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

   1 /* Common hooks for AArch64.
   2    Copyright (C) 2012-2014 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
  31 #ifdef  TARGET_BIG_ENDIAN_DEFAULT
  32 #undef  TARGET_DEFAULT_TARGET_FLAGS
  33 #define TARGET_DEFAULT_TARGET_FLAGS (MASK_BIG_END)
  34 #endif
  35
  36 #undef  TARGET_HANDLE_OPTION
  37 #define TARGET_HANDLE_OPTION aarch64_handle_option
  38
  39 #undef  TARGET_OPTION_OPTIMIZATION_TABLE
  40 #define TARGET_OPTION_OPTIMIZATION_TABLE aarch_option_optimization_table
  41
  42 /* Set default optimization options.  */
  43 static const struct default_options aarch_option_optimization_table[] =
  44   {
  45     /* Enable section anchors by default at -O1 or higher.  */
  46     { OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
  47     /* Enable -fsched-pressure by default when optimizing.  */
  48     { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
  49     /* Enable redundant extension instructions removal at -O2 and higher.  */
  50     { OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
  51     { OPT_LEVELS_NONE, 0, NULL, 0 }
  52   };
  53
  54 /* Implement TARGET_HANDLE_OPTION.
  55    This function handles the target specific options for CPU/target selection.
  56
  57    -mcpu=CPU is shorthand for -march=ARCH_FOR_CPU, -mtune=CPU.
  58    If either of -march or -mtune is given, they override their
  59    respective component of -mcpu.  This logic is implemented
  60    in config/aarch64/aarch64.c:aarch64_override_options.  */
  61
  62 static bool
  63 aarch64_handle_option (struct gcc_options *opts,
  64                        struct gcc_options *opts_set ATTRIBUTE_UNUSED,
  65                        const struct cl_decoded_option *decoded,
  66                        location_t loc ATTRIBUTE_UNUSED)
  67 {
  68   size_t code = decoded->opt_index;
  69   const char *arg = decoded->arg;
  70
  71   switch (code)
  72     {
  73     case OPT_march_:
  74       opts->x_aarch64_arch_string = arg;
  75       return true;
  76
  77     case OPT_mcpu_:
  78       opts->x_aarch64_cpu_string = arg;
  79       return true;
  80
  81     case OPT_mtune_:
  82       opts->x_aarch64_tune_string = arg;
  83       return true;
  84
  85     default:
  86       return true;
  87     }
  88 }
  89
  90 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
  91
  92 #define AARCH64_CPU_NAME_LENGTH 20
  93
  94 /* Truncate NAME at the first '.' character seen, or return
  95    NAME unmodified.  */
  96
  97 const char *
  98 aarch64_rewrite_selected_cpu (const char *name)
  99 {
 100   static char output_buf[AARCH64_CPU_NAME_LENGTH + 1] = {0};
 101   char *arg_pos;
 102
 103   strncpy (output_buf, name, AARCH64_CPU_NAME_LENGTH);
 104   arg_pos = strchr (output_buf, '.');
 105
 106   /* If we found a '.' truncate the entry at that point.  */
 107   if (arg_pos)
 108     *arg_pos = '\0';
 109
 110   return output_buf;
 111 }
 112
 113 /* Called by the driver to rewrite a name passed to the -mcpu
 114    argument in preparation to be passed to the assembler.  The
 115    names passed from the commend line will be in ARGV, we want
 116    to use the right-most argument, which should be in
 117    ARGV[ARGC - 1].  ARGC should always be greater than 0.  */
 118
 119 const char *
 120 aarch64_rewrite_mcpu (int argc, const char **argv)
 121 {
 122   gcc_assert (argc);
 123   return aarch64_rewrite_selected_cpu (argv[argc - 1]);
 124 }
 125
 126 #undef AARCH64_CPU_NAME_LENGTH
 127