gcc/config/mips/driver-native.c

   1 /* Subroutines for the gcc driver.
   2    Copyright (C) 2008-2020 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 #define IN_TARGET_CODE 1
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26
  27 /* This will be called by the spec parser in gcc.c when it sees
  28    a %:local_cpu_detect(args) construct.  Currently it will be called
  29    with either "arch" or "tune" as argument depending on if -march=native
  30    or -mtune=native is to be substituted.
  31
  32    It returns a string containing new command line parameters to be
  33    put at the place of the above two options, depending on what CPU
  34    this is executed.  E.g. "-march=loongson2f" on a Loongson 2F for
  35    -march=native.  If the routine can't detect a known processor,
  36    the -march or -mtune option is discarded.
  37
  38    ARGC and ARGV are set depending on the actual arguments given
  39    in the spec.  */
  40 const char *
  41 host_detect_local_cpu (int argc, const char **argv)
  42 {
  43   const char *cpu = NULL;
  44   char buf[128];
  45   FILE *f;
  46   bool arch;
  47
  48   if (argc < 1)
  49     return NULL;
  50
  51   arch = strcmp (argv[0], "arch") == 0;
  52   if (!arch && strcmp (argv[0], "tune"))
  53     return NULL;
  54
  55   f = fopen ("/proc/cpuinfo", "r");
  56   if (f == NULL)
  57     return NULL;
  58
  59   while (fgets (buf, sizeof (buf), f) != NULL)
  60     if (strncmp (buf, "cpu model", sizeof ("cpu model") - 1) == 0)
  61       {
  62         if (strstr (buf, "Godson2 V0.2") != NULL
  63             || strstr (buf, "Loongson-2 V0.2") != NULL
  64             || strstr (buf, "Loongson-2E") != NULL)
  65           cpu = "loongson2e";
  66         else if (strstr (buf, "Godson2 V0.3") != NULL
  67                  || strstr (buf, "Loongson-2 V0.3") != NULL
  68                  || strstr (buf, "Loongson-2F") != NULL)
  69           cpu = "loongson2f";
  70         else if (strstr (buf, "Godson3 V0.5") != NULL
  71                  || strstr (buf, "Loongson-3 V0.5") != NULL
  72                  || strstr (buf, "Loongson-3A") != NULL)
  73           cpu = "loongson3a";
  74         else if (strstr (buf, "SiByte SB1") != NULL)
  75           cpu = "sb1";
  76         else if (strstr (buf, "R5000") != NULL)
  77           cpu = "r5000";
  78         else if (strstr (buf, "Octeon II") != NULL)
  79           cpu = "octeon2";
  80         else if (strstr (buf, "Octeon") != NULL)
  81           cpu = "octeon";
  82         break;
  83       }
  84
  85   fclose (f);
  86
  87   if (cpu == NULL)
  88     return NULL;
  89
  90   return concat ("-m", argv[0], "=", cpu, NULL);
  91 }