|
2013 | int has_barrier = 0; |
---|
2014 | rtx tem; |
---|
2015 | |
---|
2016 | /* If we are splitting a JUMP_INSN, it might be followed by a BARRIER. |
---|
2017 | We may need to handle this specially. */ |
---|
2018 | if (after && GET_CODE (after) == BARRIER) |
---|
2019 | { |
---|
2020 | has_barrier = 1; |
---|
2021 | after = NEXT_INSN (after); |
---|
2022 | } |
---|
2023 | |
---|
2024 | if (seq) |
---|
2025 | { |
---|
2026 | /* SEQ can either be a SEQUENCE or the pattern of a single insn. |
---|
2027 | The latter case will normally arise only when being done so that |
---|
2028 | it, in turn, will be split (SFmode on the 29k is an example). */ |
---|
2029 | if (GET_CODE (seq) == SEQUENCE) |
---|
2030 | { |
---|
2031 | /* If we are splitting a JUMP_INSN, look for the JUMP_INSN in |
---|
2032 | SEQ and copy our JUMP_LABEL to it. If JUMP_LABEL is non-zero, |
---|
2033 | increment the usage count so we don't delete the label. */ |
---|
2034 | int i; |
---|
2035 | |
---|
2036 | if (GET_CODE (trial) == JUMP_INSN) |
---|
2037 | for (i = XVECLEN (seq, 0) - 1; i >= 0; i--) |
---|
2038 | if (GET_CODE (XVECEXP (seq, 0, i)) == JUMP_INSN) |
---|
2039 | { |
---|
2040 | JUMP_LABEL (XVECEXP (seq, 0, i)) = JUMP_LABEL (trial); |
---|
2041 | |
---|
2042 | if (JUMP_LABEL (trial)) |
---|
2043 | LABEL_NUSES (JUMP_LABEL (trial))++; |
---|
2044 | } |
---|
2045 | |
---|
2046 | tem = emit_insn_after (seq, before); |
---|
2047 | |
---|
2048 | delete_insn (trial); |
---|
2049 | if (has_barrier) |
---|
2050 | emit_barrier_after (tem); |
---|
2051 | |
---|
2052 | /* Recursively call try_split for each new insn created; by the |
---|
2053 | time control returns here that insn will be fully split, so |
---|
2054 | set LAST and continue from the insn after the one returned. |
---|
2055 | We can't use next_active_insn here since AFTER may be a note. |
---|
2056 | Ignore deleted insns, which can be occur if not optimizing. */ |
---|
2057 | for (tem = NEXT_INSN (before); tem != after; |
---|
2058 | tem = NEXT_INSN (tem)) |
---|
2059 | if (! INSN_DELETED_P (tem)) |
---|
2060 | tem = try_split (PATTERN (tem), tem, 1); |
---|
2061 | } |
---|
2062 | /* Avoid infinite loop if the result matches the original pattern. */ |
---|
2063 | else if (rtx_equal_p (seq, pat)) |
---|
2064 | return trial; |
---|
2065 | else |
---|
2066 | { |
---|
2067 | PATTERN (trial) = seq; |
---|
2068 | INSN_CODE (trial) = -1; |
---|
2069 | try_split (seq, trial, last); |
---|
2070 | } |
---|
2071 | |
---|
2072 | /* Return either the first or the last insn, depending on which was |
---|
2073 | requested. */ |
---|
2074 | return last ? prev_active_insn (after) : next_active_insn (before); |
---|
2075 | } |
---|
2076 | |
---|
2077 | return trial; |
---|
2078 | } |
---|
2079 | |
---|
2080 | /* Make and return an INSN rtx, initializing all its slots. |
---|
2081 | Store PATTERN in the pattern slots. */ |
---|
2082 | |
---|
2083 | rtx |
---|
2084 | make_insn_raw (pattern) |
---|
2085 | rtx pattern; |
---|
2086 | { |
---|
2087 | register rtx insn; |
---|
2088 | |
---|
2089 | insn = rtx_alloc (INSN); |
---|
2090 | INSN_UID (insn) = cur_insn_uid++; |
---|
2091 | |
---|
2092 | PATTERN (insn) = pattern; |
---|
2093 | INSN_CODE (insn) = -1; |
---|
2094 | LOG_LINKS (insn) = NULL; |
---|
2095 | REG_NOTES (insn) = NULL; |
---|
2096 | |
---|
2097 | return insn; |
---|
2098 | } |
---|
2099 | |
---|
2100 | /* Like `make_insn' but make a JUMP_INSN instead of an insn. */ |
---|
2101 | |
---|
2102 | static rtx |
---|
2103 | make_jump_insn_raw (pattern) |
---|
2104 | rtx pattern; |
---|
2105 | { |
---|
2106 | register rtx insn; |
---|
2107 | |
---|
2108 | insn = rtx_alloc (JUMP_INSN); |
---|
2109 | INSN_UID (insn) = cur_insn_uid++; |
---|
2110 | |
---|
2111 | PATTERN (insn) = pattern; |
---|
2112 | INSN_CODE (insn) = -1; |
---|
2113 | LOG_LINKS (insn) = NULL; |
---|
2114 | REG_NOTES (insn) = NULL; |
---|
2115 | JUMP_LABEL (insn) = NULL; |
---|
2116 | |
---|
2117 | return insn; |
---|
2118 | } |
---|
2119 | |
---|
2120 | /* Like `make_insn' but make a CALL_INSN instead of an insn. */ |
---|
2121 | |
---|
2122 | static rtx |
---|
2123 | make_call_insn_raw (pattern) |
---|
2124 | rtx pattern; |
---|
2125 | { |
---|
2126 | register rtx insn; |
---|
2127 | |
---|
2128 | insn = rtx_alloc (CALL_INSN); |
---|
2129 | INSN_UID (insn) = cur_insn_uid++; |
---|
2130 | |
---|
2131 | PATTERN (insn) = pattern; |
---|
2132 | INSN_CODE (insn) = -1; |
---|
2133 | LOG_LINKS (insn) = NULL; |
---|
2134 | REG_NOTES (insn) = NULL; |
---|
2135 | CALL_INSN_FUNCTION_USAGE (insn) = NULL; |
---|
2136 | |
---|
2137 | return insn; |
---|
2138 | } |
---|
2139 | |
---|
2140 | /* Add INSN to the end of the doubly-linked list. |
---|
2141 | INSN may be an INSN, JUMP_INSN, CALL_INSN, CODE_LABEL, BARRIER or NOTE. */ |
---|
2142 | |
---|
2143 | void |
---|
2144 | add_insn (insn) |
---|
2145 | register rtx insn; |
---|
2146 | { |
---|
2147 | PREV_INSN (insn) = last_insn; |
---|
2148 | NEXT_INSN (insn) = 0; |
---|
2149 | |
---|
2150 | if (NULL != last_insn) |
---|
2151 | NEXT_INSN (last_insn) = insn; |
---|
2152 | |
---|
2153 | if (NULL == first_insn) |
---|
2154 | first_insn = insn; |
---|
2155 | |
---|
2156 | last_insn = insn; |
---|
2157 | } |
---|
2158 | |
---|
2159 | /* Add INSN into the doubly-linked list after insn AFTER. This and |
---|
2160 | the next should be the only functions called to insert an insn once |
---|
2161 | delay slots have been filled since only they know how to update a |
---|
2162 | SEQUENCE. */ |
---|
2163 | |
---|
2164 | void |
---|
2165 | add_insn_after (insn, after) |
---|
2166 | rtx insn, after; |
---|
2167 | { |
---|
2168 | rtx next = NEXT_INSN (after); |
---|
2169 | |
---|
2170 | if (optimize && INSN_DELETED_P (after)) |
---|
2171 | abort (); |
---|
2172 | |
---|
2173 | NEXT_INSN (insn) = next; |
---|
2174 | PREV_INSN (insn) = after; |
---|
2175 | |
---|
2176 | if (next) |
---|
2177 | { |
---|
2178 | PREV_INSN (next) = insn; |
---|
2179 | if (GET_CODE (next) == INSN && GET_CODE (PATTERN (next)) == SEQUENCE) |
---|
2180 | PREV_INSN (XVECEXP (PATTERN (next), 0, 0)) = insn; |
---|
2181 | } |
---|
2182 | else if (last_insn == after) |
---|
2183 | last_insn = insn; |
---|
2184 | else |
---|
2185 | { |
---|
2186 | struct sequence_stack *stack = sequence_stack; |
---|
2187 | /* Scan all pending sequences too. */ |
---|
2188 | for (; stack; stack = stack->next) |
---|
2189 | if (after == stack->last) |
---|
2190 | { |
---|
2191 | stack->last = insn; |
---|
2192 | break; |
---|
2193 | } |
---|
2194 | |
---|
2195 | if (stack == 0) |
---|
2196 | abort (); |
---|
2197 | } |
---|
2198 | |
---|
2199 | NEXT_INSN (after) = insn; |
---|
2200 | if (GET_CODE (after) == INSN && GET_CODE (PATTERN (after)) == SEQUENCE) |
---|
2201 | { |
---|
2202 | rtx sequence = PATTERN (after); |
---|
2203 | NEXT_INSN (XVECEXP (sequence, 0, XVECLEN (sequence, 0) - 1)) = insn; |
---|
2204 | } |
---|
2205 | } |
---|
2206 | |
---|
2207 | /* Add INSN into the doubly-linked list before insn BEFORE. This and |
---|
2208 | the previous should be the only functions called to insert an insn once |
---|
2209 | delay slots have been filled since only they know how to update a |
---|
2210 | SEQUENCE. */ |
---|
2211 | |
---|
2212 | void |
---|
2213 | add_insn_before (insn, before) |
---|
2214 | rtx insn, before; |
---|
2215 | { |
---|
2216 | rtx prev = PREV_INSN (before); |
---|
2217 | |
---|
2218 | if (optimize && INSN_DELETED_P (before)) |
---|
2219 | abort (); |
---|
2220 | |
---|
2221 | PREV_INSN (insn) = prev; |
---|
2222 | NEXT_INSN (insn) = before; |
---|
2223 | |
---|
2224 | if (prev) |
---|
2225 | { |
---|
2226 | NEXT_INSN (prev) = insn; |
---|
2227 | if (GET_CODE (prev) == INSN && GET_CODE (PATTERN (prev)) == SEQUENCE) |
---|
2228 | { |
---|
2229 | rtx sequence = PATTERN (prev); |
---|
2230 | NEXT_INSN (XVECEXP (sequence, 0, XVECLEN (sequence, 0) - 1)) = insn; |
---|
2231 | } |
---|
2232 | } |
---|
2233 | else if (first_insn == before) |
---|
2234 | first_insn = insn; |
---|
2235 | else |
---|
2236 | { |
---|
2237 | struct sequence_stack *stack = sequence_stack; |
---|
2238 | /* Scan all pending sequences too. */ |
---|
2239 | for (; stack; stack = stack->next) |
---|
2240 | if (before == stack->first) |
---|
2241 | { |
---|
2242 | stack->first = insn; |
---|
2243 | break; |
---|
2244 | } |
---|
2245 | |
---|
2246 | if (stack == 0) |
---|
2247 | abort (); |
---|
2248 | } |
---|
2249 | |
---|
2250 | PREV_INSN (before) = insn; |
---|
2251 | if (GET_CODE (before) == INSN && GET_CODE (PATTERN (before)) == SEQUENCE) |
---|
2252 | PREV_INSN (XVECEXP (PATTERN (before), 0, 0)) = insn; |
---|
2253 | } |
---|
2254 | |
---|
2255 | /* Delete all insns made since FROM. |
---|
2256 | FROM becomes the new last instruction. */ |
---|
2257 | |
---|
2258 | void |
---|
2259 | delete_insns_since (from) |
---|
2260 | rtx from; |
---|
2261 | { |
---|
2262 | if (from == 0) |
---|
2263 | first_insn = 0; |
---|
2264 | else |
---|
2265 | NEXT_INSN (from) = 0; |
---|
2266 | last_insn = from; |
---|
2267 | } |
---|
2268 | |
---|
2269 | /* This function is deprecated, please use sequences instead. |
---|
2270 | |
---|
2271 | Move a consecutive bunch of insns to a different place in the chain. |
---|
2272 | The insns to be moved are those between FROM and TO. |
---|
2273 | They are moved to a new position after the insn AFTER. |
---|
2274 | AFTER must not be FROM or TO or any insn in between. |
---|
2275 | |
---|
2276 | This function does not know about SEQUENCEs and hence should not be |
---|
2277 | called after delay-slot filling has been done. */ |
---|
2278 | |
---|
2279 | void |
---|
2280 | reorder_insns (from, to, after) |
---|
2281 | rtx from, to, after; |
---|
2282 | { |
---|
2283 | /* Splice this bunch out of where it is now. */ |
---|
2284 | if (PREV_INSN (from)) |
---|
2285 | NEXT_INSN (PREV_INSN (from)) = NEXT_INSN (to); |
---|
2286 | if (NEXT_INSN (to)) |
---|
2287 | PREV_INSN (NEXT_INSN (to)) = PREV_INSN (from); |
---|
2288 | if (last_insn == to) |
---|
2289 | last_insn = PREV_INSN (from); |
---|
2290 | if (first_insn == from) |
---|
2291 | first_insn = NEXT_INSN (to); |
---|
2292 | |
---|
2293 | /* Make the new neighbors point to it and it to them. */ |
---|
2294 | if (NEXT_INSN (after)) |
---|
2295 | PREV_INSN (NEXT_INSN (after)) = to; |
---|
2296 | |
---|
2297 | NEXT_INSN (to) = NEXT_INSN (after); |
---|
2298 | PREV_INSN (from) = after; |
---|
2299 | NEXT_INSN (after) = from; |
---|
2300 | if (after == last_insn) |
---|
2301 | last_insn = to; |
---|
2302 | } |
---|
2303 | |
---|
2304 | /* Return the line note insn preceding INSN. */ |
---|
2305 | |
---|
2306 | static rtx |
---|
2307 | find_line_note (insn) |
---|
2308 | rtx insn; |
---|
2309 | { |
---|
2310 | if (no_line_numbers) |
---|
2311 | return 0; |
---|
2312 | |
---|
2313 | for (; insn; insn = PREV_INSN (insn)) |
---|
2314 | if (GET_CODE (insn) == NOTE |
---|
2315 | && NOTE_LINE_NUMBER (insn) >= 0) |
---|
2316 | break; |
---|
2317 | |
---|
2318 | return insn; |
---|
2319 | } |
---|
2320 | |
---|
2321 | /* Like reorder_insns, but inserts line notes to preserve the line numbers |
---|
2322 | of the moved insns when debugging. This may insert a note between AFTER |
---|
2323 | and FROM, and another one after TO. */ |
---|
2324 | |
---|
2325 | void |
---|
2326 | reorder_insns_with_line_notes (from, to, after) |
---|
2327 | rtx from, to, after; |
---|
2328 | { |
---|
2329 | rtx from_line = find_line_note (from); |
---|
2330 | rtx after_line = find_line_note (after); |
---|
2331 | |
---|
2332 | reorder_insns (from, to, after); |
---|
2333 | |
---|
2334 | if (from_line == after_line) |
---|
2335 | return; |
---|
2336 | |
---|
2337 | if (from_line) |
---|
2338 | emit_line_note_after (NOTE_SOURCE_FILE (from_line), |
---|
2339 | NOTE_LINE_NUMBER (from_line), |
---|
2340 | after); |
---|
2341 | if (after_line) |
---|
2342 | emit_line_note_after (NOTE_SOURCE_FILE (after_line), |
---|
2343 | NOTE_LINE_NUMBER (after_line), |
---|
2344 | to); |
---|
2345 | } |
---|
2346 | |
---|
2347 | /* Emit an insn of given code and pattern |
---|
2348 | at a specified place within the doubly-linked list. */ |
---|
2349 | |
---|
2350 | /* Make an instruction with body PATTERN |
---|
2351 | and output it before the instruction BEFORE. */ |
---|
2352 | |
---|
2353 | rtx |
---|
2354 | emit_insn_before (pattern, before) |
---|
2355 | register rtx pattern, before; |
---|
2356 | { |
---|
2357 | register rtx insn = before; |
---|
2358 | |
---|
2359 | if (GET_CODE (pattern) == SEQUENCE) |
---|
2360 | { |
---|
2361 | register int i; |
---|
2362 | |
---|
2363 | for (i = 0; i < XVECLEN (pattern, 0); i++) |
---|
2364 | { |
---|
2365 | insn = XVECEXP (pattern, 0, i); |
---|
2366 | add_insn_before (insn, before); |
---|
2367 | } |
---|
2368 | if (XVECLEN (pattern, 0) < SEQUENCE_RESULT_SIZE) |
---|
2369 | sequence_result[XVECLEN (pattern, 0)] = pattern; |
---|
2370 | } |
---|
2371 | else |
---|
2372 | { |
---|
2373 | insn = make_insn_raw (pattern); |
---|
2374 | add_insn_before (insn, before); |
---|
2375 | } |
---|
2376 | |
---|
2377 | return insn; |
---|
2378 | } |
---|
2379 | |
---|
2380 | /* Make an instruction with body PATTERN and code JUMP_INSN |
---|
2381 | and output it before the instruction BEFORE. */ |
---|
2382 | |
---|
2383 | rtx |
---|
2384 | emit_jump_insn_before (pattern, before) |
---|
2385 | register rtx pattern, before; |
---|
2386 | { |
---|
2387 | register rtx insn; |
---|
2388 | |
---|
2389 | if (GET_CODE (pattern) == SEQUENCE) |
---|
2390 | insn = emit_insn_before (pattern, before); |
---|
2391 | else |
---|
2392 | { |
---|
2393 | insn = make_jump_insn_raw (pattern); |
---|
2394 | add_insn_before (insn, before); |
---|
2395 | } |
---|
2396 | |
---|
2397 | return insn; |
---|
2398 | } |
---|
2399 | |
---|
2400 | /* Make an instruction with body PATTERN and code CALL_INSN |
---|
2401 | and output it before the instruction BEFORE. */ |
---|
2402 | |
---|
2403 | rtx |
---|
2404 | emit_call_insn_before (pattern, before) |
---|
2405 | register rtx pattern, before; |
---|
2406 | { |
---|
2407 | register rtx insn; |
---|
2408 | |
---|
2409 | if (GET_CODE (pattern) == SEQUENCE) |
---|
2410 | insn = emit_insn_before (pattern, before); |
---|
2411 | else |
---|
2412 | { |
---|
2413 | insn = make_call_insn_raw (pattern); |
---|
2414 | add_insn_before (insn, before); |
---|
2415 | PUT_CODE (insn, CALL_INSN); |
---|
2416 | } |
---|
2417 | |
---|
2418 | return insn; |
---|
2419 | } |
---|
2420 | |
---|
2421 | /* Make an insn of code BARRIER |
---|
2422 | and output it before the insn AFTER. */ |
---|
2423 | |
---|
2424 | rtx |
---|
2425 | emit_barrier_before (before) |
---|
2426 | register rtx before; |
---|
2427 | { |
---|
2428 | register rtx insn = rtx_alloc (BARRIER); |
---|
2429 | |
---|
2430 | INSN_UID (insn) = cur_insn_uid++; |
---|
2431 | |
---|
2432 | add_insn_before (insn, before); |
---|
2433 | return insn; |
---|
2434 | } |
---|
2435 | |
---|
2436 | /* Emit a note of subtype SUBTYPE before the insn BEFORE. */ |
---|
2437 | |
---|
2438 | rtx |
---|
2439 | emit_note_before (subtype, before) |
---|
2440 | int subtype; |
---|
2441 | rtx before; |
---|
2442 | { |
---|
2443 | register rtx note = rtx_alloc (NOTE); |
---|
2444 | INSN_UID (note) = cur_insn_uid++; |
---|
2445 | NOTE_SOURCE_FILE (note) = 0; |
---|
2446 | NOTE_LINE_NUMBER (note) = subtype; |
---|
2447 | |
---|
2448 | add_insn_before (note, before); |
---|
2449 | return note; |
---|
2450 | } |
---|
2451 | |
---|
2452 | /* Make an insn of code INSN with body PATTERN |
---|
2453 | and output it after the insn AFTER. */ |
---|
2454 | |
---|
2455 | rtx |
---|
2456 | emit_insn_after (pattern, after) |
---|
2457 | register rtx pattern, after; |
---|
2458 | { |
---|
2459 | register rtx insn = after; |
---|
2460 | |
---|
2461 | if (GET_CODE (pattern) == SEQUENCE) |
---|
2462 | { |
---|
2463 | register int i; |
---|
2464 | |
---|
2465 | for (i = 0; i < XVECLEN (pattern, 0); i++) |
---|
2466 | { |
---|
2467 | insn = XVECEXP (pattern, 0, i); |
---|
2468 | add_insn_after (insn, after); |
---|
2469 | after = insn; |
---|
2470 | } |
---|
2471 | if (XVECLEN (pattern, 0) < SEQUENCE_RESULT_SIZE) |
---|
2472 | sequence_result[XVECLEN (pattern, 0)] = pattern; |
---|
2473 | } |
---|
2474 | else |
---|
2475 | { |
---|
2476 | insn = make_insn_raw (pattern); |
---|
2477 | add_insn_after (insn, after); |
---|
2478 | } |
---|
2479 | |
---|
2480 | return insn; |
---|
2481 | } |
---|
2482 | |
---|
2483 | /* Similar to emit_insn_after, except that line notes are to be inserted so |
---|
2484 | as to act as if this insn were at FROM. */ |
---|
2485 | |
---|
2486 | void |
---|
2487 | emit_insn_after_with_line_notes (pattern, after, from) |
---|
2488 | rtx pattern, after, from; |
---|
2489 | { |
---|
2490 | rtx from_line = find_line_note (from); |
---|
2491 | rtx after_line = find_line_note (after); |
---|
2492 | rtx insn = emit_insn_after (pattern, after); |
---|
2493 | |
---|
2494 | if (from_line) |
---|
2495 | emit_line_note_after (NOTE_SOURCE_FILE (from_line), |
---|
2496 | NOTE_LINE_NUMBER (from_line), |
---|
2497 | after); |
---|
2498 | |
---|
2499 | if (after_line) |
---|
2500 | emit_line_note_after (NOTE_SOURCE_FILE (after_line), |
---|
2501 | NOTE_LINE_NUMBER (after_line), |
---|
2502 | insn); |
---|
2503 | } |
---|
2504 | |
---|
2505 | /* Make an insn of code JUMP_INSN with body PATTERN |
---|
2506 | and output it after the insn AFTER. */ |
---|
2507 | |
---|
2508 | rtx |
---|
2509 | emit_jump_insn_after (pattern, after) |
---|
2510 | register rtx pattern, after; |
---|
2511 | { |
---|
2512 | register rtx insn; |
---|
2513 | |
---|
2514 | if (GET_CODE (pattern) == SEQUENCE) |
---|
2515 | insn = emit_insn_after (pattern, after); |
---|
2516 | else |
---|
2517 | { |
---|
2518 | insn = make_jump_insn_raw (pattern); |
---|
2519 | add_insn_after (insn, after); |
---|
2520 | } |
---|
2521 | |
---|
2522 | return insn; |
---|
2523 | } |
---|
2524 | |
---|
2525 | /* Make an insn of code BARRIER |
---|
2526 | and output it after the insn AFTER. */ |
---|
2527 | |
---|
2528 | rtx |
---|
2529 | emit_barrier_after (after) |
---|
2530 | register rtx after; |
---|
2531 | { |
---|
2532 | register rtx insn = rtx_alloc (BARRIER); |
---|
2533 | |
---|
2534 | INSN_UID (insn) = cur_insn_uid++; |
---|
2535 | |
---|
2536 | add_insn_after (insn, after); |
---|
2537 | return insn; |
---|
2538 | } |
---|
2539 | |
---|
2540 | /* Emit the label LABEL after the insn AFTER. */ |
---|
2541 | |
---|
2542 | rtx |
---|
2543 | emit_label_after (label, after) |
---|
2544 | rtx label, after; |
---|
2545 | { |
---|
2546 | /* This can be called twice for the same label |
---|
2547 | as a result of the confusion that follows a syntax error! |
---|
2548 | So make it harmless. */ |
---|
2549 | if (INSN_UID (label) == 0) |
---|
2550 | { |
---|
2551 | INSN_UID (label) = cur_insn_uid++; |
---|
2552 | add_insn_after (label, after); |
---|
2553 | } |
---|
2554 | |
---|
2555 | return label; |
---|
2556 | } |
---|
2557 | |
---|
2558 | /* Emit a note of subtype SUBTYPE after the insn AFTER. */ |
---|
2559 | |
---|
2560 | rtx |
---|
2561 | emit_note_after (subtype, after) |
---|
2562 | int subtype; |
---|
2563 | rtx after; |
---|
2564 | { |
---|
2565 | register rtx note = rtx_alloc (NOTE); |
---|
2566 | INSN_UID (note) = cur_insn_uid++; |
---|
2567 | NOTE_SOURCE_FILE (note) = 0; |
---|
2568 | NOTE_LINE_NUMBER (note) = subtype; |
---|
2569 | add_insn_after (note, after); |
---|
2570 | return note; |
---|
2571 | } |
---|
2572 | |
---|
2573 | /* Emit a line note for FILE and LINE after the insn AFTER. */ |
---|
2574 | |
---|
2575 | rtx |
---|
2576 | emit_line_note_after (file, line, after) |
---|
2577 | char *file; |
---|
2578 | int line; |
---|
2579 | rtx after; |
---|
2580 | { |
---|
2581 | register rtx note; |
---|
2582 | |
---|
2583 | if (no_line_numbers && line > 0) |
---|
2584 | { |
---|
2585 | cur_insn_uid++; |
---|
2586 | return 0; |
---|
2587 | } |
---|
2588 | |
---|
2589 | note = rtx_alloc (NOTE); |
---|
2590 | INSN_UID (note) = cur_insn_uid++; |
---|
2591 | NOTE_SOURCE_FILE (note) = file; |
---|
2592 | NOTE_LINE_NUMBER (note) = line; |
---|
2593 | add_insn_after (note, after); |
---|
2594 | return note; |
---|
2595 | } |
---|
2596 | |
---|
2597 | /* Make an insn of code INSN with pattern PATTERN |
---|
2598 | and add it to the end of the doubly-linked list. |
---|
2599 | If PATTERN is a SEQUENCE, take the elements of it |
---|
2600 | and emit an insn for each element. |
---|
2601 | |
---|
2602 | Returns the last insn emitted. */ |
---|
2603 | |
---|
2604 | rtx |
---|
2605 | emit_insn (pattern) |
---|
2606 | rtx pattern; |
---|
2607 | { |
---|
2608 | rtx insn = last_insn; |
---|
2609 | |
---|
2610 | if (GET_CODE (pattern) == SEQUENCE) |
---|
2611 | { |
---|
2612 | register int i; |
---|
2613 | |
---|
2614 | for (i = 0; i < XVECLEN (pattern, 0); i++) |
---|
2615 | { |
---|
2616 | insn = XVECEXP (pattern, 0, i); |
---|
2617 | add_insn (insn); |
---|
2618 | } |
---|
2619 | if (XVECLEN (pattern, 0) < SEQUENCE_RESULT_SIZE) |
---|
2620 | sequence_result[XVECLEN (pattern, 0)] = pattern; |
---|
2621 | } |
---|
2622 | else |
---|
2623 | { |
---|
2624 | insn = make_insn_raw (pattern); |
---|
2625 | add_insn (insn); |
---|
2626 | } |
---|
2627 | |
---|
2628 | return insn; |
---|
2629 | } |
---|
2630 | |
---|
2631 | /* Emit the insns in a chain starting with INSN. |
---|
2632 | Return the last insn emitted. */ |
---|
2633 | |
---|
2634 | rtx |
---|
2635 | emit_insns (insn) |
---|
2636 | rtx insn; |
---|
2637 | { |
---|
2638 | rtx last = 0; |
---|
2639 | |
---|
2640 | while (insn) |
---|
2641 | { |
---|
2642 | rtx next = NEXT_INSN (insn); |
---|
2643 | add_insn (insn); |
---|
2644 | last = insn; |
---|
2645 | insn = next; |
---|
2646 | } |
---|
2647 | |
---|
2648 | return last; |
---|
2649 | } |
---|
2650 | |
---|
2651 | /* Emit the insns in a chain starting with INSN and place them in front of |
---|
2652 | the insn BEFORE. Return the last insn emitted. */ |
---|
2653 | |
---|
2654 | rtx |
---|
2655 | emit_insns_before (insn, before) |
---|
2656 | rtx insn; |
---|
2657 | rtx before; |
---|
2658 | { |
---|
2659 | rtx last = 0; |
---|
2660 | |
---|
2661 | while (insn) |
---|
2662 | { |
---|
2663 | rtx next = NEXT_INSN (insn); |
---|
2664 | add_insn_before (insn, before); |
---|
2665 | last = insn; |
---|
2666 | insn = next; |
---|
2667 | } |
---|
2668 | |
---|
2669 | return last; |
---|
2670 | } |
---|
2671 | |
---|
2672 | /* Emit the insns in a chain starting with FIRST and place them in back of |
---|
2673 | the insn AFTER. Return the last insn emitted. */ |
---|
2674 | |
---|
2675 | rtx |
---|
2676 | emit_insns_after (first, after) |
---|
2677 | register rtx first; |
---|
2678 | register rtx after; |
---|
2679 | { |
---|
2680 | register rtx last; |
---|
2681 | register rtx after_after; |
---|
2682 | |
---|
2683 | if (!after) |
---|
2684 | abort (); |
---|
2685 | |
---|
2686 | if (!first) |
---|
2687 | return first; |
---|
2688 | |
---|
2689 | for (last = first; NEXT_INSN (last); last = NEXT_INSN (last)) |
---|
2690 | continue; |
---|
2691 | |
---|
2692 | after_after = NEXT_INSN (after); |
---|
2693 | |
---|
2694 | NEXT_INSN (after) = first; |
---|
2695 | PREV_INSN (first) = after; |
---|
2696 | NEXT_INSN (last) = after_after; |
---|
2697 | if (after_after) |
---|
2698 | PREV_INSN (after_after) = last; |
---|
2699 | |
---|
2700 | if (after == last_insn) |
---|
2701 | last_insn = last; |
---|
2702 | return last; |
---|
2703 | } |
---|
2704 | |
---|
2705 | /* Make an insn of code JUMP_INSN with pattern PATTERN |
---|
2706 | and add it to the end of the doubly-linked list. */ |
---|
2707 | |
---|
2708 | rtx |
---|
2709 | emit_jump_insn (pattern) |
---|
2710 | rtx pattern; |
---|
2711 | { |
---|
2712 | if (GET_CODE (pattern) == SEQUENCE) |
---|
2713 | return emit_insn (pattern); |
---|
2714 | else |
---|
2715 | { |
---|
2716 | register rtx insn = make_jump_insn_raw (pattern); |
---|
2717 | add_insn (insn); |
---|
2718 | return insn; |
---|
2719 | } |
---|
2720 | } |
---|
2721 | |
---|
2722 | /* Make an insn of code CALL_INSN with pattern PATTERN |
---|
2723 | and add it to the end of the doubly-linked list. */ |
---|
2724 | |
---|
2725 | rtx |
---|
2726 | emit_call_insn (pattern) |
---|
2727 | rtx pattern; |
---|
2728 | { |
---|
2729 | if (GET_CODE (pattern) == SEQUENCE) |
---|
2730 | return emit_insn (pattern); |
---|
2731 | else |
---|
2732 | { |
---|
2733 | register rtx insn = make_call_insn_raw (pattern); |
---|
2734 | add_insn (insn); |
---|
2735 | PUT_CODE (insn, CALL_INSN); |
---|
2736 | return insn; |
---|
2737 | } |
---|
2738 | } |
---|
2739 | |
---|
2740 | /* Add the label LABEL to the end of the doubly-linked list. */ |
---|
2741 | |
---|
2742 | rtx |
---|
2743 | emit_label (label) |
---|
2744 | rtx label; |
---|
2745 | { |
---|
2746 | /* This can be called twice for the same label |
---|
2747 | as a result of the confusion that follows a syntax error! |
---|
2748 | So make it harmless. */ |
---|
2749 | if (INSN_UID (label) == 0) |
---|
2750 | { |
---|
2751 | INSN_UID (label) = cur_insn_uid++; |
---|
2752 | add_insn (label); |
---|
2753 | } |
---|
2754 | return label; |
---|
2755 | } |
---|
2756 | |
---|
2757 | /* Make an insn of code BARRIER |
---|
2758 | and add it to the end of the doubly-linked list. */ |
---|
2759 | |
---|
2760 | rtx |
---|
2761 | emit_barrier () |
---|
2762 | { |
---|
2763 | register rtx barrier = rtx_alloc (BARRIER); |
---|
2764 | INSN_UID (barrier) = cur_insn_uid++; |
---|
2765 | add_insn (barrier); |
---|
2766 | return barrier; |
---|
2767 | } |
---|
2768 | |
---|
2769 | /* Make an insn of code NOTE |
---|
2770 | with data-fields specified by FILE and LINE |
---|
2771 | and add it to the end of the doubly-linked list, |
---|
2772 | but only if line-numbers are desired for debugging info. */ |
---|
2773 | |
---|
2774 | rtx |
---|
2775 | emit_line_note (file, line) |
---|
2776 | char *file; |
---|
2777 | int line; |
---|
2778 | { |
---|
2779 | if (output_bytecode) |
---|
2780 | { |
---|
2781 | /* FIXME: for now we do nothing, but eventually we will have to deal with |
---|
2782 | debugging information. */ |
---|
2783 | return 0; |
---|
2784 | } |
---|
2785 | |
---|
2786 | emit_filename = file; |
---|
2787 | emit_lineno = line; |
---|
2788 | |
---|
2789 | #if 0 |
---|
2790 | if (no_line_numbers) |
---|
2791 | return 0; |
---|
2792 | #endif |
---|
2793 | |
---|
2794 | return emit_note (file, line); |
---|
2795 | } |
---|
2796 | |
---|
2797 | /* Make an insn of code NOTE |
---|
2798 | with data-fields specified by FILE and LINE |
---|
2799 | and add it to the end of the doubly-linked list. |
---|
2800 | If it is a line-number NOTE, omit it if it matches the previous one. */ |
---|
2801 | |
---|
2802 | rtx |
---|
2803 | emit_note (file, line) |
---|
2804 | char *file; |
---|
2805 | int line; |
---|
2806 | { |
---|
2807 | register rtx note; |
---|
2808 | |
---|
2809 | if (line > 0) |
---|
2810 | { |
---|
2811 | if (file && last_filename && !strcmp (file, last_filename) |
---|
2812 | && line == last_linenum) |
---|
2813 | return 0; |
---|
2814 | last_filename = file; |
---|
2815 | last_linenum = line; |
---|
2816 | } |
---|
2817 | |
---|
2818 | if (no_line_numbers && line > 0) |
---|
2819 | { |
---|
2820 | cur_insn_uid++; |
---|
2821 | return 0; |
---|
2822 | } |
---|
2823 | |
---|
2824 | note = rtx_alloc (NOTE); |
---|
2825 | INSN_UID (note) = cur_insn_uid++; |
---|
2826 | NOTE_SOURCE_FILE (note) = file; |
---|
2827 | NOTE_LINE_NUMBER (note) = line; |
---|
2828 | add_insn (note); |
---|
2829 | return note; |
---|
2830 | } |
---|
2831 | |
---|
2832 | /* Emit a NOTE, and don't omit it even if LINE it the previous note. */ |
---|
2833 | |
---|
2834 | rtx |
---|
2835 | emit_line_note_force (file, line) |
---|
2836 | char *file; |
---|
2837 | int line; |
---|
2838 | { |
---|
2839 | last_linenum = -1; |
---|
2840 | return emit_line_note (file, line); |
---|
2841 | } |
---|
2842 | |
---|
2843 | /* Cause next statement to emit a line note even if the line number |
---|
2844 | has not changed. This is used at the beginning of a function. */ |
---|
2845 | |
---|
2846 | void |
---|
2847 | force_next_line_note () |
---|
2848 | { |
---|
2849 | last_linenum = -1; |
---|
2850 | } |
---|
2851 | |
---|
2852 | /* Return an indication of which type of insn should have X as a body. |
---|
2853 | The value is CODE_LABEL, INSN, CALL_INSN or JUMP_INSN. */ |
---|
2854 | |
---|
2855 | enum rtx_code |
---|
2856 | classify_insn (x) |
---|
2857 | rtx x; |
---|
2858 | { |
---|
2859 | if (GET_CODE (x) == CODE_LABEL) |
---|
2860 | return CODE_LABEL; |
---|
2861 | if (GET_CODE (x) == CALL) |
---|
2862 | return CALL_INSN; |
---|
2863 | if (GET_CODE (x) == RETURN) |
---|
2864 | return JUMP_INSN; |
---|
2865 | if (GET_CODE (x) == SET) |
---|
2866 | { |
---|
2867 | if (SET_DEST (x) == pc_rtx) |
---|
2868 | return JUMP_INSN; |
---|
2869 | else if (GET_CODE (SET_SRC (x)) == CALL) |
---|
2870 | return CALL_INSN; |
---|
2871 | else |
---|
2872 | return INSN; |
---|
2873 | } |
---|
2874 | if (GET_CODE (x) == PARALLEL) |
---|
2875 | { |
---|
2876 | register int j; |
---|
2877 | for (j = XVECLEN (x, 0) - 1; j >= 0; j--) |
---|
2878 | if (GET_CODE (XVECEXP (x, 0, j)) == CALL) |
---|
2879 | return CALL_INSN; |
---|
2880 | else if (GET_CODE (XVECEXP (x, 0, j)) == SET |
---|
2881 | && SET_DEST (XVECEXP (x, 0, j)) == pc_rtx) |
---|
2882 | return JUMP_INSN; |
---|
2883 | else if (GET_CODE (XVECEXP (x, 0, j)) == SET |
---|
2884 | && GET_CODE (SET_SRC (XVECEXP (x, 0, j))) == CALL) |
---|
2885 | return CALL_INSN; |
---|
2886 | } |
---|
2887 | return INSN; |
---|
2888 | } |
---|
2889 | |
---|
2890 | /* Emit the rtl pattern X as an appropriate kind of insn. |
---|
2891 | If X is a label, it is simply added into the insn chain. */ |
---|
2892 | |
---|
2893 | rtx |
---|
2894 | emit (x) |
---|
2895 | rtx x; |
---|
2896 | { |
---|
2897 | enum rtx_code code = classify_insn (x); |
---|
2898 | |
---|
2899 | if (code == CODE_LABEL) |
---|
2900 | return emit_label (x); |
---|
2901 | else if (code == INSN) |
---|
2902 | return emit_insn (x); |
---|
2903 | else if (code == JUMP_INSN) |
---|
2904 | { |
---|
2905 | register rtx insn = emit_jump_insn (x); |
---|
2906 | if (simplejump_p (insn) || GET_CODE (x) == RETURN) |
---|
2907 | return emit_barrier (); |
---|
2908 | return insn; |
---|
2909 | } |
---|
2910 | else if (code == CALL_INSN) |
---|
2911 | return emit_call_insn (x); |
---|
2912 | else |
---|
2913 | abort (); |
---|
2914 | } |
---|
2915 | |
---|
2916 | /* Begin emitting insns to a sequence which can be packaged in an RTL_EXPR. */ |
---|
2917 | |
---|
2918 | void |
---|
2919 | start_sequence () |
---|
2920 | { |
---|
2921 | struct sequence_stack *tem; |
---|
2922 | |
---|
2923 | if (sequence_element_free_list) |
---|
2924 | { |
---|
2925 | /* Reuse a previously-saved struct sequence_stack. */ |
---|
2926 | tem = sequence_element_free_list; |
---|
2927 | sequence_element_free_list = tem->next; |
---|
2928 | } |
---|
2929 | else |
---|
2930 | tem = (struct sequence_stack *) permalloc (sizeof (struct sequence_stack)); |
---|
2931 | |
---|
2932 | tem->next = sequence_stack; |
---|
2933 | tem->first = first_insn; |
---|
2934 | tem->last = last_insn; |
---|
2935 | tem->sequence_rtl_expr = sequence_rtl_expr; |
---|
2936 | |
---|
2937 | sequence_stack = tem; |
---|
2938 | |
---|
2939 | first_insn = 0; |
---|
2940 | last_insn = 0; |
---|
2941 | } |
---|
2942 | |
---|
2943 | /* Similarly, but indicate that this sequence will be placed in |
---|
2944 | T, an RTL_EXPR. */ |
---|
2945 | |
---|
2946 | void |
---|
2947 | start_sequence_for_rtl_expr (t) |
---|
2948 | tree t; |
---|
2949 | { |
---|
2950 | start_sequence (); |
---|
2951 | |
---|
2952 | sequence_rtl_expr = t; |
---|
2953 | } |
---|
2954 | |
---|
2955 | /* Set up the insn chain starting with FIRST |
---|
2956 | as the current sequence, saving the previously current one. */ |
---|
2957 | |
---|
2958 | void |
---|
2959 | push_to_sequence (first) |
---|
2960 | rtx first; |
---|
2961 | { |
---|
2962 | rtx last; |
---|
2963 | |
---|
2964 | start_sequence (); |
---|
2965 | |
---|
2966 | for (last = first; last && NEXT_INSN (last); last = NEXT_INSN (last)); |
---|
2967 | |
---|
2968 | first_insn = first; |
---|
2969 | last_insn = last; |
---|
2970 | } |
---|
2971 | |
---|
2972 | /* Set up the outer-level insn chain |
---|
2973 | as the current sequence, saving the previously current one. */ |
---|
2974 | |
---|
2975 | void |
---|
2976 | push_topmost_sequence () |
---|
2977 | { |
---|
2978 | struct sequence_stack *stack, *top; |
---|
2979 | |
---|
2980 | start_sequence (); |
---|
2981 | |
---|
2982 | for (stack = sequence_stack; stack; stack = stack->next) |
---|
2983 | top = stack; |
---|
2984 | |
---|
2985 | first_insn = top->first; |
---|
2986 | last_insn = top->last; |
---|
2987 | sequence_rtl_expr = top->sequence_rtl_expr; |
---|
2988 | } |
---|
2989 | |
---|
2990 | /* After emitting to the outer-level insn chain, update the outer-level |
---|
2991 | insn chain, and restore the previous saved state. */ |
---|
2992 | |
---|
2993 | void |
---|
2994 | pop_topmost_sequence () |
---|
2995 | { |
---|
2996 | struct sequence_stack *stack, *top; |
---|
2997 | |
---|
2998 | for (stack = sequence_stack; stack; stack = stack->next) |
---|
2999 | top = stack; |
---|
3000 | |
---|
3001 | top->first = first_insn; |
---|
3002 | top->last = last_insn; |
---|
3003 | /* ??? Why don't we save sequence_rtl_expr here? */ |
---|
3004 | |
---|
3005 | end_sequence (); |
---|
3006 | } |
---|
3007 | |
---|
3008 | /* After emitting to a sequence, restore previous saved state. |
---|
3009 | |
---|
3010 | To get the contents of the sequence just made, |
---|
3011 | you must call `gen_sequence' *before* calling here. */ |
---|
3012 | |
---|
3013 | void |
---|
3014 | end_sequence () |
---|
3015 | { |
---|
3016 | struct sequence_stack *tem = sequence_stack; |
---|
3017 | |
---|
3018 | first_insn = tem->first; |
---|
3019 | last_insn = tem->last; |
---|
3020 | sequence_rtl_expr = tem->sequence_rtl_expr; |
---|
3021 | sequence_stack = tem->next; |
---|
3022 | |
---|
3023 | tem->next = sequence_element_free_list; |
---|
3024 | sequence_element_free_list = tem; |
---|
3025 | } |
---|
3026 | |
---|
3027 | /* Return 1 if currently emitting into a sequence. */ |
---|
3028 | |
---|
3029 | int |
---|
3030 | in_sequence_p () |
---|
3031 | { |
---|
3032 | return sequence_stack != 0; |
---|
3033 | } |
---|
3034 | |
---|
3035 | /* Generate a SEQUENCE rtx containing the insns already emitted |
---|
3036 | to the current sequence. |
---|
3037 | |
---|
3038 | This is how the gen_... function from a DEFINE_EXPAND |
---|
3039 | constructs the SEQUENCE that it returns. */ |
---|
3040 | |
---|
3041 | rtx |
---|
3042 | gen_sequence () |
---|
3043 | { |
---|
3044 | rtx result; |
---|
3045 | rtx tem; |
---|
3046 | int i; |
---|
3047 | int len; |
---|
3048 | |
---|
3049 | /* Count the insns in the chain. */ |
---|
3050 | len = 0; |
---|
3051 | for (tem = first_insn; tem; tem = NEXT_INSN (tem)) |
---|
3052 | len++; |
---|
3053 | |
---|
3054 | /* If only one insn, return its pattern rather than a SEQUENCE. |
---|
3055 | (Now that we cache SEQUENCE expressions, it isn't worth special-casing |
---|
3056 | the case of an empty list.) */ |
---|
3057 | if (len == 1 |
---|
3058 | && (GET_CODE (first_insn) == INSN |
---|
3059 | || GET_CODE (first_insn) == JUMP_INSN |
---|
3060 | /* Don't discard the call usage field. */ |
---|
3061 | || (GET_CODE (first_insn) == CALL_INSN |
---|
3062 | && CALL_INSN_FUNCTION_USAGE (first_insn) == NULL_RTX))) |
---|
3063 | return PATTERN (first_insn); |
---|
3064 | |
---|
3065 | /* Put them in a vector. See if we already have a SEQUENCE of the |
---|
3066 | appropriate length around. */ |
---|
3067 | if (len < SEQUENCE_RESULT_SIZE && (result = sequence_result[len]) != 0) |
---|
3068 | sequence_result[len] = 0; |
---|
3069 | else |
---|
3070 | { |
---|
3071 | /* Ensure that this rtl goes in saveable_obstack, since we may |
---|
3072 | cache it. */ |
---|
3073 | push_obstacks_nochange (); |
---|
3074 | rtl_in_saveable_obstack (); |
---|
3075 | result = gen_rtx (SEQUENCE, VOIDmode, rtvec_alloc (len)); |
---|
3076 | pop_obstacks (); |
---|
3077 | } |
---|
3078 | |
---|
3079 | for (i = 0, tem = first_insn; tem; tem = NEXT_INSN (tem), i++) |
---|
3080 | XVECEXP (result, 0, i) = tem; |
---|
3081 | |
---|
3082 | return result; |
---|
3083 | } |
---|
3084 | |
---|
3085 | /* Set up regno_reg_rtx, reg_rtx_no and regno_pointer_flag |
---|
3086 | according to the chain of insns starting with FIRST. |
---|
3087 | |
---|
3088 | Also set cur_insn_uid to exceed the largest uid in that chain. |
---|
3089 | |
---|
3090 | This is used when an inline function's rtl is saved |
---|
3091 | and passed to rest_of_compilation later. */ |
---|
3092 | |
---|
3093 | static void restore_reg_data_1 (); |
---|
3094 | |
---|
3095 | void |
---|
3096 | restore_reg_data (first) |
---|
3097 | rtx first; |
---|
3098 | { |
---|
3099 | register rtx insn; |
---|
3100 | int i; |
---|
3101 | register int max_uid = 0; |
---|
3102 | |
---|
3103 | for (insn = first; insn; insn = NEXT_INSN (insn)) |
---|
3104 | { |
---|
3105 | if (INSN_UID (insn) >= max_uid) |
---|
3106 | max_uid = INSN_UID (insn); |
---|
3107 | |
---|
3108 | switch (GET_CODE (insn)) |
---|
3109 | { |
---|
3110 | case NOTE: |
---|
3111 | case CODE_LABEL: |
---|
3112 | case BARRIER: |
---|
3113 | break; |
---|
3114 | |
---|
3115 | case JUMP_INSN: |
---|
3116 | case CALL_INSN: |
---|
3117 | case INSN: |
---|
3118 | restore_reg_data_1 (PATTERN (insn)); |
---|
3119 | break; |
---|
3120 | } |
---|
3121 | } |
---|
3122 | |
---|
3123 | /* Don't duplicate the uids already in use. */ |
---|
3124 | cur_insn_uid = max_uid + 1; |
---|
3125 | |
---|
3126 | /* If any regs are missing, make them up. |
---|
3127 | |
---|
3128 | ??? word_mode is not necessarily the right mode. Most likely these REGs |
---|
3129 | are never used. At some point this should be checked. */ |
---|
3130 | |
---|
3131 | for (i = FIRST_PSEUDO_REGISTER; i < reg_rtx_no; i++) |
---|
3132 | if (regno_reg_rtx[i] == 0) |
---|
3133 | regno_reg_rtx[i] = gen_rtx (REG, word_mode, i); |
---|
3134 | } |
---|
3135 | |
---|
3136 | static void |
---|
3137 | restore_reg_data_1 (orig) |
---|
3138 | rtx orig; |
---|
3139 | { |
---|
3140 | register rtx x = orig; |
---|
3141 | register int i; |
---|
3142 | register enum rtx_code code; |
---|
3143 | register char *format_ptr; |
---|
3144 | |
---|
3145 | code = GET_CODE (x); |
---|
3146 | |
---|
3147 | switch (code) |
---|
3148 | { |
---|
3149 | case QUEUED: |
---|
3150 | case CONST_INT: |
---|
3151 | case CONST_DOUBLE: |
---|
3152 | case SYMBOL_REF: |
---|
3153 | case CODE_LABEL: |
---|
3154 | case PC: |
---|
3155 | case CC0: |
---|
3156 | case LABEL_REF: |
---|
3157 | return; |
---|
3158 | |
---|
3159 | case REG: |
---|
3160 | if (REGNO (x) >= FIRST_PSEUDO_REGISTER) |
---|
3161 | { |
---|
3162 | /* Make sure regno_pointer_flag and regno_reg_rtx are large |
---|
3163 | enough to have an element for this pseudo reg number. */ |
---|
3164 | if (REGNO (x) >= reg_rtx_no) |
---|
3165 | { |
---|
3166 | reg_rtx_no = REGNO (x); |
---|
3167 | |
---|
3168 | if (reg_rtx_no >= regno_pointer_flag_length) |
---|
3169 | { |
---|
3170 | int newlen = MAX (regno_pointer_flag_length * 2, |
---|
3171 | reg_rtx_no + 30); |
---|
3172 | rtx *new1; |
---|
3173 | char *new = (char *) oballoc (newlen); |
---|
3174 | bzero (new, newlen); |
---|
3175 | bcopy (regno_pointer_flag, new, regno_pointer_flag_length); |
---|
3176 | |
---|
3177 | new1 = (rtx *) oballoc (newlen * sizeof (rtx)); |
---|
3178 | bzero ((char *) new1, newlen * sizeof (rtx)); |
---|
3179 | bcopy ((char *) regno_reg_rtx, (char *) new1, |
---|
3180 | regno_pointer_flag_length * sizeof (rtx)); |
---|
3181 | |
---|
3182 | regno_pointer_flag = new; |
---|
3183 | regno_reg_rtx = new1; |
---|
3184 | regno_pointer_flag_length = newlen; |
---|
3185 | } |
---|
3186 | reg_rtx_no ++; |
---|
3187 | } |
---|
3188 | regno_reg_rtx[REGNO (x)] = x; |
---|
3189 | } |
---|
3190 | return; |
---|
3191 | |
---|
3192 | case MEM: |
---|
3193 | if (GET_CODE (XEXP (x, 0)) == REG) |
---|
3194 | mark_reg_pointer (XEXP (x, 0)); |
---|
3195 | restore_reg_data_1 (XEXP (x, 0)); |
---|
3196 | return; |
---|
3197 | } |
---|
3198 | |
---|
3199 | /* Now scan the subexpressions recursively. */ |
---|
3200 | |
---|
3201 | format_ptr = GET_RTX_FORMAT (code); |
---|
3202 | |
---|
3203 | for (i = 0; i < GET_RTX_LENGTH (code); i++) |
---|
3204 | { |
---|
3205 | switch (*format_ptr++) |
---|
3206 | { |
---|
3207 | case 'e': |
---|
3208 | restore_reg_data_1 (XEXP (x, i)); |
---|
3209 | break; |
---|
3210 | |
---|
3211 | case 'E': |
---|
3212 | if (XVEC (x, i) != NULL) |
---|
3213 | { |
---|
3214 | register int j; |
---|
3215 | |
---|
3216 | for (j = 0; j < XVECLEN (x, i); j++) |
---|
3217 | restore_reg_data_1 (XVECEXP (x, i, j)); |
---|
3218 | } |
---|
3219 | break; |
---|
3220 | } |
---|
3221 | } |
---|
3222 | } |
---|
3223 | |
---|
3224 | /* Initialize data structures and variables in this file |
---|
3225 | before generating rtl for each function. */ |
---|
3226 | |
---|
3227 | void |
---|
3228 | init_emit () |
---|
3229 | { |
---|
3230 | int i; |
---|
3231 | |
---|
3232 | first_insn = NULL; |
---|
3233 | last_insn = NULL; |
---|
3234 | sequence_rtl_expr = NULL; |
---|
3235 | cur_insn_uid = 1; |
---|
3236 | reg_rtx_no = LAST_VIRTUAL_REGISTER + 1; |
---|
3237 | last_linenum = 0; |
---|
3238 | last_filename = 0; |
---|
3239 | first_label_num = label_num; |
---|
3240 | last_label_num = 0; |
---|
3241 | sequence_stack = NULL; |
---|
3242 | |
---|
3243 | /* Clear the start_sequence/gen_sequence cache. */ |
---|
3244 | sequence_element_free_list = 0; |
---|
3245 | for (i = 0; i < SEQUENCE_RESULT_SIZE; i++) |
---|
3246 | sequence_result[i] = 0; |
---|
3247 | |
---|
3248 | /* Init the tables that describe all the pseudo regs. */ |
---|
3249 | |
---|
3250 | regno_pointer_flag_length = LAST_VIRTUAL_REGISTER + 101; |
---|
3251 | |
---|
3252 | regno_pointer_flag |
---|
3253 | = (char *) oballoc (regno_pointer_flag_length); |
---|
3254 | bzero (regno_pointer_flag, regno_pointer_flag_length); |
---|
3255 | |
---|
3256 | regno_reg_rtx |
---|
3257 | = (rtx *) oballoc (regno_pointer_flag_length * sizeof (rtx)); |
---|
3258 | bzero ((char *) regno_reg_rtx, regno_pointer_flag_length * sizeof (rtx)); |
---|
3259 | |
---|
3260 | /* Put copies of all the virtual register rtx into regno_reg_rtx. */ |
---|
3261 | regno_reg_rtx[VIRTUAL_INCOMING_ARGS_REGNUM] = virtual_incoming_args_rtx; |
---|
3262 | regno_reg_rtx[VIRTUAL_STACK_VARS_REGNUM] = virtual_stack_vars_rtx; |
---|
3263 | regno_reg_rtx[VIRTUAL_STACK_DYNAMIC_REGNUM] = virtual_stack_dynamic_rtx; |
---|
3264 | regno_reg_rtx[VIRTUAL_OUTGOING_ARGS_REGNUM] = virtual_outgoing_args_rtx; |
---|
3265 | |
---|
3266 | /* Indicate that the virtual registers and stack locations are |
---|
3267 | all pointers. */ |
---|
3268 | REGNO_POINTER_FLAG (STACK_POINTER_REGNUM) = 1; |
---|
3269 | REGNO_POINTER_FLAG (FRAME_POINTER_REGNUM) = 1; |
---|
3270 | REGNO_POINTER_FLAG (HARD_FRAME_POINTER_REGNUM) = 1; |
---|
3271 | REGNO_POINTER_FLAG (ARG_POINTER_REGNUM) = 1; |
---|
3272 | |
---|
3273 | REGNO_POINTER_FLAG (VIRTUAL_INCOMING_ARGS_REGNUM) = 1; |
---|
3274 | REGNO_POINTER_FLAG (VIRTUAL_STACK_VARS_REGNUM) = 1; |
---|
3275 | REGNO_POINTER_FLAG (VIRTUAL_STACK_DYNAMIC_REGNUM) = 1; |
---|
3276 | REGNO_POINTER_FLAG (VIRTUAL_OUTGOING_ARGS_REGNUM) = 1; |
---|
3277 | |
---|
3278 | #ifdef INIT_EXPANDERS |
---|
3279 | INIT_EXPANDERS; |
---|
3280 | #endif |
---|
3281 | } |
---|
3282 | |
---|
3283 | /* Create some permanent unique rtl objects shared between all functions. |
---|
3284 | LINE_NUMBERS is nonzero if line numbers are to be generated. */ |
---|
3285 | |
---|
3286 | void |
---|
3287 | init_emit_once (line_numbers) |
---|
3288 | int line_numbers; |
---|
3289 | { |
---|
3290 | int i; |
---|
3291 | enum machine_mode mode; |
---|
3292 | |
---|
3293 | no_line_numbers = ! line_numbers; |
---|
3294 | |
---|
3295 | sequence_stack = NULL; |
---|
3296 | |
---|
3297 | /* Compute the word and byte modes. */ |
---|
3298 | |
---|
3299 | byte_mode = VOIDmode; |
---|
3300 | word_mode = VOIDmode; |
---|
3301 | |
---|
3302 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode; |
---|
3303 | mode = GET_MODE_WIDER_MODE (mode)) |
---|
3304 | { |
---|
3305 | if (GET_MODE_BITSIZE (mode) == BITS_PER_UNIT |
---|
3306 | && byte_mode == VOIDmode) |
---|
3307 | byte_mode = mode; |
---|
3308 | |
---|
3309 | if (GET_MODE_BITSIZE (mode) == BITS_PER_WORD |
---|
3310 | && word_mode == VOIDmode) |
---|
3311 | word_mode = mode; |
---|
3312 | } |
---|
3313 | |
---|
3314 | ptr_mode = mode_for_size (POINTER_SIZE, GET_MODE_CLASS (Pmode), 0); |
---|
3315 | |
---|
3316 | /* Create the unique rtx's for certain rtx codes and operand values. */ |
---|
3317 | |
---|
3318 | pc_rtx = gen_rtx (PC, VOIDmode); |
---|
3319 | cc0_rtx = gen_rtx (CC0, VOIDmode); |
---|
3320 | |
---|
3321 | /* Don't use gen_rtx here since gen_rtx in this case |
---|
3322 | tries to use these variables. */ |
---|
3323 | for (i = - MAX_SAVED_CONST_INT; i <= MAX_SAVED_CONST_INT; i++) |
---|
3324 | { |
---|
3325 | const_int_rtx[i + MAX_SAVED_CONST_INT] = rtx_alloc (CONST_INT); |
---|
3326 | PUT_MODE (const_int_rtx[i + MAX_SAVED_CONST_INT], VOIDmode); |
---|
3327 | INTVAL (const_int_rtx[i + MAX_SAVED_CONST_INT]) = i; |
---|
3328 | } |
---|
3329 | |
---|
3330 | /* These four calls obtain some of the rtx expressions made above. */ |
---|
3331 | const0_rtx = GEN_INT (0); |
---|
3332 | const1_rtx = GEN_INT (1); |
---|
3333 | const2_rtx = GEN_INT (2); |
---|
3334 | constm1_rtx = GEN_INT (-1); |
---|
3335 | |
---|
3336 | /* This will usually be one of the above constants, but may be a new rtx. */ |
---|
3337 | const_true_rtx = GEN_INT (STORE_FLAG_VALUE); |
---|
3338 | |
---|
3339 | dconst0 = REAL_VALUE_ATOF ("0", DFmode); |
---|
3340 | dconst1 = REAL_VALUE_ATOF ("1", DFmode); |
---|
3341 | dconst2 = REAL_VALUE_ATOF ("2", DFmode); |
---|
3342 | dconstm1 = REAL_VALUE_ATOF ("-1", DFmode); |
---|
3343 | |
---|
3344 | for (i = 0; i <= 2; i++) |
---|
3345 | { |
---|
3346 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode; |
---|
3347 | mode = GET_MODE_WIDER_MODE (mode)) |
---|
3348 | { |
---|
3349 | rtx tem = rtx_alloc (CONST_DOUBLE); |
---|
3350 | union real_extract u; |
---|
3351 | |
---|
3352 | bzero ((char *) &u, sizeof u); /* Zero any holes in a structure. */ |
---|
3353 | u.d = i == 0 ? dconst0 : i == 1 ? dconst1 : dconst2; |
---|
3354 | |
---|
3355 | bcopy ((char *) &u, (char *) &CONST_DOUBLE_LOW (tem), sizeof u); |
---|
3356 | CONST_DOUBLE_MEM (tem) = cc0_rtx; |
---|
3357 | PUT_MODE (tem, mode); |
---|
3358 | |
---|
3359 | const_tiny_rtx[i][(int) mode] = tem; |
---|
3360 | } |
---|
3361 | |
---|
3362 | const_tiny_rtx[i][(int) VOIDmode] = GEN_INT (i); |
---|
3363 | |
---|
3364 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode; |
---|
3365 | mode = GET_MODE_WIDER_MODE (mode)) |
---|
3366 | const_tiny_rtx[i][(int) mode] = GEN_INT (i); |
---|
3367 | |
---|
3368 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_PARTIAL_INT); |
---|
3369 | mode != VOIDmode; |
---|
3370 | mode = GET_MODE_WIDER_MODE (mode)) |
---|
3371 | const_tiny_rtx[i][(int) mode] = GEN_INT (i); |
---|
3372 | } |
---|
3373 | |
---|
3374 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_CC); mode != VOIDmode; |
---|
3375 | mode = GET_MODE_WIDER_MODE (mode)) |
---|
3376 | const_tiny_rtx[0][(int) mode] = const0_rtx; |
---|
3377 | |
---|
3378 | stack_pointer_rtx = gen_rtx (REG, Pmode, STACK_POINTER_REGNUM); |
---|
3379 | frame_pointer_rtx = gen_rtx (REG, Pmode, FRAME_POINTER_REGNUM); |
---|
3380 | |
---|
3381 | if (HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM) |
---|
3382 | hard_frame_pointer_rtx = frame_pointer_rtx; |
---|
3383 | else |
---|
3384 | hard_frame_pointer_rtx = gen_rtx (REG, Pmode, HARD_FRAME_POINTER_REGNUM); |
---|
3385 | |
---|
3386 | if (FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM) |
---|
3387 | arg_pointer_rtx = frame_pointer_rtx; |
---|
3388 | else if (HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM) |
---|
3389 | arg_pointer_rtx = hard_frame_pointer_rtx; |
---|
3390 | else if (STACK_POINTER_REGNUM == ARG_POINTER_REGNUM) |
---|
3391 | arg_pointer_rtx = stack_pointer_rtx; |
---|
3392 | else |
---|
3393 | arg_pointer_rtx = gen_rtx (REG, Pmode, ARG_POINTER_REGNUM); |
---|
3394 | |
---|
3395 | /* Create the virtual registers. Do so here since the following objects |
---|
3396 | might reference them. */ |
---|
3397 | |
---|
3398 | virtual_incoming_args_rtx = gen_rtx (REG, Pmode, |
---|
3399 | VIRTUAL_INCOMING_ARGS_REGNUM); |
---|
3400 | virtual_stack_vars_rtx = gen_rtx (REG, Pmode, |
---|
3401 | VIRTUAL_STACK_VARS_REGNUM); |
---|
3402 | virtual_stack_dynamic_rtx = gen_rtx (REG, Pmode, |
---|
3403 | VIRTUAL_STACK_DYNAMIC_REGNUM); |
---|
3404 | virtual_outgoing_args_rtx = gen_rtx (REG, Pmode, |
---|
3405 | VIRTUAL_OUTGOING_ARGS_REGNUM); |
---|
3406 | |
---|
3407 | #ifdef STRUCT_VALUE |
---|
3408 | struct_value_rtx = STRUCT_VALUE; |
---|
3409 | #else |
---|
3410 | struct_value_rtx = gen_rtx (REG, Pmode, STRUCT_VALUE_REGNUM); |
---|
3411 | #endif |
---|
3412 | |
---|
3413 | #ifdef STRUCT_VALUE_INCOMING |
---|
3414 | struct_value_incoming_rtx = STRUCT_VALUE_INCOMING; |
---|
3415 | #else |
---|
3416 | #ifdef STRUCT_VALUE_INCOMING_REGNUM |
---|
3417 | struct_value_incoming_rtx |
---|
3418 | = gen_rtx (REG, Pmode, STRUCT_VALUE_INCOMING_REGNUM); |
---|
3419 | #else |
---|
3420 | struct_value_incoming_rtx = struct_value_rtx; |
---|
3421 | #endif |
---|
3422 | #endif |
---|
3423 | |
---|
3424 | #ifdef STATIC_CHAIN_REGNUM |
---|
3425 | static_chain_rtx = gen_rtx (REG, Pmode, STATIC_CHAIN_REGNUM); |
---|
3426 | |
---|
3427 | #ifdef STATIC_CHAIN_INCOMING_REGNUM |
---|
3428 | if (STATIC_CHAIN_INCOMING_REGNUM != STATIC_CHAIN_REGNUM) |
---|
3429 | static_chain_incoming_rtx = gen_rtx (REG, Pmode, STATIC_CHAIN_INCOMING_REGNUM); |
---|
3430 | else |
---|
3431 | #endif |
---|
3432 | static_chain_incoming_rtx = static_chain_rtx; |
---|
3433 | #endif |
---|
3434 | |
---|
3435 | #ifdef STATIC_CHAIN |
---|
3436 | static_chain_rtx = STATIC_CHAIN; |
---|
3437 | |
---|
3438 | #ifdef STATIC_CHAIN_INCOMING |
---|
3439 | static_chain_incoming_rtx = STATIC_CHAIN_INCOMING; |
---|
3440 | #else |
---|
3441 | static_chain_incoming_rtx = static_chain_rtx; |
---|
3442 | #endif |
---|
3443 | #endif |
---|
3444 | |
---|
3445 | #ifdef PIC_OFFSET_TABLE_REGNUM |
---|
3446 | pic_offset_table_rtx = gen_rtx (REG, Pmode, PIC_OFFSET_TABLE_REGNUM); |
---|
3447 | #endif |
---|
3448 | } |
---|