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 #include "coretypes.h"
  23 #include "tm.h"
  24
  25 /* This will be called by the spec parser in gcc.c when it sees
  26    a %:local_cpu_detect(args) construct.  Currently it will be called
  27    with either "arch" or "tune" as argument depending on if -march=native
  28    or -mtune=native is to be substituted.
  29
  30    It returns a string containing new command line parameters to be
  31    put at the place of the above two options, depending on what CPU
  32    this is executed.  E.g. "-march=loongson2f" on a Loongson 2F for
  33    -march=native.  If the routine can't detect a known processor,
  34    the -march or -mtune option is discarded.
  35
  36    ARGC and ARGV are set depending on the actual arguments given
  37    in the spec.  */
  38 const char *
  39 host_detect_local_cpu (int argc, const char **argv)
  40 {
  41   const char *cpu = NULL;
  42   char buf[128];
  43   FILE *f;
  44   bool arch;
  45
  46   if (argc < 1)
  47     return NULL;
  48
  49   arch = strcmp (argv[0], "arch") == 0;
  50   if (!arch && strcmp (argv[0], "tune"))
  51     return NULL;
  52
  53   f = fopen ("/proc/cpuinfo", "r");
  54   if (f == NULL)
  55     return NULL;
  56
  57   while (fgets (buf, sizeof (buf), f) != NULL)
  58     if (strncmp (buf, "cpu model", sizeof ("cpu model") - 1) == 0)
  59       {
  60         if (strstr (buf, "Godson2 V0.2") != NULL
  61             || strstr (buf, "Loongson-2 V0.2") != NULL)
  62           cpu = "loongson2e";
  63         else if (strstr (buf, "Godson2 V0.3") != NULL
  64                  || strstr (buf, "Loongson-2 V0.3") != NULL)
  65           cpu = "loongson2f";
  66         else if (strstr (buf, "SiByte SB1") != NULL)
  67           cpu = "sb1";
  68         else if (strstr (buf, "R5000") != NULL)
  69           cpu = "r5000";
  70         break;
  71       }
  72
  73   fclose (f);
  74
  75   if (cpu == NULL)
  76     return NULL;
  77
  78   return concat ("-m", argv[0], "=", cpu, NULL);
  79 }