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/* Common hooks for AArch64.
Copyright (C) 2012-2014 Free Software Foundation, Inc.
Contributed by ARM Ltd.
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"
#include "tm_p.h"
#include "common/common-target.h"
#include "common/common-target-def.h"
#include "opts.h"
#include "flags.h"
#ifdef TARGET_BIG_ENDIAN_DEFAULT
#undef TARGET_DEFAULT_TARGET_FLAGS
#define TARGET_DEFAULT_TARGET_FLAGS (MASK_BIG_END)
#endif
#undef TARGET_HANDLE_OPTION
#define TARGET_HANDLE_OPTION aarch64_handle_option
#undef TARGET_OPTION_OPTIMIZATION_TABLE
#define TARGET_OPTION_OPTIMIZATION_TABLE aarch_option_optimization_table
/* Set default optimization options. */
static const struct default_options aarch_option_optimization_table[] =
{
/* Enable section anchors by default at -O1 or higher. */
{ OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
/* Enable -fsched-pressure by default when optimizing. */
{ OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
/* Enable redundant extension instructions removal at -O2 and higher. */
{ OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
};
/* Implement TARGET_HANDLE_OPTION.
This function handles the target specific options for CPU/target selection.
-mcpu=CPU is shorthand for -march=ARCH_FOR_CPU, -mtune=CPU.
If either of -march or -mtune is given, they override their
respective component of -mcpu. This logic is implemented
in config/aarch64/aarch64.c:aarch64_override_options. */
static bool
aarch64_handle_option (struct gcc_options *opts,
struct gcc_options *opts_set ATTRIBUTE_UNUSED,
const struct cl_decoded_option *decoded,
location_t loc ATTRIBUTE_UNUSED)
{
size_t code = decoded->opt_index;
const char *arg = decoded->arg;
switch (code)
{
case OPT_march_:
opts->x_aarch64_arch_string = arg;
return true;
case OPT_mcpu_:
opts->x_aarch64_cpu_string = arg;
return true;
case OPT_mtune_:
opts->x_aarch64_tune_string = arg;
return true;
default:
return true;
}
}
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
#define AARCH64_CPU_NAME_LENGTH 20
/* Truncate NAME at the first '.' character seen, or return
NAME unmodified. */
const char *
aarch64_rewrite_selected_cpu (const char *name)
{
static char output_buf[AARCH64_CPU_NAME_LENGTH + 1] = {0};
char *arg_pos;
strncpy (output_buf, name, AARCH64_CPU_NAME_LENGTH);
arg_pos = strchr (output_buf, '.');
/* If we found a '.' truncate the entry at that point. */
if (arg_pos)
*arg_pos = '\0';
return output_buf;
}
/* Called by the driver to rewrite a name passed to the -mcpu
argument in preparation to be passed to the assembler. The
names passed from the commend line will be in ARGV, we want
to use the right-most argument, which should be in
ARGV[ARGC - 1]. ARGC should always be greater than 0. */
const char *
aarch64_rewrite_mcpu (int argc, const char **argv)
{
gcc_assert (argc);
return aarch64_rewrite_selected_cpu (argv[argc - 1]);
}
#undef AARCH64_CPU_NAME_LENGTH
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