gcc/config/alpha/driver-alpha.c

   1 /* Subroutines for the gcc driver.
   2    Copyright (C) 2009-2013 Free Software Foundation, Inc.
   3    Contributed by Arthur Loiret <aloiret@debian.org>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25
  26 /* Chip family type IDs, returned by implver instruction.  */
  27 #define IMPLVER_EV4_FAMILY      0               /* LCA/EV4/EV45 */
  28 #define IMPLVER_EV5_FAMILY      1               /* EV5/EV56/PCA56 */
  29 #define IMPLVER_EV6_FAMILY      2               /* EV6 */
  30 #define IMPLVER_EV7_FAMILY      3               /* EV7 */
  31
  32 /* Bit defines for amask instruction.  */
  33 #define AMASK_BWX          0x1          /* byte/word extension.  */
  34 #define AMASK_FIX          0x2          /* sqrt and f <-> i conversions
  35                                            extension.  */
  36 #define AMASK_CIX          0x4          /* count extension.  */
  37 #define AMASK_MVI          0x100        /* multimedia extension.  */
  38 #define AMASK_PRECISE      0x200        /* Precise arithmetic traps.  */
  39 #define AMASK_LOCKPFTCHOK  0x1000       /* Safe to prefetch lock cache
  40                                            block.  */
  41
  42 /* This will be called by the spec parser in gcc.c when it sees
  43    a %:local_cpu_detect(args) construct.  Currently it will be called
  44    with either "cpu" or "tune" as argument depending on if -mcpu=native
  45    or -mtune=native is to be substituted.
  46
  47    It returns a string containing new command line parameters to be
  48    put at the place of the above two options, depending on what CPU
  49    this is executed.  E.g. "-mcpu=ev6" on an Alpha 21264 for
  50    -mcpu=native.  If the routine can't detect a known processor,
  51    the -mcpu or -mtune option is discarded.
  52
  53    ARGC and ARGV are set depending on the actual arguments given
  54    in the spec.  */
  55 const char *
  56 host_detect_local_cpu (int argc, const char **argv)
  57 {
  58   static const struct cpu_types {
  59     long implver;
  60     long amask;
  61     const char *const cpu;
  62   } cpu_types[] = {
  63     { IMPLVER_EV7_FAMILY, AMASK_BWX|AMASK_MVI|AMASK_FIX|AMASK_CIX, "ev67" },
  64     { IMPLVER_EV6_FAMILY, AMASK_BWX|AMASK_MVI|AMASK_FIX|AMASK_CIX, "ev67" },
  65     { IMPLVER_EV6_FAMILY, AMASK_BWX|AMASK_MVI|AMASK_FIX, "ev6" },
  66     { IMPLVER_EV5_FAMILY, AMASK_BWX|AMASK_MVI, "pca56" },
  67     { IMPLVER_EV5_FAMILY, AMASK_BWX, "ev56" },
  68     { IMPLVER_EV5_FAMILY, 0, "ev5" },
  69     { IMPLVER_EV4_FAMILY, 0, "ev4" },
  70     { 0, 0, NULL }
  71   };
  72   long implver;
  73   long amask;
  74   const char *cpu;
  75   int i;
  76
  77   if (argc < 1)
  78     return NULL;
  79
  80   if (strcmp (argv[0], "cpu") && strcmp (argv[0], "tune"))
  81     return NULL;
  82
  83   implver = __builtin_alpha_implver ();
  84   amask = __builtin_alpha_amask (~0L);
  85   cpu = NULL;
  86
  87   for (i = 0; cpu_types[i].cpu != NULL; i++)
  88     if (implver == cpu_types[i].implver
  89         && (~amask & cpu_types[i].amask) == cpu_types[i].amask)
  90       {
  91         cpu = cpu_types[i].cpu;
  92         break;
  93       }
  94
  95   if (cpu == NULL)
  96     return NULL;
  97
  98   return concat ("-m", argv[0], "=", cpu, NULL);
  99 }