gcc/common/config/aarch64/aarch64-common.c

   1 /* Common hooks for AArch64.
   2    Copyright (C) 2012-2015 Free Software Foundation, Inc.
   3    Contributed by ARM Ltd.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    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 #include "tm_p.h"
  26 #include "common/common-target.h"
  27 #include "common/common-target-def.h"
  28 #include "opts.h"
  29 #include "flags.h"
  30 #include "errors.h"
  31
  32 #ifdef  TARGET_BIG_ENDIAN_DEFAULT
  33 #undef  TARGET_DEFAULT_TARGET_FLAGS
  34 #define TARGET_DEFAULT_TARGET_FLAGS (MASK_BIG_END)
  35 #endif
  36
  37 #undef  TARGET_HANDLE_OPTION
  38 #define TARGET_HANDLE_OPTION aarch64_handle_option
  39
  40 #undef  TARGET_OPTION_OPTIMIZATION_TABLE
  41 #define TARGET_OPTION_OPTIMIZATION_TABLE aarch_option_optimization_table
  42
  43 /* Set default optimization options.  */
  44 static const struct default_options aarch_option_optimization_table[] =
  45   {
  46     /* Enable section anchors by default at -O1 or higher.  */
  47     { OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
  48     /* Enable -fsched-pressure by default when optimizing.  */
  49     { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
  50     /* Enable redundant extension instructions removal at -O2 and higher.  */
  51     { OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
  52     { OPT_LEVELS_NONE, 0, NULL, 0 }
  53   };
  54
  55 /* Implement TARGET_HANDLE_OPTION.
  56    This function handles the target specific options for CPU/target selection.
  57
  58    -mcpu=CPU is shorthand for -march=ARCH_FOR_CPU, -mtune=CPU.
  59    If either of -march or -mtune is given, they override their
  60    respective component of -mcpu.  This logic is implemented
  61    in config/aarch64/aarch64.c:aarch64_override_options.  */
  62
  63 static bool
  64 aarch64_handle_option (struct gcc_options *opts,
  65                        struct gcc_options *opts_set ATTRIBUTE_UNUSED,
  66                        const struct cl_decoded_option *decoded,
  67                        location_t loc ATTRIBUTE_UNUSED)
  68 {
  69   size_t code = decoded->opt_index;
  70   const char *arg = decoded->arg;
  71
  72   switch (code)
  73     {
  74     case OPT_march_:
  75       opts->x_aarch64_arch_string = arg;
  76       return true;
  77
  78     case OPT_mcpu_:
  79       opts->x_aarch64_cpu_string = arg;
  80       return true;
  81
  82     case OPT_mtune_:
  83       opts->x_aarch64_tune_string = arg;
  84       return true;
  85
  86     default:
  87       return true;
  88     }
  89 }
  90
  91 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
  92
  93 #define AARCH64_CPU_NAME_LENGTH 128
  94
  95 /* Truncate NAME at the first '.' character seen up to the first '+'
  96    or return NAME unmodified.  */
  97
  98 const char *
  99 aarch64_rewrite_selected_cpu (const char *name)
 100 {
 101   static char output_buf[AARCH64_CPU_NAME_LENGTH + 1] = {0};
 102   const char *bL_sep;
 103   const char *feats;
 104   size_t pref_size;
 105   size_t feat_size;
 106
 107   bL_sep = strchr (name, '.');
 108   if (!bL_sep)
 109     return name;
 110
 111   feats = strchr (name, '+');
 112   feat_size = feats ? strnlen (feats, AARCH64_CPU_NAME_LENGTH) : 0;
 113   pref_size = bL_sep - name;
 114
 115   if ((feat_size + pref_size) > AARCH64_CPU_NAME_LENGTH)
 116     internal_error ("-mcpu string too large");
 117
 118   strncpy (output_buf, name, pref_size);
 119   if (feats)
 120     strncpy (output_buf + pref_size, feats, feat_size);
 121
 122   return output_buf;
 123 }
 124
 125 /* Called by the driver to rewrite a name passed to the -mcpu
 126    argument in preparation to be passed to the assembler.  The
 127    names passed from the commend line will be in ARGV, we want
 128    to use the right-most argument, which should be in
 129    ARGV[ARGC - 1].  ARGC should always be greater than 0.  */
 130
 131 const char *
 132 aarch64_rewrite_mcpu (int argc, const char **argv)
 133 {
 134   gcc_assert (argc);
 135   return aarch64_rewrite_selected_cpu (argv[argc - 1]);
 136 }
 137
 138 #undef AARCH64_CPU_NAME_LENGTH
 139