gcc/config/mips/driver-native.c

   1 /* Subroutines for the gcc driver.
   2    Copyright (C) 2008 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22
  23 /* This will be called by the spec parser in gcc.c when it sees
  24    a %:local_cpu_detect(args) construct.  Currently it will be called
  25    with either "arch" or "tune" as argument depending on if -march=native
  26    or -mtune=native is to be substituted.
  27
  28    It returns a string containing new command line parameters to be
  29    put at the place of the above two options, depending on what CPU
  30    this is executed.  E.g. "-march=loongson2f" on a Loongson 2F for
  31    -march=native.  If the routine can't detect a known processor,
  32    the -march or -mtune option is discarded.
  33
  34    ARGC and ARGV are set depending on the actual arguments given
  35    in the spec.  */
  36 const char *
  37 host_detect_local_cpu (int argc, const char **argv)
  38 {
  39   const char *cpu = NULL;
  40   char buf[128];
  41   FILE *f;
  42   bool arch;
  43
  44   if (argc < 1)
  45     return NULL;
  46
  47   arch = strcmp (argv[0], "arch") == 0;
  48   if (!arch && strcmp (argv[0], "tune"))
  49     return NULL;
  50
  51   f = fopen ("/proc/cpuinfo", "r");
  52   if (f == NULL)
  53     return NULL;
  54
  55   while (fgets (buf, sizeof (buf), f) != NULL)
  56     if (strncmp (buf, "cpu model", sizeof ("cpu model") - 1) == 0)
  57       {
  58         if (strstr (buf, "Godson2 V0.2") != NULL
  59             || strstr (buf, "Loongson-2 V0.2") != NULL)
  60           cpu = "loongson2e";
  61         else if (strstr (buf, "Godson2 V0.3") != NULL
  62                  || strstr (buf, "Loongson-2 V0.3") != NULL)
  63           cpu = "loongson2f";
  64         break;
  65       }
  66
  67   fclose (f);
  68
  69   if (cpu == NULL)
  70     return NULL;
  71
  72   return concat ("-m", argv[0], "=", cpu, NULL);
  73 }