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/* Subroutines for the gcc driver.

   Copyright (C) 2008 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 3, or (at your option)

any later version.

GCC is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

/* This will be called by the spec parser in gcc.c when it sees

   a %:local_cpu_detect(args) construct.  Currently it will be called

   with either "arch" or "tune" as argument depending on if -march=native

   or -mtune=native is to be substituted.

   It returns a string containing new command line parameters to be

   put at the place of the above two options, depending on what CPU

   this is executed.  E.g. "-march=loongson2f" on a Loongson 2F for

   -march=native.  If the routine can't detect a known processor,

   the -march or -mtune option is discarded.

   ARGC and ARGV are set depending on the actual arguments given

   in the spec.  */

const char *

host_detect_local_cpu (int argc, const char **argv)

{

  const char *cpu = NULL;

  char buf[128];

  FILE *f;

  bool arch;

  if (argc < 1)

    return NULL;

  arch = strcmp (argv[0], "arch") == 0;

  if (!arch && strcmp (argv[0], "tune"))

    return NULL;

  f = fopen ("/proc/cpuinfo", "r");

  if (f == NULL)

    return NULL;

  while (fgets (buf, sizeof (buf), f) != NULL)

    if (strncmp (buf, "cpu model", sizeof ("cpu model") - 1) == 0)

      {

        if (strstr (buf, "Godson2 V0.2") != NULL

            || strstr (buf, "Loongson-2 V0.2") != NULL)

          cpu = "loongson2e";

        else if (strstr (buf, "Godson2 V0.3") != NULL

                 || strstr (buf, "Loongson-2 V0.3") != NULL)

          cpu = "loongson2f";

        else if (strstr (buf, "SiByte SB1") != NULL)

          cpu = "sb1";

        else if (strstr (buf, "R5000") != NULL)

          cpu = "r5000";

        else if (strstr (buf, "Octeon") != NULL)

          cpu = "octeon";

        break;

      }

  fclose (f);

  if (cpu == NULL)

    return NULL;

  return concat ("-m", argv[0], "=", cpu, NULL);

}