1 | /* Sets (bit vectors) of hard registers, and operations on them. |
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2 | Copyright (C) 1987, 1992, 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 | /* Define the type of a set of hard registers. */ |
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23 | |
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24 | /* HARD_REG_ELT_TYPE is a typedef of the unsigned integral type which |
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25 | will be used for hard reg sets, either alone or in an array. |
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26 | |
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27 | If HARD_REG_SET is a macro, its definition is HARD_REG_ELT_TYPE, |
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28 | and it has enough bits to represent all the target machine's hard |
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29 | registers. Otherwise, it is a typedef for a suitably sized array |
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30 | of HARD_REG_ELT_TYPEs. HARD_REG_SET_LONGS is defined as how many. |
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31 | |
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32 | Note that lots of code assumes that the first part of a regset is |
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33 | the same format as a HARD_REG_SET. To help make sure this is true, |
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34 | we only try the widest integer mode (HOST_WIDE_INT) instead of all the |
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35 | smaller types. This approach loses only if there are a very few |
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36 | registers and then only in the few cases where we have an array of |
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37 | HARD_REG_SETs, so it needn't be as complex as it used to be. */ |
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38 | |
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39 | typedef unsigned HOST_WIDE_INT HARD_REG_ELT_TYPE; |
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40 | |
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41 | #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_WIDE_INT |
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42 | |
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43 | #define HARD_REG_SET HARD_REG_ELT_TYPE |
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44 | |
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45 | #else |
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46 | |
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47 | #define HARD_REG_SET_LONGS \ |
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48 | ((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_WIDE_INT - 1) \ |
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49 | / HOST_BITS_PER_WIDE_INT) |
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50 | typedef HARD_REG_ELT_TYPE HARD_REG_SET[HARD_REG_SET_LONGS]; |
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51 | |
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52 | #endif |
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53 | |
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54 | /* HARD_CONST is used to cast a constant to the appropriate type |
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55 | for use with a HARD_REG_SET. */ |
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56 | |
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57 | #define HARD_CONST(X) ((HARD_REG_ELT_TYPE) (X)) |
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58 | |
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59 | /* Define macros SET_HARD_REG_BIT, CLEAR_HARD_REG_BIT and TEST_HARD_REG_BIT |
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60 | to set, clear or test one bit in a hard reg set of type HARD_REG_SET. |
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61 | All three take two arguments: the set and the register number. |
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62 | |
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63 | In the case where sets are arrays of longs, the first argument |
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64 | is actually a pointer to a long. |
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65 | |
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66 | Define two macros for initializing a set: |
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67 | CLEAR_HARD_REG_SET and SET_HARD_REG_SET. |
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68 | These take just one argument. |
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69 | |
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70 | Also define macros for copying hard reg sets: |
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71 | COPY_HARD_REG_SET and COMPL_HARD_REG_SET. |
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72 | These take two arguments TO and FROM; they read from FROM |
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73 | and store into TO. COMPL_HARD_REG_SET complements each bit. |
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74 | |
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75 | Also define macros for combining hard reg sets: |
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76 | IOR_HARD_REG_SET and AND_HARD_REG_SET. |
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77 | These take two arguments TO and FROM; they read from FROM |
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78 | and combine bitwise into TO. Define also two variants |
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79 | IOR_COMPL_HARD_REG_SET and AND_COMPL_HARD_REG_SET |
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80 | which use the complement of the set FROM. |
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81 | |
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82 | Also define GO_IF_HARD_REG_SUBSET (X, Y, TO): |
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83 | if X is a subset of Y, go to TO. |
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84 | */ |
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85 | |
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86 | #ifdef HARD_REG_SET |
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87 | |
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88 | #define SET_HARD_REG_BIT(SET, BIT) \ |
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89 | ((SET) |= HARD_CONST (1) << (BIT)) |
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90 | #define CLEAR_HARD_REG_BIT(SET, BIT) \ |
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91 | ((SET) &= ~(HARD_CONST (1) << (BIT))) |
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92 | #define TEST_HARD_REG_BIT(SET, BIT) \ |
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93 | ((SET) & (HARD_CONST (1) << (BIT))) |
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94 | |
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95 | #define CLEAR_HARD_REG_SET(TO) ((TO) = HARD_CONST (0)) |
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96 | #define SET_HARD_REG_SET(TO) ((TO) = ~ HARD_CONST (0)) |
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97 | |
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98 | #define COPY_HARD_REG_SET(TO, FROM) ((TO) = (FROM)) |
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99 | #define COMPL_HARD_REG_SET(TO, FROM) ((TO) = ~(FROM)) |
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100 | |
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101 | #define IOR_HARD_REG_SET(TO, FROM) ((TO) |= (FROM)) |
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102 | #define IOR_COMPL_HARD_REG_SET(TO, FROM) ((TO) |= ~ (FROM)) |
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103 | #define AND_HARD_REG_SET(TO, FROM) ((TO) &= (FROM)) |
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104 | #define AND_COMPL_HARD_REG_SET(TO, FROM) ((TO) &= ~ (FROM)) |
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105 | |
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106 | #define GO_IF_HARD_REG_SUBSET(X,Y,TO) if (HARD_CONST (0) == ((X) & ~(Y))) goto TO |
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107 | |
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108 | #define GO_IF_HARD_REG_EQUAL(X,Y,TO) if ((X) == (Y)) goto TO |
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109 | |
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110 | #else |
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111 | |
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112 | #define UHOST_BITS_PER_WIDE_INT ((unsigned) HOST_BITS_PER_WIDE_INT) |
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113 | |
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114 | #define SET_HARD_REG_BIT(SET, BIT) \ |
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115 | ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ |
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116 | |= HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)) |
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117 | |
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118 | #define CLEAR_HARD_REG_BIT(SET, BIT) \ |
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119 | ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ |
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120 | &= ~(HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))) |
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121 | |
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122 | #define TEST_HARD_REG_BIT(SET, BIT) \ |
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123 | ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ |
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124 | & (HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))) |
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125 | |
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126 | #if FIRST_PSEUDO_REGISTER <= 2*HOST_BITS_PER_WIDE_INT |
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127 | #define CLEAR_HARD_REG_SET(TO) \ |
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128 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
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129 | scan_tp_[0] = 0; \ |
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130 | scan_tp_[1] = 0; } while (0) |
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131 | |
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132 | #define SET_HARD_REG_SET(TO) \ |
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133 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
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134 | scan_tp_[0] = -1; \ |
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135 | scan_tp_[1] = -1; } while (0) |
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136 | |
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137 | #define COPY_HARD_REG_SET(TO, FROM) \ |
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138 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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139 | scan_tp_[0] = scan_fp_[0]; \ |
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140 | scan_tp_[1] = scan_fp_[1]; } while (0) |
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141 | |
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142 | #define COMPL_HARD_REG_SET(TO, FROM) \ |
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143 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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144 | scan_tp_[0] = ~ scan_fp_[0]; \ |
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145 | scan_tp_[1] = ~ scan_fp_[1]; } while (0) |
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146 | |
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147 | #define AND_HARD_REG_SET(TO, FROM) \ |
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148 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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149 | scan_tp_[0] &= scan_fp_[0]; \ |
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150 | scan_tp_[1] &= scan_fp_[1]; } while (0) |
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151 | |
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152 | #define AND_COMPL_HARD_REG_SET(TO, FROM) \ |
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153 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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154 | scan_tp_[0] &= ~ scan_fp_[0]; \ |
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155 | scan_tp_[1] &= ~ scan_fp_[1]; } while (0) |
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156 | |
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157 | #define IOR_HARD_REG_SET(TO, FROM) \ |
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158 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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159 | scan_tp_[0] |= scan_fp_[0]; \ |
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160 | scan_tp_[1] |= scan_fp_[1]; } while (0) |
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161 | |
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162 | #define IOR_COMPL_HARD_REG_SET(TO, FROM) \ |
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163 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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164 | scan_tp_[0] |= ~ scan_fp_[0]; \ |
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165 | scan_tp_[1] |= ~ scan_fp_[1]; } while (0) |
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166 | |
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167 | #define GO_IF_HARD_REG_SUBSET(X,Y,TO) \ |
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168 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
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169 | if ((0 == (scan_xp_[0] & ~ scan_yp_[0])) \ |
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170 | && (0 == (scan_xp_[1] & ~ scan_yp_[1]))) \ |
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171 | goto TO; } while (0) |
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172 | |
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173 | #define GO_IF_HARD_REG_EQUAL(X,Y,TO) \ |
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174 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
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175 | if ((scan_xp_[0] == scan_yp_[0]) \ |
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176 | && (scan_xp_[1] == scan_yp_[1])) \ |
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177 | goto TO; } while (0) |
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178 | |
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179 | #else |
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180 | #if FIRST_PSEUDO_REGISTER <= 3*HOST_BITS_PER_WIDE_INT |
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181 | #define CLEAR_HARD_REG_SET(TO) \ |
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182 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
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183 | scan_tp_[0] = 0; \ |
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184 | scan_tp_[1] = 0; \ |
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185 | scan_tp_[2] = 0; } while (0) |
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186 | |
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187 | #define SET_HARD_REG_SET(TO) \ |
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188 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
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189 | scan_tp_[0] = -1; \ |
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190 | scan_tp_[1] = -1; \ |
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191 | scan_tp_[2] = -1; } while (0) |
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192 | |
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193 | #define COPY_HARD_REG_SET(TO, FROM) \ |
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194 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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195 | scan_tp_[0] = scan_fp_[0]; \ |
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196 | scan_tp_[1] = scan_fp_[1]; \ |
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197 | scan_tp_[2] = scan_fp_[2]; } while (0) |
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198 | |
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199 | #define COMPL_HARD_REG_SET(TO, FROM) \ |
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200 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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201 | scan_tp_[0] = ~ scan_fp_[0]; \ |
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202 | scan_tp_[1] = ~ scan_fp_[1]; \ |
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203 | scan_tp_[2] = ~ scan_fp_[2]; } while (0) |
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204 | |
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205 | #define AND_HARD_REG_SET(TO, FROM) \ |
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206 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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207 | scan_tp_[0] &= scan_fp_[0]; \ |
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208 | scan_tp_[1] &= scan_fp_[1]; \ |
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209 | scan_tp_[2] &= scan_fp_[2]; } while (0) |
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210 | |
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211 | #define AND_COMPL_HARD_REG_SET(TO, FROM) \ |
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212 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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213 | scan_tp_[0] &= ~ scan_fp_[0]; \ |
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214 | scan_tp_[1] &= ~ scan_fp_[1]; \ |
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215 | scan_tp_[2] &= ~ scan_fp_[2]; } while (0) |
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216 | |
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217 | #define IOR_HARD_REG_SET(TO, FROM) \ |
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218 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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219 | scan_tp_[0] |= scan_fp_[0]; \ |
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220 | scan_tp_[1] |= scan_fp_[1]; \ |
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221 | scan_tp_[2] |= scan_fp_[2]; } while (0) |
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222 | |
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223 | #define IOR_COMPL_HARD_REG_SET(TO, FROM) \ |
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224 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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225 | scan_tp_[0] |= ~ scan_fp_[0]; \ |
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226 | scan_tp_[1] |= ~ scan_fp_[1]; \ |
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227 | scan_tp_[2] |= ~ scan_fp_[2]; } while (0) |
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228 | |
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229 | #define GO_IF_HARD_REG_SUBSET(X,Y,TO) \ |
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230 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
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231 | if ((0 == (scan_xp_[0] & ~ scan_yp_[0])) \ |
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232 | && (0 == (scan_xp_[1] & ~ scan_yp_[1])) \ |
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233 | && (0 == (scan_xp_[2] & ~ scan_yp_[2]))) \ |
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234 | goto TO; } while (0) |
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235 | |
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236 | #define GO_IF_HARD_REG_EQUAL(X,Y,TO) \ |
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237 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
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238 | if ((scan_xp_[0] == scan_yp_[0]) \ |
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239 | && (scan_xp_[1] == scan_yp_[1]) \ |
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240 | && (scan_xp_[2] == scan_yp_[2])) \ |
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241 | goto TO; } while (0) |
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242 | |
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243 | #else |
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244 | #if FIRST_PSEUDO_REGISTER <= 4*HOST_BITS_PER_WIDE_INT |
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245 | #define CLEAR_HARD_REG_SET(TO) \ |
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246 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
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247 | scan_tp_[0] = 0; \ |
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248 | scan_tp_[1] = 0; \ |
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249 | scan_tp_[2] = 0; \ |
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250 | scan_tp_[3] = 0; } while (0) |
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251 | |
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252 | #define SET_HARD_REG_SET(TO) \ |
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253 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
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254 | scan_tp_[0] = -1; \ |
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255 | scan_tp_[1] = -1; \ |
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256 | scan_tp_[2] = -1; \ |
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257 | scan_tp_[3] = -1; } while (0) |
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258 | |
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259 | #define COPY_HARD_REG_SET(TO, FROM) \ |
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260 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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261 | scan_tp_[0] = scan_fp_[0]; \ |
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262 | scan_tp_[1] = scan_fp_[1]; \ |
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263 | scan_tp_[2] = scan_fp_[2]; \ |
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264 | scan_tp_[3] = scan_fp_[3]; } while (0) |
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265 | |
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266 | #define COMPL_HARD_REG_SET(TO, FROM) \ |
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267 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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268 | scan_tp_[0] = ~ scan_fp_[0]; \ |
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269 | scan_tp_[1] = ~ scan_fp_[1]; \ |
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270 | scan_tp_[2] = ~ scan_fp_[2]; \ |
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271 | scan_tp_[3] = ~ scan_fp_[3]; } while (0) |
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272 | |
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273 | #define AND_HARD_REG_SET(TO, FROM) \ |
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274 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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275 | scan_tp_[0] &= scan_fp_[0]; \ |
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276 | scan_tp_[1] &= scan_fp_[1]; \ |
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277 | scan_tp_[2] &= scan_fp_[2]; \ |
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278 | scan_tp_[3] &= scan_fp_[3]; } while (0) |
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279 | |
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280 | #define AND_COMPL_HARD_REG_SET(TO, FROM) \ |
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281 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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282 | scan_tp_[0] &= ~ scan_fp_[0]; \ |
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283 | scan_tp_[1] &= ~ scan_fp_[1]; \ |
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284 | scan_tp_[2] &= ~ scan_fp_[2]; \ |
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285 | scan_tp_[3] &= ~ scan_fp_[3]; } while (0) |
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286 | |
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287 | #define IOR_HARD_REG_SET(TO, FROM) \ |
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288 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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289 | scan_tp_[0] |= scan_fp_[0]; \ |
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290 | scan_tp_[1] |= scan_fp_[1]; \ |
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291 | scan_tp_[2] |= scan_fp_[2]; \ |
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292 | scan_tp_[3] |= scan_fp_[3]; } while (0) |
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293 | |
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294 | #define IOR_COMPL_HARD_REG_SET(TO, FROM) \ |
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295 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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296 | scan_tp_[0] |= ~ scan_fp_[0]; \ |
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297 | scan_tp_[1] |= ~ scan_fp_[1]; \ |
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298 | scan_tp_[2] |= ~ scan_fp_[2]; \ |
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299 | scan_tp_[3] |= ~ scan_fp_[3]; } while (0) |
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300 | |
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301 | #define GO_IF_HARD_REG_SUBSET(X,Y,TO) \ |
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302 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
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303 | if ((0 == (scan_xp_[0] & ~ scan_yp_[0])) \ |
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304 | && (0 == (scan_xp_[1] & ~ scan_yp_[1])) \ |
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305 | && (0 == (scan_xp_[2] & ~ scan_yp_[2])) \ |
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306 | && (0 == (scan_xp_[3] & ~ scan_yp_[3]))) \ |
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307 | goto TO; } while (0) |
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308 | |
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309 | #define GO_IF_HARD_REG_EQUAL(X,Y,TO) \ |
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310 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
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311 | if ((scan_xp_[0] == scan_yp_[0]) \ |
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312 | && (scan_xp_[1] == scan_yp_[1]) \ |
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313 | && (scan_xp_[2] == scan_yp_[2]) \ |
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314 | && (scan_xp_[3] == scan_yp_[3])) \ |
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315 | goto TO; } while (0) |
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316 | |
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317 | #else /* FIRST_PSEUDO_REGISTER > 3*HOST_BITS_PER_WIDE_INT */ |
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318 | |
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319 | #define CLEAR_HARD_REG_SET(TO) \ |
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320 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
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321 | register int i; \ |
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322 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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323 | *scan_tp_++ = 0; } while (0) |
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324 | |
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325 | #define SET_HARD_REG_SET(TO) \ |
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326 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
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327 | register int i; \ |
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328 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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329 | *scan_tp_++ = -1; } while (0) |
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330 | |
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331 | #define COPY_HARD_REG_SET(TO, FROM) \ |
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332 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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333 | register int i; \ |
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334 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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335 | *scan_tp_++ = *scan_fp_++; } while (0) |
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336 | |
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337 | #define COMPL_HARD_REG_SET(TO, FROM) \ |
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338 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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339 | register int i; \ |
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340 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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341 | *scan_tp_++ = ~ *scan_fp_++; } while (0) |
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342 | |
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343 | #define AND_HARD_REG_SET(TO, FROM) \ |
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344 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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345 | register int i; \ |
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346 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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347 | *scan_tp_++ &= *scan_fp_++; } while (0) |
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348 | |
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349 | #define AND_COMPL_HARD_REG_SET(TO, FROM) \ |
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350 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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351 | register int i; \ |
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352 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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353 | *scan_tp_++ &= ~ *scan_fp_++; } while (0) |
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354 | |
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355 | #define IOR_HARD_REG_SET(TO, FROM) \ |
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356 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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357 | register int i; \ |
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358 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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359 | *scan_tp_++ |= *scan_fp_++; } while (0) |
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360 | |
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361 | #define IOR_COMPL_HARD_REG_SET(TO, FROM) \ |
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362 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
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363 | register int i; \ |
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364 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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365 | *scan_tp_++ |= ~ *scan_fp_++; } while (0) |
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366 | |
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367 | #define GO_IF_HARD_REG_SUBSET(X,Y,TO) \ |
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368 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
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369 | register int i; \ |
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370 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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371 | if (0 != (*scan_xp_++ & ~ *scan_yp_++)) break; \ |
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372 | if (i == HARD_REG_SET_LONGS) goto TO; } while (0) |
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373 | |
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374 | #define GO_IF_HARD_REG_EQUAL(X,Y,TO) \ |
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375 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
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376 | register int i; \ |
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377 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ |
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378 | if (*scan_xp_++ != *scan_yp_++) break; \ |
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379 | if (i == HARD_REG_SET_LONGS) goto TO; } while (0) |
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380 | |
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381 | #endif |
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382 | #endif |
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383 | #endif |
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384 | #endif |
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385 | |
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386 | /* Define some standard sets of registers. */ |
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387 | |
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388 | /* Indexed by hard register number, contains 1 for registers |
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389 | that are fixed use (stack pointer, pc, frame pointer, etc.). |
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390 | These are the registers that cannot be used to allocate |
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391 | a pseudo reg whose life does not cross calls. */ |
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392 | |
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393 | extern char fixed_regs[FIRST_PSEUDO_REGISTER]; |
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394 | |
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395 | /* The same info as a HARD_REG_SET. */ |
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396 | |
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397 | extern HARD_REG_SET fixed_reg_set; |
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398 | |
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399 | /* Indexed by hard register number, contains 1 for registers |
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400 | that are fixed use or are clobbered by function calls. |
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401 | These are the registers that cannot be used to allocate |
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402 | a pseudo reg whose life crosses calls. */ |
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403 | |
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404 | extern char call_used_regs[FIRST_PSEUDO_REGISTER]; |
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405 | |
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406 | /* The same info as a HARD_REG_SET. */ |
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407 | |
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408 | extern HARD_REG_SET call_used_reg_set; |
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409 | |
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410 | /* Registers that we don't want to caller save. */ |
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411 | extern HARD_REG_SET losing_caller_save_reg_set; |
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412 | |
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413 | /* Indexed by hard register number, contains 1 for registers that are |
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414 | fixed use -- i.e. in fixed_regs -- or a function value return register |
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415 | or STRUCT_VALUE_REGNUM or STATIC_CHAIN_REGNUM. These are the |
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416 | registers that cannot hold quantities across calls even if we are |
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417 | willing to save and restore them. */ |
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418 | |
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419 | extern char call_fixed_regs[FIRST_PSEUDO_REGISTER]; |
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420 | |
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421 | /* The same info as a HARD_REG_SET. */ |
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422 | |
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423 | extern HARD_REG_SET call_fixed_reg_set; |
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424 | |
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425 | /* Indexed by hard register number, contains 1 for registers |
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426 | that are being used for global register decls. |
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427 | These must be exempt from ordinary flow analysis |
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428 | and are also considered fixed. */ |
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429 | |
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430 | extern char global_regs[FIRST_PSEUDO_REGISTER]; |
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431 | |
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432 | /* Table of register numbers in the order in which to try to use them. */ |
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433 | |
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434 | #ifdef REG_ALLOC_ORDER /* Avoid undef symbol in certain broken linkers. */ |
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435 | extern int reg_alloc_order[FIRST_PSEUDO_REGISTER]; |
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436 | #endif |
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437 | |
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438 | /* For each reg class, a HARD_REG_SET saying which registers are in it. */ |
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439 | |
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440 | extern HARD_REG_SET reg_class_contents[]; |
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441 | |
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442 | /* For each reg class, number of regs it contains. */ |
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443 | |
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444 | extern int reg_class_size[N_REG_CLASSES]; |
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445 | |
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446 | /* For each reg class, table listing all the containing classes. */ |
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447 | |
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448 | extern enum reg_class reg_class_superclasses[N_REG_CLASSES][N_REG_CLASSES]; |
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449 | |
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450 | /* For each reg class, table listing all the classes contained in it. */ |
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451 | |
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452 | extern enum reg_class reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES]; |
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453 | |
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454 | /* For each pair of reg classes, |
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455 | a largest reg class contained in their union. */ |
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456 | |
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457 | extern enum reg_class reg_class_subunion[N_REG_CLASSES][N_REG_CLASSES]; |
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458 | |
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459 | /* For each pair of reg classes, |
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460 | the smallest reg class that contains their union. */ |
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461 | |
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462 | extern enum reg_class reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES]; |
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463 | |
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464 | /* Number of non-fixed registers. */ |
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465 | |
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466 | extern int n_non_fixed_regs; |
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467 | |
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468 | /* Vector indexed by hardware reg giving its name. */ |
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469 | |
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470 | extern char *reg_names[FIRST_PSEUDO_REGISTER]; |
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