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1 /* Subroutines for the gcc driver.
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2 Copyright (C) 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
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25 /* This will be called by the spec parser in gcc.c when it sees
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26 a %:local_cpu_detect(args) construct. Currently it will be called
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27 with either "arch" or "tune" as argument depending on if -march=native
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28 or -mtune=native is to be substituted.
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29
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30 It returns a string containing new command line parameters to be
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31 put at the place of the above two options, depending on what CPU
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32 this is executed. E.g. "-march=loongson2f" on a Loongson 2F for
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33 -march=native. If the routine can't detect a known processor,
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34 the -march or -mtune option is discarded.
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35
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36 ARGC and ARGV are set depending on the actual arguments given
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37 in the spec. */
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38 const char *
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39 host_detect_local_cpu (int argc, const char **argv)
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40 {
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41 const char *cpu = NULL;
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42 char buf[128];
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43 FILE *f;
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44 bool arch;
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45
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46 if (argc < 1)
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47 return NULL;
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48
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49 arch = strcmp (argv[0], "arch") == 0;
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50 if (!arch && strcmp (argv[0], "tune"))
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51 return NULL;
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52
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53 f = fopen ("/proc/cpuinfo", "r");
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54 if (f == NULL)
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55 return NULL;
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56
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57 while (fgets (buf, sizeof (buf), f) != NULL)
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58 if (strncmp (buf, "cpu model", sizeof ("cpu model") - 1) == 0)
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59 {
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60 if (strstr (buf, "Godson2 V0.2") != NULL
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61 || strstr (buf, "Loongson-2 V0.2") != NULL)
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62 cpu = "loongson2e";
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63 else if (strstr (buf, "Godson2 V0.3") != NULL
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64 || strstr (buf, "Loongson-2 V0.3") != NULL)
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65 cpu = "loongson2f";
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66 else if (strstr (buf, "SiByte SB1") != NULL)
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67 cpu = "sb1";
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68 else if (strstr (buf, "R5000") != NULL)
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69 cpu = "r5000";
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70 else if (strstr (buf, "Octeon") != NULL)
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71 cpu = "octeon";
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72 break;
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73 }
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74
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75 fclose (f);
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76
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77 if (cpu == NULL)
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78 return NULL;
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79
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80 return concat ("-m", argv[0], "=", cpu, NULL);
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81 }
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