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/* Subroutines for the gcc driver.

   Copyright (C) 2009, 2011 Free Software Foundation, Inc.

   Contributed by Arthur Loiret <aloiret@debian.org>

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"

/* Chip family type IDs, returned by implver instruction.  */

#define IMPLVER_EV4_FAMILY      0                /* LCA/EV4/EV45 */

#define IMPLVER_EV5_FAMILY      1               /* EV5/EV56/PCA56 */

#define IMPLVER_EV6_FAMILY      2               /* EV6 */

#define IMPLVER_EV7_FAMILY      3               /* EV7 */

/* Bit defines for amask instruction.  */

#define AMASK_BWX          0x1          /* byte/word extension.  */

#define AMASK_FIX          0x2          /* sqrt and f <-> i conversions 

                                           extension.  */

#define AMASK_CIX          0x4          /* count extension.  */

#define AMASK_MVI          0x100        /* multimedia extension.  */

#define AMASK_PRECISE      0x200        /* Precise arithmetic traps.  */

#define AMASK_LOCKPFTCHOK  0x1000       /* Safe to prefetch lock cache

                                           block.  */

/* 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 "cpu" or "tune" as argument depending on if -mcpu=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. "-mcpu=ev6" on an Alpha 21264 for

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

   the -mcpu 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)

{

  static const struct cpu_types {

    long implver;

    long amask;

    const char *const cpu;

  } cpu_types[] = {

    { IMPLVER_EV7_FAMILY, AMASK_BWX|AMASK_MVI|AMASK_FIX|AMASK_CIX, "ev67" },

    { IMPLVER_EV6_FAMILY, AMASK_BWX|AMASK_MVI|AMASK_FIX|AMASK_CIX, "ev67" },

    { IMPLVER_EV6_FAMILY, AMASK_BWX|AMASK_MVI|AMASK_FIX, "ev6" },

    { IMPLVER_EV5_FAMILY, AMASK_BWX|AMASK_MVI, "pca56" },

    { IMPLVER_EV5_FAMILY, AMASK_BWX, "ev56" },

    { IMPLVER_EV5_FAMILY, 0, "ev5" },

    { IMPLVER_EV4_FAMILY, 0, "ev4" },

    { 0, 0, NULL }

  };

  long implver;

  long amask;

  const char *cpu;

  int i;

  if (argc < 1)

    return NULL;

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

    return NULL;

  implver = __builtin_alpha_implver ();

  amask = __builtin_alpha_amask (~0L);

  cpu = NULL;

  for (i = 0; cpu_types[i].cpu != NULL; i++)

    if (implver == cpu_types[i].implver

        && (~amask & cpu_types[i].amask) == cpu_types[i].amask)

      {

        cpu = cpu_types[i].cpu;

        break;

      }

  if (cpu == NULL)

    return NULL;

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

}