1 | /* Communication between reload.c and reload1.c. |
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2 | Copyright (C) 1987, 1991, 1992, 1993, 1994 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 | /* If secondary reloads are the same for inputs and outputs, define those |
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23 | macros here. */ |
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24 | |
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25 | #ifdef SECONDARY_RELOAD_CLASS |
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26 | #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \ |
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27 | SECONDARY_RELOAD_CLASS (CLASS, MODE, X) |
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28 | #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \ |
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29 | SECONDARY_RELOAD_CLASS (CLASS, MODE, X) |
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30 | #endif |
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31 | |
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32 | /* If either macro is defined, show that we need secondary reloads. */ |
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33 | #if defined(SECONDARY_INPUT_RELOAD_CLASS) || defined(SECONDARY_OUTPUT_RELOAD_CLASS) |
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34 | #define HAVE_SECONDARY_RELOADS |
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35 | #endif |
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36 | |
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37 | /* See reload.c and reload1.c for comments on these variables. */ |
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38 | |
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39 | /* Maximum number of reloads we can need. */ |
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40 | #define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1)) |
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41 | |
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42 | extern rtx reload_in[MAX_RELOADS]; |
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43 | extern rtx reload_out[MAX_RELOADS]; |
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44 | extern rtx reload_in_reg[MAX_RELOADS]; |
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45 | extern enum reg_class reload_reg_class[MAX_RELOADS]; |
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46 | extern enum machine_mode reload_inmode[MAX_RELOADS]; |
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47 | extern enum machine_mode reload_outmode[MAX_RELOADS]; |
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48 | extern char reload_optional[MAX_RELOADS]; |
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49 | extern int reload_inc[MAX_RELOADS]; |
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50 | extern int reload_opnum[MAX_RELOADS]; |
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51 | extern int reload_secondary_p[MAX_RELOADS]; |
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52 | extern int reload_secondary_in_reload[MAX_RELOADS]; |
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53 | extern int reload_secondary_out_reload[MAX_RELOADS]; |
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54 | #ifdef MAX_INSN_CODE |
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55 | extern enum insn_code reload_secondary_in_icode[MAX_RELOADS]; |
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56 | extern enum insn_code reload_secondary_out_icode[MAX_RELOADS]; |
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57 | #endif |
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58 | extern int n_reloads; |
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59 | |
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60 | extern rtx reload_reg_rtx[MAX_RELOADS]; |
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61 | |
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62 | /* Encode the usage of a reload. The following codes are supported: |
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63 | |
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64 | RELOAD_FOR_INPUT reload of an input operand |
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65 | RELOAD_FOR_OUTPUT likewise, for output |
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66 | RELOAD_FOR_INSN a reload that must not conflict with anything |
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67 | used in the insn, but may conflict with |
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68 | something used before or after the insn |
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69 | RELOAD_FOR_INPUT_ADDRESS reload for parts of the address of an object |
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70 | that is an input reload |
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71 | RELOAD_FOR_OUTPUT_ADDRESS likewise, for output reload |
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72 | RELOAD_FOR_OPERAND_ADDRESS reload for the address of a non-reloaded |
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73 | operand; these don't conflict with |
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74 | any other addresses. |
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75 | RELOAD_FOR_OPADDR_ADDR reload needed for RELOAD_FOR_OPERAND_ADDRESS |
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76 | reloads; usually secondary reloads |
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77 | RELOAD_OTHER none of the above, usually multiple uses |
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78 | RELOAD_FOR_OTHER_ADDRESS reload for part of the address of an input |
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79 | that is marked RELOAD_OTHER. |
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80 | |
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81 | This used to be "enum reload_when_needed" but some debuggers have trouble |
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82 | with an enum tag and variable of the same name. */ |
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83 | |
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84 | enum reload_type |
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85 | { |
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86 | RELOAD_FOR_INPUT, RELOAD_FOR_OUTPUT, RELOAD_FOR_INSN, |
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87 | RELOAD_FOR_INPUT_ADDRESS, RELOAD_FOR_OUTPUT_ADDRESS, |
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88 | RELOAD_FOR_OPERAND_ADDRESS, RELOAD_FOR_OPADDR_ADDR, |
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89 | RELOAD_OTHER, RELOAD_FOR_OTHER_ADDRESS |
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90 | }; |
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91 | |
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92 | extern enum reload_type reload_when_needed[MAX_RELOADS]; |
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93 | |
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94 | extern rtx *reg_equiv_constant; |
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95 | extern rtx *reg_equiv_memory_loc; |
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96 | extern rtx *reg_equiv_address; |
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97 | extern rtx *reg_equiv_mem; |
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98 | |
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99 | /* All the "earlyclobber" operands of the current insn |
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100 | are recorded here. */ |
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101 | extern int n_earlyclobbers; |
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102 | extern rtx reload_earlyclobbers[MAX_RECOG_OPERANDS]; |
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103 | |
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104 | /* Save the number of operands. */ |
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105 | extern int reload_n_operands; |
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106 | |
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107 | /* First uid used by insns created by reload in this function. |
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108 | Used in find_equiv_reg. */ |
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109 | extern int reload_first_uid; |
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110 | |
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111 | /* Nonzero if indirect addressing is supported when the innermost MEM is |
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112 | of the form (MEM (SYMBOL_REF sym)). It is assumed that the level to |
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113 | which these are valid is the same as spill_indirect_levels, above. */ |
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114 | |
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115 | extern char indirect_symref_ok; |
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116 | |
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117 | /* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid. */ |
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118 | extern char double_reg_address_ok; |
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119 | |
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120 | #ifdef MAX_INSN_CODE |
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121 | /* These arrays record the insn_code of insns that may be needed to |
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122 | perform input and output reloads of special objects. They provide a |
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123 | place to pass a scratch register. */ |
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124 | extern enum insn_code reload_in_optab[]; |
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125 | extern enum insn_code reload_out_optab[]; |
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126 | #endif |
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127 | |
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128 | /* Functions from reload.c: */ |
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129 | |
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130 | /* Return a memory location that will be used to copy X in mode MODE. |
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131 | If we haven't already made a location for this mode in this insn, |
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132 | call find_reloads_address on the location being returned. */ |
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133 | extern rtx get_secondary_mem PROTO((rtx, enum machine_mode, |
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134 | int, enum reload_type)); |
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135 | |
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136 | /* Clear any secondary memory locations we've made. */ |
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137 | extern void clear_secondary_mem PROTO((void)); |
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138 | |
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139 | /* Transfer all replacements that used to be in reload FROM to be in |
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140 | reload TO. */ |
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141 | extern void transfer_replacements PROTO((int, int)); |
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142 | |
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143 | /* Return 1 if ADDR is a valid memory address for mode MODE, |
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144 | and check that each pseudo reg has the proper kind of |
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145 | hard reg. */ |
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146 | extern int strict_memory_address_p PROTO((enum machine_mode, rtx)); |
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147 | |
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148 | /* Like rtx_equal_p except that it allows a REG and a SUBREG to match |
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149 | if they are the same hard reg, and has special hacks for |
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150 | autoincrement and autodecrement. */ |
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151 | extern int operands_match_p PROTO((rtx, rtx)); |
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152 | |
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153 | /* Return the number of times character C occurs in string S. */ |
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154 | extern int n_occurrences PROTO((int, char *)); |
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155 | |
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156 | /* Return 1 if altering OP will not modify the value of CLOBBER. */ |
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157 | extern int safe_from_earlyclobber PROTO((rtx, rtx)); |
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158 | |
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159 | /* Search the body of INSN for values that need reloading and record them |
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160 | with push_reload. REPLACE nonzero means record also where the values occur |
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161 | so that subst_reloads can be used. */ |
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162 | extern void find_reloads PROTO((rtx, int, int, int, short *)); |
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163 | |
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164 | /* Compute the sum of X and Y, making canonicalizations assumed in an |
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165 | address, namely: sum constant integers, surround the sum of two |
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166 | constants with a CONST, put the constant as the second operand, and |
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167 | group the constant on the outermost sum. */ |
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168 | extern rtx form_sum PROTO((rtx, rtx)); |
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169 | |
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170 | /* Substitute into the current INSN the registers into which we have reloaded |
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171 | the things that need reloading. */ |
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172 | extern void subst_reloads PROTO((void)); |
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173 | |
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174 | /* Make a copy of any replacements being done into X and move those copies |
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175 | to locations in Y, a copy of X. We only look at the highest level of |
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176 | the RTL. */ |
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177 | extern void copy_replacements PROTO((rtx, rtx)); |
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178 | |
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179 | /* If LOC was scheduled to be replaced by something, return the replacement. |
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180 | Otherwise, return *LOC. */ |
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181 | extern rtx find_replacement PROTO((rtx *)); |
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182 | |
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183 | /* Return nonzero if register in range [REGNO, ENDREGNO) |
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184 | appears either explicitly or implicitly in X |
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185 | other than being stored into. */ |
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186 | extern int refers_to_regno_for_reload_p PROTO((int, int, rtx, rtx *)); |
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187 | |
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188 | /* Nonzero if modifying X will affect IN. */ |
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189 | extern int reg_overlap_mentioned_for_reload_p PROTO((rtx, rtx)); |
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190 | |
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191 | /* Return nonzero if anything in X contains a MEM. Look also for pseudo |
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192 | registers. */ |
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193 | extern int refers_to_mem_for_reload_p PROTO((rtx)); |
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194 | |
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195 | /* Check the insns before INSN to see if there is a suitable register |
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196 | containing the same value as GOAL. */ |
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197 | extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, |
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198 | int, enum machine_mode)); |
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199 | |
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200 | /* Return 1 if register REGNO is the subject of a clobber in insn INSN. */ |
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201 | extern int regno_clobbered_p PROTO((int, rtx)); |
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202 | |
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203 | |
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204 | /* Functions in reload1.c: */ |
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205 | |
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206 | /* Initialize the reload pass once per compilation. */ |
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207 | extern void init_reload PROTO((void)); |
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208 | |
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209 | /* The reload pass itself. */ |
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210 | extern int reload STDIO_PROTO((rtx, int, FILE *)); |
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211 | |
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212 | /* Mark the slots in regs_ever_live for the hard regs |
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213 | used by pseudo-reg number REGNO. */ |
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214 | extern void mark_home_live PROTO((int)); |
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215 | |
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216 | /* Scan X and replace any eliminable registers (such as fp) with a |
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217 | replacement (such as sp), plus an offset. */ |
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218 | extern rtx eliminate_regs PROTO((rtx, enum machine_mode, rtx)); |
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219 | |
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220 | /* Emit code to perform a reload from IN (which may be a reload register) to |
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221 | OUT (which may also be a reload register). IN or OUT is from operand |
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222 | OPNUM with reload type TYPE. */ |
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223 | extern rtx gen_reload PROTO((rtx, rtx, int, enum reload_type)); |
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224 | |
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225 | /* Functions in caller-save.c: */ |
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226 | |
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227 | /* Initialize for caller-save. */ |
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228 | extern void init_caller_save PROTO((void)); |
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229 | |
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230 | /* Initialize save areas by showing that we haven't allocated any yet. */ |
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231 | extern void init_save_areas PROTO((void)); |
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232 | |
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233 | /* Allocate save areas for any hard registers that might need saving. */ |
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234 | extern int setup_save_areas PROTO((int *)); |
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235 | |
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236 | /* Find the places where hard regs are live across calls and save them. */ |
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237 | extern void save_call_clobbered_regs PROTO((enum machine_mode)); |
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