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1 /* Subroutines for the gcc driver.
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2 Copyright (C) 2007, 2008 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC 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 3, or (at your option)
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9 any later version.
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10
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11 GCC 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 GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "tm.h"
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24 #include <stdlib.h>
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25
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26 #ifdef _AIX
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27 # include <sys/systemcfg.h>
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28 #endif
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29
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30 #ifdef __linux__
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31 # include <link.h>
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32 #endif
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33
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34 #if defined (__APPLE__) || (__FreeBSD__)
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35 # include <sys/types.h>
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36 # include <sys/sysctl.h>
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37 #endif
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38
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39 const char *host_detect_local_cpu (int argc, const char **argv);
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40
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41 #if GCC_VERSION >= 0
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42
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43 /* Returns parameters that describe L1_ASSOC associative cache of size
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44 L1_SIZEKB with lines of size L1_LINE, and L2_SIZEKB. */
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45
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46 static char *
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47 describe_cache (unsigned l1_sizekb, unsigned l1_line,
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48 unsigned l1_assoc ATTRIBUTE_UNUSED, unsigned l2_sizekb)
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49 {
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50 char l1size[1000], line[1000], l2size[1000];
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51
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52 /* At the moment, gcc middle-end does not use the information about the
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53 associativity of the cache. */
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54
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55 sprintf (l1size, "--param l1-cache-size=%u", l1_sizekb);
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56 sprintf (line, "--param l1-cache-line-size=%u", l1_line);
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57 sprintf (l2size, "--param l2-cache-size=%u", l2_sizekb);
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58
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59 return concat (l1size, " ", line, " ", l2size, " ", NULL);
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60 }
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61
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62 #ifdef __APPLE__
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63
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64 /* Returns the description of caches on Darwin. */
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65
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66 static char *
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67 detect_caches_darwin (void)
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68 {
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69 unsigned l1_sizekb, l1_line, l1_assoc, l2_sizekb;
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70 size_t len = 4;
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71 static int l1_size_name[2] = { CTL_HW, HW_L1DCACHESIZE };
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72 static int l1_line_name[2] = { CTL_HW, HW_CACHELINE };
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73 static int l2_size_name[2] = { CTL_HW, HW_L2CACHESIZE };
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74
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75 sysctl (l1_size_name, 2, &l1_sizekb, &len, NULL, 0);
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76 sysctl (l1_line_name, 2, &l1_line, &len, NULL, 0);
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77 sysctl (l2_size_name, 2, &l2_sizekb, &len, NULL, 0);
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78 l1_assoc = 0;
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79
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80 return describe_cache (l1_sizekb / 1024, l1_line, l1_assoc,
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81 l2_sizekb / 1024);
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82 }
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83
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84 static const char *
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85 detect_processor_darwin (void)
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86 {
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87 unsigned int proc;
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88 size_t len = 4;
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89
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90 sysctlbyname ("hw.cpusubtype", &proc, &len, NULL, 0);
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91
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92 if (len > 0)
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93 switch (proc)
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94 {
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95 case 1:
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96 return "601";
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97 case 2:
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98 return "602";
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99 case 3:
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100 return "603";
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101 case 4:
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102 case 5:
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103 return "603e";
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104 case 6:
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105 return "604";
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106 case 7:
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107 return "604e";
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108 case 8:
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109 return "620";
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110 case 9:
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111 return "750";
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112 case 10:
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113 return "7400";
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114 case 11:
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115 return "7450";
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116 case 100:
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117 return "970";
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118 default:
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119 return "powerpc";
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120 }
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121
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122 return "powerpc";
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123 }
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124
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125 #endif /* __APPLE__ */
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126
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127 #ifdef __FreeBSD__
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128
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129 /* Returns the description of caches on FreeBSD PPC. */
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130
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131 static char *
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132 detect_caches_freebsd (void)
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133 {
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134 unsigned l1_sizekb, l1_line, l1_assoc, l2_sizekb;
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135 size_t len = 4;
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136
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137 /* Currently, as of FreeBSD-7.0, there is only the cacheline_size
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138 available via sysctl. */
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139 sysctlbyname ("machdep.cacheline_size", &l1_line, &len, NULL, 0);
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140
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141 l1_sizekb = 32;
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142 l1_assoc = 0;
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143 l2_sizekb = 512;
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144
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145 return describe_cache (l1_sizekb, l1_line, l1_assoc, l2_sizekb);
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146 }
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147
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148 /* Currently returns default powerpc. */
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149 static const char *
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150 detect_processor_freebsd (void)
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151 {
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152 return "powerpc";
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153 }
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154
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155 #endif /* __FreeBSD__ */
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156
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157 #ifdef __linux__
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158
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159 /* Returns AT_PLATFORM if present, otherwise generic PowerPC. */
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160
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161 static const char *
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162 elf_platform (void)
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163 {
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164 int fd;
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165
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166 fd = open ("/proc/self/auxv", O_RDONLY);
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167
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168 if (fd != -1)
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169 {
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170 char buf[1024];
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171 ElfW(auxv_t) *av;
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172 ssize_t n;
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173
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174 n = read (fd, buf, sizeof (buf));
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175 close (fd);
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176
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177 if (n > 0)
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178 {
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179 for (av = (ElfW(auxv_t) *) buf; av->a_type != AT_NULL; ++av)
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180 switch (av->a_type)
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181 {
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182 case AT_PLATFORM:
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183 return (const char *) av->a_un.a_val;
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184
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185 default:
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186 break;
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187 }
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188 }
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189 }
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190 return NULL;
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191 }
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192
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193 /* Returns AT_PLATFORM if present, otherwise generic 32. */
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194
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195 static int
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196 elf_dcachebsize (void)
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197 {
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198 int fd;
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199
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200 fd = open ("/proc/self/auxv", O_RDONLY);
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201
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202 if (fd != -1)
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203 {
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204 char buf[1024];
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205 ElfW(auxv_t) *av;
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206 ssize_t n;
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207
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208 n = read (fd, buf, sizeof (buf));
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209 close (fd);
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210
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211 if (n > 0)
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212 {
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213 for (av = (ElfW(auxv_t) *) buf; av->a_type != AT_NULL; ++av)
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214 switch (av->a_type)
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215 {
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216 case AT_DCACHEBSIZE:
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217 return av->a_un.a_val;
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218
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219 default:
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220 break;
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221 }
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222 }
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223 }
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224 return 32;
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225 }
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226
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227 /* Returns the description of caches on Linux. */
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228
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229 static char *
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230 detect_caches_linux (void)
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231 {
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232 unsigned l1_sizekb, l1_line, l1_assoc, l2_sizekb;
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233 const char *platform;
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234
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235 platform = elf_platform ();
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236
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237 if (platform != NULL)
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238 {
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239 l1_line = 128;
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240
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241 if (platform[5] == '6')
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242 /* POWER6 and POWER6x */
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243 l1_sizekb = 64;
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244 else
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245 l1_sizekb = 32;
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246 }
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247 else
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248 {
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249 l1_line = elf_dcachebsize ();
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250 l1_sizekb = 32;
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251 }
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252
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253 l1_assoc = 0;
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254 l2_sizekb = 512;
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255
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256 return describe_cache (l1_sizekb, l1_line, l1_assoc, l2_sizekb);
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257 }
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258
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259 static const char *
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260 detect_processor_linux (void)
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261 {
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262 const char *platform;
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263
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264 platform = elf_platform ();
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265
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266 if (platform != NULL)
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267 return platform;
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268 else
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269 return "powerpc";
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270 }
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271
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272 #endif /* __linux__ */
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273
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274 #ifdef _AIX
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275 /* Returns the description of caches on AIX. */
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276
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277 static char *
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278 detect_caches_aix (void)
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279 {
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280 unsigned l1_sizekb, l1_line, l1_assoc, l2_sizekb;
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281
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282 l1_sizekb = _system_configuration.dcache_size / 1024;
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283 l1_line = _system_configuration.dcache_line;
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284 l1_assoc = _system_configuration.dcache_asc;
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285 l2_sizekb = _system_configuration.L2_cache_size / 1024;
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286
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287 return describe_cache (l1_sizekb, l1_line, l1_assoc, l2_sizekb);
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288 }
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289
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290
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291 /* Returns the processor implementation on AIX. */
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292
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293 static const char *
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294 detect_processor_aix (void)
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295 {
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296 switch (_system_configuration.implementation)
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297 {
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298 case 0x0001:
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299 return "rios1";
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300
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301 case 0x0002:
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302 return "rsc";
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303
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304 case 0x0004:
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305 return "rios2";
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306
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307 case 0x0008:
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308 return "601";
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309
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310 case 0x0020:
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311 return "603";
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312
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313 case 0x0010:
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314 return "604";
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315
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316 case 0x0040:
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317 return "620";
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318
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319 case 0x0080:
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320 return "630";
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321
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322 case 0x0100:
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323 case 0x0200:
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324 case 0x0400:
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325 return "rs64";
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326
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327 case 0x0800:
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328 return "power4";
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329
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330 case 0x2000:
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331 if (_system_configuration.version == 0x0F0000)
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332 return "power5";
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333 else
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334 return "power5+";
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335
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336 case 0x4000:
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337 return "power6";
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338
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339 default:
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340 return "powerpc";
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341 }
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342 }
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343 #endif /* _AIX */
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344
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345
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346 /* This will be called by the spec parser in gcc.c when it sees
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347 a %:local_cpu_detect(args) construct. Currently it will be called
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348 with either "arch" or "tune" as argument depending on if -march=native
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349 or -mtune=native is to be substituted.
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350
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351 It returns a string containing new command line parameters to be
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352 put at the place of the above two options, depending on what CPU
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353 this is executed.
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354
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355 ARGC and ARGV are set depending on the actual arguments given
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356 in the spec. */
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357 const char
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358 *host_detect_local_cpu (int argc, const char **argv)
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359 {
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360 const char *cpu = NULL;
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361 const char *cache = "";
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362 const char *options = "";
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363 bool arch;
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364
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365 if (argc < 1)
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366 return NULL;
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367
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368 arch = strcmp (argv[0], "cpu") == 0;
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369 if (!arch && strcmp (argv[0], "tune"))
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370 return NULL;
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371
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372 #if defined (_AIX)
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373 cache = detect_caches_aix ();
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374 #elif defined (__APPLE__)
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375 cache = detect_caches_darwin ();
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376 #elif defined (__FreeBSD__)
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377 cache = detect_caches_freebsd ();
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378 /* FreeBSD PPC does not provide any cache information yet. */
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379 cache = "";
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380 #elif defined (__linux__)
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381 cache = detect_caches_linux ();
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382 /* PPC Linux does not provide any cache information yet. */
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383 cache = "";
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384 #else
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385 cache = "";
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386 #endif
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387
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388 #if defined (_AIX)
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389 cpu = detect_processor_aix ();
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390 #elif defined (__APPLE__)
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391 cpu = detect_processor_darwin ();
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392 #elif defined (__FreeBSD__)
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393 cpu = detect_processor_freebsd ();
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394 #elif defined (__linux__)
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395 cpu = detect_processor_linux ();
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396 #else
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397 cpu = "powerpc";
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398 #endif
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399
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400 return concat (cache, "-m", argv[0], "=", cpu, " ", options, NULL);
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401 }
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402
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403 #else /* GCC_VERSION */
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404
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405 /* If we aren't compiling with GCC we just provide a minimal
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406 default value. */
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407 const char *host_detect_local_cpu (int argc, const char **argv)
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408 {
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409 const char *cpu;
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410 bool arch;
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411
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412 if (argc < 1)
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413 return NULL;
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414
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415 arch = strcmp (argv[0], "cpu") == 0;
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416 if (!arch && strcmp (argv[0], "tune"))
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417 return NULL;
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418
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419 if (arch)
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420 cpu = "powerpc";
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421
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422 return concat ("-m", argv[0], "=", cpu, NULL);
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423 }
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424
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425 #endif /* GCC_VERSION */
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426
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