1 | /* Register Transfer Language (RTL) definitions for GNU C-Compiler |
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2 | Copyright (C) 1987, 91, 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 | #include "machmode.h" |
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23 | |
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24 | #undef FFS /* Some systems predefine this symbol; don't let it interfere. */ |
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25 | #undef FLOAT /* Likewise. */ |
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26 | #undef ABS /* Likewise. */ |
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27 | #undef PC /* Likewise. */ |
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28 | |
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29 | #ifndef TREE_CODE |
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30 | union tree_node; |
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31 | #endif |
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32 | |
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33 | /* Register Transfer Language EXPRESSIONS CODES */ |
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34 | |
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35 | #define RTX_CODE enum rtx_code |
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36 | enum rtx_code { |
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37 | |
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38 | #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM , |
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39 | #include "rtl.def" /* rtl expressions are documented here */ |
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40 | #undef DEF_RTL_EXPR |
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41 | |
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42 | LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for |
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43 | NUM_RTX_CODE. |
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44 | Assumes default enum value assignment. */ |
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45 | |
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46 | #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE) |
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47 | /* The cast here, saves many elsewhere. */ |
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48 | |
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49 | extern int rtx_length[]; |
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50 | #define GET_RTX_LENGTH(CODE) (rtx_length[(int)(CODE)]) |
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51 | |
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52 | extern char *rtx_name[]; |
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53 | #define GET_RTX_NAME(CODE) (rtx_name[(int)(CODE)]) |
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54 | |
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55 | extern char *rtx_format[]; |
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56 | #define GET_RTX_FORMAT(CODE) (rtx_format[(int)(CODE)]) |
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57 | |
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58 | extern char rtx_class[]; |
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59 | #define GET_RTX_CLASS(CODE) (rtx_class[(int)(CODE)]) |
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60 | |
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61 | /* Common union for an element of an rtx. */ |
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62 | |
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63 | typedef union rtunion_def |
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64 | { |
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65 | HOST_WIDE_INT rtwint; |
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66 | int rtint; |
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67 | char *rtstr; |
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68 | struct rtx_def *rtx; |
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69 | struct rtvec_def *rtvec; |
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70 | enum machine_mode rttype; |
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71 | } rtunion; |
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72 | |
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73 | /* RTL expression ("rtx"). */ |
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74 | |
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75 | typedef struct rtx_def |
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76 | { |
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77 | #ifdef ONLY_INT_FIELDS |
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78 | #ifdef CODE_FIELD_BUG |
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79 | unsigned int code : 16; |
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80 | #else |
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81 | unsigned short code; |
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82 | #endif |
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83 | #else |
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84 | /* The kind of expression this is. */ |
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85 | enum rtx_code code : 16; |
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86 | #endif |
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87 | /* The kind of value the expression has. */ |
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88 | #ifdef ONLY_INT_FIELDS |
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89 | int mode : 8; |
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90 | #else |
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91 | enum machine_mode mode : 8; |
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92 | #endif |
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93 | /* 1 in an INSN if it can alter flow of control |
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94 | within this function. Not yet used! */ |
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95 | unsigned int jump : 1; |
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96 | /* 1 in an INSN if it can call another function. Not yet used! */ |
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97 | unsigned int call : 1; |
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98 | /* 1 in a MEM or REG if value of this expression will never change |
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99 | during the current function, even though it is not |
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100 | manifestly constant. |
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101 | 1 in a SUBREG if it is from a promoted variable that is unsigned. |
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102 | 1 in a SYMBOL_REF if it addresses something in the per-function |
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103 | constants pool. |
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104 | 1 in a CALL_INSN if it is a const call. |
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105 | 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from |
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106 | reorg until end of compilation; cleared before used. */ |
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107 | unsigned int unchanging : 1; |
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108 | /* 1 in a MEM expression if contents of memory are volatile. |
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109 | 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER |
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110 | if it is deleted. |
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111 | 1 in a REG expression if corresponds to a variable declared by the user. |
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112 | 0 for an internally generated temporary. |
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113 | In a SYMBOL_REF, this flag is used for machine-specific purposes. |
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114 | In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */ |
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115 | unsigned int volatil : 1; |
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116 | /* 1 in a MEM referring to a field of a structure (not a union!). |
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117 | 0 if the MEM was a variable or the result of a * operator in C; |
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118 | 1 if it was the result of a . or -> operator (on a struct) in C. |
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119 | 1 in a REG if the register is used only in exit code a loop. |
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120 | 1 in a SUBREG expression if was generated from a variable with a |
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121 | promoted mode. |
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122 | 1 in a CODE_LABEL if the label is used for nonlocal gotos |
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123 | and must not be deleted even if its count is zero. |
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124 | 1 in a LABEL_REF if this is a reference to a label outside the |
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125 | current loop. |
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126 | 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled |
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127 | together with the preceding insn. Valid only within sched. |
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128 | 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and |
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129 | from the target of a branch. Valid from reorg until end of compilation; |
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130 | cleared before used. */ |
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131 | unsigned int in_struct : 1; |
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132 | /* 1 if this rtx is used. This is used for copying shared structure. |
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133 | See `unshare_all_rtl'. |
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134 | In a REG, this is not needed for that purpose, and used instead |
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135 | in `leaf_renumber_regs_insn'. |
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136 | In a SYMBOL_REF, means that emit_library_call |
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137 | has used it as the function. */ |
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138 | unsigned int used : 1; |
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139 | /* Nonzero if this rtx came from procedure integration. |
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140 | In a REG, nonzero means this reg refers to the return value |
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141 | of the current function. */ |
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142 | unsigned integrated : 1; |
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143 | /* The first element of the operands of this rtx. |
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144 | The number of operands and their types are controlled |
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145 | by the `code' field, according to rtl.def. */ |
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146 | rtunion fld[1]; |
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147 | } *rtx; |
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148 | |
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149 | |
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150 | /* Add prototype support. */ |
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151 | #ifndef PROTO |
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152 | #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__) |
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153 | #define PROTO(ARGS) ARGS |
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154 | #else |
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155 | #define PROTO(ARGS) () |
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156 | #endif |
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157 | #endif |
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158 | |
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159 | #ifndef VPROTO |
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160 | #ifdef __STDC__ |
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161 | #define PVPROTO(ARGS) ARGS |
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162 | #define VPROTO(ARGS) ARGS |
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163 | #define VA_START(va_list,var) va_start(va_list,var) |
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164 | #else |
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165 | #define PVPROTO(ARGS) () |
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166 | #define VPROTO(ARGS) (va_alist) va_dcl |
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167 | #define VA_START(va_list,var) va_start(va_list) |
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168 | #endif |
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169 | #endif |
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170 | |
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171 | #ifndef STDIO_PROTO |
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172 | #ifdef BUFSIZ |
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173 | #define STDIO_PROTO(ARGS) PROTO(ARGS) |
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174 | #else |
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175 | #define STDIO_PROTO(ARGS) () |
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176 | #endif |
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177 | #endif |
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178 | |
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179 | #define NULL_RTX (rtx) 0 |
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180 | |
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181 | /* Define a generic NULL if one hasn't already been defined. */ |
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182 | |
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183 | #ifndef NULL |
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184 | #define NULL 0 |
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185 | #endif |
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186 | |
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187 | #ifndef GENERIC_PTR |
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188 | #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__) |
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189 | #define GENERIC_PTR void * |
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190 | #else |
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191 | #define GENERIC_PTR char * |
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192 | #endif |
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193 | #endif |
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194 | |
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195 | #ifndef NULL_PTR |
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196 | #define NULL_PTR ((GENERIC_PTR)0) |
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197 | #endif |
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198 | |
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199 | /* Define macros to access the `code' field of the rtx. */ |
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200 | |
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201 | #ifdef SHORT_ENUM_BUG |
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202 | #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code)) |
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203 | #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE))) |
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204 | #else |
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205 | #define GET_CODE(RTX) ((RTX)->code) |
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206 | #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE)) |
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207 | #endif |
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208 | |
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209 | #define GET_MODE(RTX) ((RTX)->mode) |
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210 | #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE)) |
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211 | |
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212 | #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated) |
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213 | #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging) |
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214 | |
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215 | /* RTL vector. These appear inside RTX's when there is a need |
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216 | for a variable number of things. The principle use is inside |
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217 | PARALLEL expressions. */ |
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218 | |
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219 | typedef struct rtvec_def{ |
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220 | unsigned num_elem; /* number of elements */ |
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221 | rtunion elem[1]; |
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222 | } *rtvec; |
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223 | |
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224 | #define NULL_RTVEC (rtvec) 0 |
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225 | |
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226 | #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem) |
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227 | #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM) |
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228 | |
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229 | #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx) |
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230 | |
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231 | /* 1 if X is a REG. */ |
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232 | |
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233 | #define REG_P(X) (GET_CODE (X) == REG) |
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234 | |
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235 | /* 1 if X is a constant value that is an integer. */ |
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236 | |
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237 | #define CONSTANT_P(X) \ |
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238 | (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \ |
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239 | || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \ |
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240 | || GET_CODE (X) == CONST || GET_CODE (X) == HIGH) |
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241 | |
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242 | /* General accessor macros for accessing the fields of an rtx. */ |
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243 | |
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244 | #define XEXP(RTX, N) ((RTX)->fld[N].rtx) |
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245 | #define XINT(RTX, N) ((RTX)->fld[N].rtint) |
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246 | #define XWINT(RTX, N) ((RTX)->fld[N].rtwint) |
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247 | #define XSTR(RTX, N) ((RTX)->fld[N].rtstr) |
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248 | #define XVEC(RTX, N) ((RTX)->fld[N].rtvec) |
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249 | #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem) |
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250 | #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx) |
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251 | |
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252 | /* ACCESS MACROS for particular fields of insns. */ |
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253 | |
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254 | /* Holds a unique number for each insn. |
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255 | These are not necessarily sequentially increasing. */ |
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256 | #define INSN_UID(INSN) ((INSN)->fld[0].rtint) |
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257 | |
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258 | /* Chain insns together in sequence. */ |
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259 | #define PREV_INSN(INSN) ((INSN)->fld[1].rtx) |
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260 | #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx) |
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261 | |
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262 | /* The body of an insn. */ |
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263 | #define PATTERN(INSN) ((INSN)->fld[3].rtx) |
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264 | |
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265 | /* Code number of instruction, from when it was recognized. |
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266 | -1 means this instruction has not been recognized yet. */ |
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267 | #define INSN_CODE(INSN) ((INSN)->fld[4].rtint) |
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268 | |
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269 | /* Set up in flow.c; empty before then. |
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270 | Holds a chain of INSN_LIST rtx's whose first operands point at |
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271 | previous insns with direct data-flow connections to this one. |
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272 | That means that those insns set variables whose next use is in this insn. |
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273 | They are always in the same basic block as this insn. */ |
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274 | #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx) |
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275 | |
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276 | /* 1 if insn has been deleted. */ |
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277 | #define INSN_DELETED_P(INSN) ((INSN)->volatil) |
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278 | |
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279 | /* 1 if insn is a call to a const function. */ |
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280 | #define CONST_CALL_P(INSN) ((INSN)->unchanging) |
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281 | |
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282 | /* 1 if insn is a branch that should not unconditionally execute its |
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283 | delay slots, i.e., it is an annulled branch. */ |
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284 | #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging) |
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285 | |
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286 | /* 1 if insn is in a delay slot and is from the target of the branch. If |
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287 | the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be |
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288 | executed if the branch is taken. For annulled branches with this bit |
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289 | clear, the insn should be executed only if the branch is not taken. */ |
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290 | #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct) |
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291 | |
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292 | /* Holds a list of notes on what this insn does to various REGs. |
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293 | It is a chain of EXPR_LIST rtx's, where the second operand |
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294 | is the chain pointer and the first operand is the REG being described. |
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295 | The mode field of the EXPR_LIST contains not a real machine mode |
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296 | but a value that says what this note says about the REG: |
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297 | REG_DEAD means that the value in REG dies in this insn (i.e., it is |
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298 | not needed past this insn). If REG is set in this insn, the REG_DEAD |
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299 | note may, but need not, be omitted. |
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300 | REG_INC means that the REG is autoincremented or autodecremented. |
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301 | REG_EQUIV describes the insn as a whole; it says that the |
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302 | insn sets a register to a constant value or to be equivalent to |
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303 | a memory address. If the |
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304 | register is spilled to the stack then the constant value |
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305 | should be substituted for it. The contents of the REG_EQUIV |
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306 | is the constant value or memory address, which may be different |
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307 | from the source of the SET although it has the same value. |
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308 | REG_EQUAL is like REG_EQUIV except that the destination |
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309 | is only momentarily equal to the specified rtx. Therefore, it |
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310 | cannot be used for substitution; but it can be used for cse. |
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311 | REG_RETVAL means that this insn copies the return-value of |
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312 | a library call out of the hard reg for return values. This note |
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313 | is actually an INSN_LIST and it points to the first insn involved |
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314 | in setting up arguments for the call. flow.c uses this to delete |
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315 | the entire library call when its result is dead. |
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316 | REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn |
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317 | of the library call and points at the one that has the REG_RETVAL. |
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318 | REG_WAS_0 says that the register set in this insn held 0 before the insn. |
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319 | The contents of the note is the insn that stored the 0. |
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320 | If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative. |
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321 | The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST. |
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322 | REG_NONNEG means that the register is always nonnegative during |
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323 | the containing loop. This is used in branches so that decrement and |
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324 | branch instructions terminating on zero can be matched. There must be |
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325 | an insn pattern in the md file named `decrement_and_branch_until_zero' |
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326 | or else this will never be added to any instructions. |
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327 | REG_NO_CONFLICT means there is no conflict *after this insn* |
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328 | between the register in the note and the destination of this insn. |
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329 | REG_UNUSED identifies a register set in this insn and never used. |
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330 | REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use |
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331 | CC0, respectively. Normally, these are required to be consecutive insns, |
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332 | but we permit putting a cc0-setting insn in the delay slot of a branch |
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333 | as long as only one copy of the insn exists. In that case, these notes |
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334 | point from one to the other to allow code generation to determine what |
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335 | any require information and to properly update CC_STATUS. |
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336 | REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to |
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337 | say that the CODE_LABEL contained in the REG_LABEL note is used |
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338 | by the insn. |
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339 | REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read) |
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340 | dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output |
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341 | (write after write) dependencies. Data dependencies, which are the only |
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342 | type of LOG_LINK created by flow, are represented by a 0 reg note kind. */ |
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343 | |
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344 | #define REG_NOTES(INSN) ((INSN)->fld[6].rtx) |
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345 | |
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346 | /* Don't forget to change reg_note_name in rtl.c. */ |
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347 | enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4, |
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348 | REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7, |
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349 | REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10, |
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350 | REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13, |
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351 | REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 }; |
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352 | |
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353 | /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */ |
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354 | #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK)) |
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355 | #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND)) |
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356 | |
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357 | /* Names for REG_NOTE's in EXPR_LIST insn's. */ |
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358 | |
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359 | extern char *reg_note_name[]; |
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360 | #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)]) |
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361 | |
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362 | /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of |
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363 | USE and CLOBBER expressions. |
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364 | USE expressions list the registers filled with arguments that |
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365 | are passed to the function. |
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366 | CLOBBER expressions document the registers explicitly clobbered |
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367 | by this CALL_INSN. |
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368 | Pseudo registers can not be mentioned in this list. */ |
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369 | #define CALL_INSN_FUNCTION_USAGE(INSN) ((INSN)->fld[7].rtx) |
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370 | |
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371 | /* The label-number of a code-label. The assembler label |
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372 | is made from `L' and the label-number printed in decimal. |
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373 | Label numbers are unique in a compilation. */ |
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374 | #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint) |
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375 | |
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376 | #define LINE_NUMBER NOTE |
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377 | |
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378 | /* In a NOTE that is a line number, this is a string for the file name |
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379 | that the line is in. We use the same field to record block numbers |
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380 | temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. |
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381 | (We avoid lots of casts between ints and pointers if we use a |
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382 | different macro for the bock number.) */ |
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383 | |
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384 | #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr) |
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385 | #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint) |
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386 | |
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387 | /* In a NOTE that is a line number, this is the line number. |
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388 | Other kinds of NOTEs are identified by negative numbers here. */ |
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389 | #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint) |
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390 | |
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391 | /* Codes that appear in the NOTE_LINE_NUMBER field |
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392 | for kinds of notes that are not line numbers. |
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393 | |
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394 | Notice that we do not try to use zero here for any of |
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395 | the special note codes because sometimes the source line |
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396 | actually can be zero! This happens (for example) when we |
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397 | are generating code for the per-translation-unit constructor |
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398 | and destructor routines for some C++ translation unit. |
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399 | |
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400 | If you should change any of the following values, or if you |
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401 | should add a new value here, don't forget to change the |
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402 | note_insn_name array in rtl.c. */ |
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403 | |
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404 | /* This note is used to get rid of an insn |
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405 | when it isn't safe to patch the insn out of the chain. */ |
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406 | #define NOTE_INSN_DELETED -1 |
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407 | #define NOTE_INSN_BLOCK_BEG -2 |
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408 | #define NOTE_INSN_BLOCK_END -3 |
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409 | #define NOTE_INSN_LOOP_BEG -4 |
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410 | #define NOTE_INSN_LOOP_END -5 |
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411 | /* This kind of note is generated at the end of the function body, |
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412 | just before the return insn or return label. |
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413 | In an optimizing compilation it is deleted by the first jump optimization, |
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414 | after enabling that optimizer to determine whether control can fall |
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415 | off the end of the function body without a return statement. */ |
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416 | #define NOTE_INSN_FUNCTION_END -6 |
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417 | /* This kind of note is generated just after each call to `setjmp', et al. */ |
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418 | #define NOTE_INSN_SETJMP -7 |
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419 | /* Generated at the place in a loop that `continue' jumps to. */ |
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420 | #define NOTE_INSN_LOOP_CONT -8 |
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421 | /* Generated at the start of a duplicated exit test. */ |
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422 | #define NOTE_INSN_LOOP_VTOP -9 |
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423 | /* This marks the point immediately after the last prologue insn. */ |
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424 | #define NOTE_INSN_PROLOGUE_END -10 |
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425 | /* This marks the point immediately prior to the first epilogue insn. */ |
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426 | #define NOTE_INSN_EPILOGUE_BEG -11 |
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427 | /* Generated in place of user-declared labels when they are deleted. */ |
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428 | #define NOTE_INSN_DELETED_LABEL -12 |
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429 | /* This note indicates the start of the real body of the function, |
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430 | i.e. the point just after all of the parms have been moved into |
---|
431 | their homes, etc. */ |
---|
432 | #define NOTE_INSN_FUNCTION_BEG -13 |
---|
433 | |
---|
434 | |
---|
435 | #if 0 /* These are not used, and I don't know what they were for. --rms. */ |
---|
436 | #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr) |
---|
437 | #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint) |
---|
438 | #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx) |
---|
439 | #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint) |
---|
440 | #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint) |
---|
441 | #endif /* 0 */ |
---|
442 | |
---|
443 | /* Names for NOTE insn's other than line numbers. */ |
---|
444 | |
---|
445 | extern char *note_insn_name[]; |
---|
446 | #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)]) |
---|
447 | |
---|
448 | /* The name of a label, in case it corresponds to an explicit label |
---|
449 | in the input source code. */ |
---|
450 | #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr) |
---|
451 | |
---|
452 | /* In jump.c, each label contains a count of the number |
---|
453 | of LABEL_REFs that point at it, so unused labels can be deleted. */ |
---|
454 | #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint) |
---|
455 | |
---|
456 | /* The rest is used instead of the above, in a CODE_LABEL, |
---|
457 | if bytecode is being output. |
---|
458 | We make the slightly kludgy assumption that a LABEL has enough slots |
---|
459 | to hold these things. That happens to be true. */ |
---|
460 | |
---|
461 | /* For static or external objects. */ |
---|
462 | #define BYTECODE_LABEL(X) (XEXP ((X), 0)) |
---|
463 | |
---|
464 | /* For goto labels inside bytecode functions. */ |
---|
465 | #define BYTECODE_BC_LABEL(X) (*(struct bc_label **) &XEXP ((X), 1)) |
---|
466 | |
---|
467 | /* In jump.c, each JUMP_INSN can point to a label that it can jump to, |
---|
468 | so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can |
---|
469 | be decremented and possibly the label can be deleted. */ |
---|
470 | #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx) |
---|
471 | |
---|
472 | /* Once basic blocks are found in flow.c, |
---|
473 | each CODE_LABEL starts a chain that goes through |
---|
474 | all the LABEL_REFs that jump to that label. |
---|
475 | The chain eventually winds up at the CODE_LABEL; it is circular. */ |
---|
476 | #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx) |
---|
477 | |
---|
478 | /* This is the field in the LABEL_REF through which the circular chain |
---|
479 | of references to a particular label is linked. |
---|
480 | This chain is set up in flow.c. */ |
---|
481 | |
---|
482 | #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx) |
---|
483 | |
---|
484 | /* Once basic blocks are found in flow.c, |
---|
485 | Each LABEL_REF points to its containing instruction with this field. */ |
---|
486 | |
---|
487 | #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx) |
---|
488 | |
---|
489 | /* For a REG rtx, REGNO extracts the register number. */ |
---|
490 | |
---|
491 | #define REGNO(RTX) ((RTX)->fld[0].rtint) |
---|
492 | |
---|
493 | /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg |
---|
494 | is the current function's return value. */ |
---|
495 | |
---|
496 | #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated) |
---|
497 | |
---|
498 | /* 1 in a REG rtx if it corresponds to a variable declared by the user. */ |
---|
499 | #define REG_USERVAR_P(RTX) ((RTX)->volatil) |
---|
500 | |
---|
501 | /* For a CONST_INT rtx, INTVAL extracts the integer. */ |
---|
502 | |
---|
503 | #define INTVAL(RTX) ((RTX)->fld[0].rtwint) |
---|
504 | |
---|
505 | /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of. |
---|
506 | SUBREG_WORD extracts the word-number. */ |
---|
507 | |
---|
508 | #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx) |
---|
509 | #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint) |
---|
510 | |
---|
511 | /* 1 if the REG contained in SUBREG_REG is already known to be |
---|
512 | sign- or zero-extended from the mode of the SUBREG to the mode of |
---|
513 | the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the |
---|
514 | extension. |
---|
515 | |
---|
516 | When used as a LHS, is means that this extension must be done |
---|
517 | when assigning to SUBREG_REG. */ |
---|
518 | |
---|
519 | #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct) |
---|
520 | #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging) |
---|
521 | |
---|
522 | /* Access various components of an ASM_OPERANDS rtx. */ |
---|
523 | |
---|
524 | #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0) |
---|
525 | #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1) |
---|
526 | #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2) |
---|
527 | #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3) |
---|
528 | #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4) |
---|
529 | #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N)) |
---|
530 | #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3) |
---|
531 | #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0) |
---|
532 | #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N))) |
---|
533 | #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5) |
---|
534 | #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6) |
---|
535 | |
---|
536 | /* For a MEM rtx, 1 if it's a volatile reference. |
---|
537 | Also in an ASM_OPERANDS rtx. */ |
---|
538 | #define MEM_VOLATILE_P(RTX) ((RTX)->volatil) |
---|
539 | |
---|
540 | /* For a MEM rtx, 1 if it refers to a structure or union component. */ |
---|
541 | #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct) |
---|
542 | |
---|
543 | /* For a LABEL_REF, 1 means that this reference is to a label outside the |
---|
544 | loop containing the reference. */ |
---|
545 | #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct) |
---|
546 | |
---|
547 | /* For a LABEL_REF, 1 means it is for a nonlocal label. */ |
---|
548 | /* Likewise in an EXPR_LIST for a REG_LABEL note. */ |
---|
549 | #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil) |
---|
550 | |
---|
551 | /* For a CODE_LABEL, 1 means always consider this label to be needed. */ |
---|
552 | #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct) |
---|
553 | |
---|
554 | /* For a REG, 1 means the register is used only in an exit test of a loop. */ |
---|
555 | #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct) |
---|
556 | |
---|
557 | /* During sched, for an insn, 1 means that the insn must be scheduled together |
---|
558 | with the preceding insn. */ |
---|
559 | #define SCHED_GROUP_P(INSN) ((INSN)->in_struct) |
---|
560 | |
---|
561 | /* During sched, for the LOG_LINKS of an insn, these cache the adjusted |
---|
562 | cost of the dependence link. The cost of executing an instruction |
---|
563 | may vary based on how the results are used. LINK_COST_ZERO is 1 when |
---|
564 | the cost through the link varies and is unchanged (i.e., the link has |
---|
565 | zero additional cost). LINK_COST_FREE is 1 when the cost through the |
---|
566 | link is zero (i.e., the link makes the cost free). In other cases, |
---|
567 | the adjustment to the cost is recomputed each time it is needed. */ |
---|
568 | #define LINK_COST_ZERO(X) ((X)->jump) |
---|
569 | #define LINK_COST_FREE(X) ((X)->call) |
---|
570 | |
---|
571 | /* For a SET rtx, SET_DEST is the place that is set |
---|
572 | and SET_SRC is the value it is set to. */ |
---|
573 | #define SET_DEST(RTX) ((RTX)->fld[0].rtx) |
---|
574 | #define SET_SRC(RTX) ((RTX)->fld[1].rtx) |
---|
575 | |
---|
576 | /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */ |
---|
577 | #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx) |
---|
578 | |
---|
579 | /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */ |
---|
580 | #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging) |
---|
581 | |
---|
582 | /* Flag in a SYMBOL_REF for machine-specific purposes. */ |
---|
583 | #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil) |
---|
584 | |
---|
585 | /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */ |
---|
586 | #define SYMBOL_REF_USED(RTX) ((RTX)->used) |
---|
587 | |
---|
588 | /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn |
---|
589 | of the function that is not involved in copying parameters to |
---|
590 | pseudo-registers. FIRST_PARM_INSN is the very first insn of |
---|
591 | the function, including the parameter copying. |
---|
592 | We keep this around in case we must splice |
---|
593 | this function into the assembly code at the end of the file. |
---|
594 | FIRST_LABELNO is the first label number used by the function (inclusive). |
---|
595 | LAST_LABELNO is the last label used by the function (exclusive). |
---|
596 | MAX_REGNUM is the largest pseudo-register used by that function. |
---|
597 | FUNCTION_ARGS_SIZE is the size of the argument block in the stack. |
---|
598 | POPS_ARGS is the number of bytes of input arguments popped by the function |
---|
599 | STACK_SLOT_LIST is the list of stack slots. |
---|
600 | FORCED_LABELS is the list of labels whose address was taken. |
---|
601 | FUNCTION_FLAGS are where single-bit flags are saved. |
---|
602 | OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list. |
---|
603 | ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values |
---|
604 | for the function arguments. |
---|
605 | ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the |
---|
606 | function. |
---|
607 | |
---|
608 | We want this to lay down like an INSN. The PREV_INSN field |
---|
609 | is always NULL. The NEXT_INSN field always points to the |
---|
610 | first function insn of the function being squirreled away. */ |
---|
611 | |
---|
612 | #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx) |
---|
613 | #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx) |
---|
614 | #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint) |
---|
615 | #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint) |
---|
616 | #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint) |
---|
617 | #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint) |
---|
618 | #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint) |
---|
619 | #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint) |
---|
620 | #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx) |
---|
621 | #define FORCED_LABELS(RTX) ((RTX)->fld[11].rtx) |
---|
622 | #define FUNCTION_FLAGS(RTX) ((RTX)->fld[12].rtint) |
---|
623 | #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[13].rtint) |
---|
624 | #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[14].rtvec) |
---|
625 | #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[15].rtx) |
---|
626 | |
---|
627 | /* In FUNCTION_FLAGS we save some variables computed when emitting the code |
---|
628 | for the function and which must be `or'ed into the current flag values when |
---|
629 | insns from that function are being inlined. */ |
---|
630 | |
---|
631 | /* These ought to be an enum, but non-ANSI compilers don't like that. */ |
---|
632 | #define FUNCTION_FLAGS_CALLS_ALLOCA 01 |
---|
633 | #define FUNCTION_FLAGS_CALLS_SETJMP 02 |
---|
634 | #define FUNCTION_FLAGS_RETURNS_STRUCT 04 |
---|
635 | #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010 |
---|
636 | #define FUNCTION_FLAGS_NEEDS_CONTEXT 020 |
---|
637 | #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040 |
---|
638 | #define FUNCTION_FLAGS_RETURNS_POINTER 0100 |
---|
639 | #define FUNCTION_FLAGS_USES_CONST_POOL 0200 |
---|
640 | #define FUNCTION_FLAGS_CALLS_LONGJMP 0400 |
---|
641 | #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000 |
---|
642 | |
---|
643 | /* Define a macro to look for REG_INC notes, |
---|
644 | but save time on machines where they never exist. */ |
---|
645 | |
---|
646 | /* Don't continue this line--convex cc version 4.1 would lose. */ |
---|
647 | #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT)) |
---|
648 | #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg))) |
---|
649 | #else |
---|
650 | #define FIND_REG_INC_NOTE(insn, reg) 0 |
---|
651 | #endif |
---|
652 | |
---|
653 | /* Indicate whether the machine has any sort of auto increment addressing. |
---|
654 | If not, we can avoid checking for REG_INC notes. */ |
---|
655 | |
---|
656 | /* Don't continue this line--convex cc version 4.1 would lose. */ |
---|
657 | #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT)) |
---|
658 | #define AUTO_INC_DEC |
---|
659 | #endif |
---|
660 | |
---|
661 | /* Generally useful functions. */ |
---|
662 | |
---|
663 | /* The following functions accept a wide integer argument. Rather than |
---|
664 | having to cast on every function call, we use a macro instead, that is |
---|
665 | defined here and in tree.h. */ |
---|
666 | |
---|
667 | #ifndef exact_log2 |
---|
668 | #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N)) |
---|
669 | #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N)) |
---|
670 | #endif |
---|
671 | |
---|
672 | #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C)) |
---|
673 | |
---|
674 | #define plus_constant_for_output(X,C) \ |
---|
675 | plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C)) |
---|
676 | |
---|
677 | extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT)); |
---|
678 | extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT)); |
---|
679 | |
---|
680 | #define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (HOST_WIDE_INT) (N)) |
---|
681 | |
---|
682 | extern rtx bc_gen_rtx (); |
---|
683 | |
---|
684 | extern rtx gen_rtx PVPROTO((enum rtx_code, |
---|
685 | enum machine_mode, ...)); |
---|
686 | extern rtvec gen_rtvec PVPROTO((int, ...)); |
---|
687 | |
---|
688 | extern rtx read_rtx STDIO_PROTO((FILE *)); |
---|
689 | |
---|
690 | #if 0 |
---|
691 | /* At present, don't prototype xrealloc, since all of the callers don't |
---|
692 | cast their pointers to char *, and all of the xrealloc's don't use |
---|
693 | void * yet. */ |
---|
694 | extern char *xmalloc PROTO((size_t)); |
---|
695 | extern char *xrealloc PROTO((void *, size_t)); |
---|
696 | #else |
---|
697 | extern char *xmalloc (); |
---|
698 | extern char *xrealloc (); |
---|
699 | #endif |
---|
700 | |
---|
701 | extern char *oballoc PROTO((int)); |
---|
702 | extern char *permalloc PROTO((int)); |
---|
703 | extern void free PROTO((void *)); |
---|
704 | extern rtx rtx_alloc PROTO((RTX_CODE)); |
---|
705 | extern rtvec rtvec_alloc PROTO((int)); |
---|
706 | extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx)); |
---|
707 | extern rtx find_regno_note PROTO((rtx, enum reg_note, int)); |
---|
708 | extern int find_reg_fusage PROTO((rtx, enum rtx_code, rtx)); |
---|
709 | extern int find_regno_fusage PROTO((rtx, enum rtx_code, int)); |
---|
710 | extern HOST_WIDE_INT get_integer_term PROTO((rtx)); |
---|
711 | extern rtx get_related_value PROTO((rtx)); |
---|
712 | extern rtx single_set PROTO((rtx)); |
---|
713 | extern rtx find_last_value PROTO((rtx, rtx *, rtx)); |
---|
714 | extern rtx copy_rtx PROTO((rtx)); |
---|
715 | extern rtx copy_rtx_if_shared PROTO((rtx)); |
---|
716 | extern rtx copy_most_rtx PROTO((rtx, rtx)); |
---|
717 | extern rtx replace_rtx PROTO((rtx, rtx, rtx)); |
---|
718 | extern rtvec gen_rtvec_v PROTO((int, rtx *)); |
---|
719 | extern rtx gen_reg_rtx PROTO((enum machine_mode)); |
---|
720 | extern rtx gen_label_rtx PROTO((void)); |
---|
721 | extern rtx gen_inline_header_rtx PROTO((rtx, rtx, int, int, int, int, |
---|
722 | int, int, rtx, rtx, int, int, |
---|
723 | rtvec, rtx)); |
---|
724 | extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx)); |
---|
725 | extern rtx gen_lowpart PROTO((enum machine_mode, rtx)); |
---|
726 | extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx)); |
---|
727 | extern rtx gen_highpart PROTO((enum machine_mode, rtx)); |
---|
728 | extern rtx gen_realpart PROTO((enum machine_mode, rtx)); |
---|
729 | extern rtx gen_imagpart PROTO((enum machine_mode, rtx)); |
---|
730 | extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode)); |
---|
731 | extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode)); |
---|
732 | extern int subreg_lowpart_p PROTO((rtx)); |
---|
733 | extern rtx make_safe_from PROTO((rtx, rtx)); |
---|
734 | extern rtx convert_memory_address PROTO((enum machine_mode, rtx)); |
---|
735 | extern rtx memory_address PROTO((enum machine_mode, rtx)); |
---|
736 | extern rtx get_insns PROTO((void)); |
---|
737 | extern rtx get_last_insn PROTO((void)); |
---|
738 | extern rtx get_last_insn_anywhere PROTO((void)); |
---|
739 | extern void start_sequence PROTO((void)); |
---|
740 | extern void push_to_sequence PROTO((rtx)); |
---|
741 | extern void end_sequence PROTO((void)); |
---|
742 | extern rtx gen_sequence PROTO((void)); |
---|
743 | extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode)); |
---|
744 | extern rtx force_const_mem PROTO((enum machine_mode, rtx)); |
---|
745 | extern rtx force_reg PROTO((enum machine_mode, rtx)); |
---|
746 | extern rtx get_pool_constant PROTO((rtx)); |
---|
747 | extern enum machine_mode get_pool_mode PROTO((rtx)); |
---|
748 | extern int get_pool_offset PROTO((rtx)); |
---|
749 | extern rtx simplify_subtraction PROTO((rtx)); |
---|
750 | extern rtx assign_stack_local PROTO((enum machine_mode, int, int)); |
---|
751 | extern rtx assign_stack_temp PROTO((enum machine_mode, int, int)); |
---|
752 | extern rtx protect_from_queue PROTO((rtx, int)); |
---|
753 | extern void emit_queue PROTO((void)); |
---|
754 | extern rtx emit_move_insn PROTO((rtx, rtx)); |
---|
755 | extern rtx emit_insn_before PROTO((rtx, rtx)); |
---|
756 | extern rtx emit_jump_insn_before PROTO((rtx, rtx)); |
---|
757 | extern rtx emit_call_insn_before PROTO((rtx, rtx)); |
---|
758 | extern rtx emit_barrier_before PROTO((rtx)); |
---|
759 | extern rtx emit_note_before PROTO((int, rtx)); |
---|
760 | extern rtx emit_insn_after PROTO((rtx, rtx)); |
---|
761 | extern rtx emit_jump_insn_after PROTO((rtx, rtx)); |
---|
762 | extern rtx emit_barrier_after PROTO((rtx)); |
---|
763 | extern rtx emit_label_after PROTO((rtx, rtx)); |
---|
764 | extern rtx emit_note_after PROTO((int, rtx)); |
---|
765 | extern rtx emit_line_note_after PROTO((char *, int, rtx)); |
---|
766 | extern rtx emit_insn PROTO((rtx)); |
---|
767 | extern rtx emit_insns PROTO((rtx)); |
---|
768 | extern rtx emit_insns_before PROTO((rtx, rtx)); |
---|
769 | extern rtx emit_insns_after PROTO((rtx, rtx)); |
---|
770 | extern rtx emit_jump_insn PROTO((rtx)); |
---|
771 | extern rtx emit_call_insn PROTO((rtx)); |
---|
772 | extern rtx emit_label PROTO((rtx)); |
---|
773 | extern rtx emit_barrier PROTO((void)); |
---|
774 | extern rtx emit_line_note PROTO((char *, int)); |
---|
775 | extern rtx emit_note PROTO((char *, int)); |
---|
776 | extern rtx emit_line_note_force PROTO((char *, int)); |
---|
777 | extern rtx make_insn_raw PROTO((rtx)); |
---|
778 | extern rtx previous_insn PROTO((rtx)); |
---|
779 | extern rtx next_insn PROTO((rtx)); |
---|
780 | extern rtx prev_nonnote_insn PROTO((rtx)); |
---|
781 | extern rtx next_nonnote_insn PROTO((rtx)); |
---|
782 | extern rtx prev_real_insn PROTO((rtx)); |
---|
783 | extern rtx next_real_insn PROTO((rtx)); |
---|
784 | extern rtx prev_active_insn PROTO((rtx)); |
---|
785 | extern rtx next_active_insn PROTO((rtx)); |
---|
786 | extern rtx prev_label PROTO((rtx)); |
---|
787 | extern rtx next_label PROTO((rtx)); |
---|
788 | extern rtx next_cc0_user PROTO((rtx)); |
---|
789 | extern rtx prev_cc0_setter PROTO((rtx)); |
---|
790 | extern rtx reg_set_last PROTO((rtx, rtx)); |
---|
791 | extern rtx next_nondeleted_insn PROTO((rtx)); |
---|
792 | extern enum rtx_code reverse_condition PROTO((enum rtx_code)); |
---|
793 | extern enum rtx_code swap_condition PROTO((enum rtx_code)); |
---|
794 | extern enum rtx_code unsigned_condition PROTO((enum rtx_code)); |
---|
795 | extern enum rtx_code signed_condition PROTO((enum rtx_code)); |
---|
796 | extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode)); |
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797 | extern rtx squeeze_notes PROTO((rtx, rtx)); |
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798 | extern rtx delete_insn PROTO((rtx)); |
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799 | extern void delete_jump PROTO((rtx)); |
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800 | extern rtx get_label_before PROTO((rtx)); |
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801 | extern rtx get_label_after PROTO((rtx)); |
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802 | extern rtx follow_jumps PROTO((rtx)); |
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803 | extern rtx adj_offsettable_operand PROTO((rtx, int)); |
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804 | extern rtx try_split PROTO((rtx, rtx, int)); |
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805 | extern rtx split_insns PROTO((rtx, rtx)); |
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806 | extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode)); |
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807 | extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx)); |
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808 | extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx)); |
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809 | extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx)); |
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810 | extern rtx nonlocal_label_rtx_list PROTO((void)); |
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811 | extern rtx gen_move_insn PROTO((rtx, rtx)); |
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812 | extern rtx gen_jump PROTO((rtx)); |
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813 | extern rtx gen_beq PROTO((rtx)); |
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814 | extern rtx gen_bge PROTO((rtx)); |
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815 | extern rtx gen_ble PROTO((rtx)); |
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816 | extern rtx eliminate_constant_term PROTO((rtx, rtx *)); |
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817 | extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int)); |
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818 | extern enum machine_mode choose_hard_reg_mode PROTO((int, int)); |
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819 | |
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820 | /* Maximum number of parallel sets and clobbers in any insn in this fn. |
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821 | Always at least 3, since the combiner could put that many togetherm |
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822 | and we want this to remain correct for all the remaining passes. */ |
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823 | |
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824 | extern int max_parallel; |
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825 | |
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826 | extern int asm_noperands PROTO((rtx)); |
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827 | extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **, char **, enum machine_mode *)); |
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828 | |
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829 | extern enum reg_class reg_preferred_class PROTO((int)); |
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830 | extern enum reg_class reg_alternate_class PROTO((int)); |
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831 | |
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832 | extern rtx get_first_nonparm_insn PROTO((void)); |
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833 | |
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834 | /* Standard pieces of rtx, to be substituted directly into things. */ |
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835 | extern rtx pc_rtx; |
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836 | extern rtx cc0_rtx; |
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837 | extern rtx const0_rtx; |
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838 | extern rtx const1_rtx; |
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839 | extern rtx const2_rtx; |
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840 | extern rtx constm1_rtx; |
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841 | extern rtx const_true_rtx; |
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842 | |
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843 | extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE]; |
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844 | |
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845 | /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the |
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846 | same as VOIDmode. */ |
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847 | |
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848 | #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)]) |
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849 | |
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850 | /* Likewise, for the constants 1 and 2. */ |
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851 | |
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852 | #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)]) |
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853 | #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)]) |
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854 | |
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855 | /* All references to certain hard regs, except those created |
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856 | by allocating pseudo regs into them (when that's possible), |
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857 | go through these unique rtx objects. */ |
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858 | extern rtx stack_pointer_rtx; |
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859 | extern rtx frame_pointer_rtx; |
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860 | extern rtx hard_frame_pointer_rtx; |
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861 | extern rtx arg_pointer_rtx; |
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862 | extern rtx pic_offset_table_rtx; |
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863 | extern rtx struct_value_rtx; |
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864 | extern rtx struct_value_incoming_rtx; |
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865 | extern rtx static_chain_rtx; |
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866 | extern rtx static_chain_incoming_rtx; |
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867 | |
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868 | /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg |
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869 | is used to represent the frame pointer. This is because the |
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870 | hard frame pointer and the automatic variables are separated by an amount |
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871 | that cannot be determined until after register allocation. We can assume |
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872 | that in this case ELIMINABLE_REGS will be defined, one action of which |
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873 | will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */ |
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874 | #ifndef HARD_FRAME_POINTER_REGNUM |
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875 | #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM |
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876 | #endif |
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877 | |
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878 | /* Virtual registers are used during RTL generation to refer to locations into |
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879 | the stack frame when the actual location isn't known until RTL generation |
---|
880 | is complete. The routine instantiate_virtual_regs replaces these with |
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881 | the proper value, which is normally {frame,arg,stack}_pointer_rtx plus |
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882 | a constant. */ |
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883 | |
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884 | #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER) |
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885 | |
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886 | /* This points to the first word of the incoming arguments passed on the stack, |
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887 | either by the caller or by the callee when pretending it was passed by the |
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888 | caller. */ |
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889 | |
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890 | extern rtx virtual_incoming_args_rtx; |
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891 | |
---|
892 | #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER) |
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893 | |
---|
894 | /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first |
---|
895 | variable on the stack. Otherwise, it points to the first variable on |
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896 | the stack. */ |
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897 | |
---|
898 | extern rtx virtual_stack_vars_rtx; |
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899 | |
---|
900 | #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1) |
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901 | |
---|
902 | /* This points to the location of dynamically-allocated memory on the stack |
---|
903 | immediately after the stack pointer has been adjusted by the amount |
---|
904 | desired. */ |
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905 | |
---|
906 | extern rtx virtual_stack_dynamic_rtx; |
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907 | |
---|
908 | #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2) |
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909 | |
---|
910 | /* This points to the location in the stack at which outgoing arguments should |
---|
911 | be written when the stack is pre-pushed (arguments pushed using push |
---|
912 | insns always use sp). */ |
---|
913 | |
---|
914 | extern rtx virtual_outgoing_args_rtx; |
---|
915 | |
---|
916 | #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3) |
---|
917 | |
---|
918 | #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3) |
---|
919 | |
---|
920 | extern rtx find_next_ref PROTO((rtx, rtx)); |
---|
921 | extern rtx *find_single_use PROTO((rtx, rtx, rtx *)); |
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922 | |
---|
923 | /* It is hard to write the prototype for expand_expr, since it needs |
---|
924 | expr.h to be included for the enumeration. */ |
---|
925 | |
---|
926 | extern rtx expand_expr (); |
---|
927 | |
---|
928 | extern rtx output_constant_def PROTO((union tree_node *)); |
---|
929 | extern rtx immed_real_const PROTO((union tree_node *)); |
---|
930 | extern union tree_node *make_tree PROTO((union tree_node *, rtx)); |
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931 | |
---|
932 | /* Abort routines */ |
---|
933 | extern void fatal_insn_not_found PROTO((rtx)); |
---|
934 | extern void fatal_insn PROTO((char *, rtx)); |
---|
935 | |
---|
936 | /* Define a default value for STORE_FLAG_VALUE. */ |
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937 | |
---|
938 | #ifndef STORE_FLAG_VALUE |
---|
939 | #define STORE_FLAG_VALUE 1 |
---|
940 | #endif |
---|
941 | |
---|
942 | /* Nonzero after end of reload pass. |
---|
943 | Set to 1 or 0 by toplev.c. */ |
---|
944 | |
---|
945 | extern int reload_completed; |
---|
946 | |
---|
947 | /* Set to 1 while reload_as_needed is operating. |
---|
948 | Required by some machines to handle any generated moves differently. */ |
---|
949 | |
---|
950 | extern int reload_in_progress; |
---|
951 | |
---|
952 | /* If this is nonzero, we do not bother generating VOLATILE |
---|
953 | around volatile memory references, and we are willing to |
---|
954 | output indirect addresses. If cse is to follow, we reject |
---|
955 | indirect addresses so a useful potential cse is generated; |
---|
956 | if it is used only once, instruction combination will produce |
---|
957 | the same indirect address eventually. */ |
---|
958 | extern int cse_not_expected; |
---|
959 | |
---|
960 | /* Indexed by pseudo register number, gives the rtx for that pseudo. |
---|
961 | Allocated in parallel with regno_pointer_flag. */ |
---|
962 | extern rtx *regno_reg_rtx; |
---|
963 | |
---|
964 | /* Translates rtx code to tree code, for those codes needed by |
---|
965 | REAL_ARITHMETIC. The function returns an int because the caller may not |
---|
966 | know what `enum tree_code' means. */ |
---|
967 | |
---|
968 | extern int rtx_to_tree_code PROTO((enum rtx_code)); |
---|