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/* Common hooks for AArch64.
Copyright (C) 2012-2016 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"
#include "diagnostic.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. */
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;
int val = decoded->value;
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;
case OPT_mgeneral_regs_only:
opts->x_target_flags |= MASK_GENERAL_REGS_ONLY;
return true;
case OPT_mfix_cortex_a53_835769:
opts->x_aarch64_fix_a53_err835769 = val;
return true;
case OPT_mstrict_align:
opts->x_target_flags |= MASK_STRICT_ALIGN;
return true;
case OPT_momit_leaf_frame_pointer:
opts->x_flag_omit_frame_pointer = val;
return true;
default:
return true;
}
}
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
/* An ISA extension in the co-processor and main instruction set space. */
struct aarch64_option_extension
{
const char *const name;
const unsigned long flags_on;
const unsigned long flags_off;
};
/* ISA extensions in AArch64. */
static const struct aarch64_option_extension all_extensions[] =
{
#define AARCH64_OPT_EXTENSION(NAME, FLAGS_ON, FLAGS_OFF, FEATURE_STRING) \
{NAME, FLAGS_ON, FLAGS_OFF},
#include "config/aarch64/aarch64-option-extensions.def"
#undef AARCH64_OPT_EXTENSION
{NULL, 0, 0}
};
struct processor_name_to_arch
{
const std::string processor_name;
const enum aarch64_arch arch;
const unsigned long flags;
};
struct arch_to_arch_name
{
const enum aarch64_arch arch;
const std::string arch_name;
};
/* Map processor names to the architecture revision they implement and
the default set of architectural feature flags they support. */
static const struct processor_name_to_arch all_cores[] =
{
#define AARCH64_CORE(NAME, X, IDENT, ARCH_IDENT, FLAGS, COSTS, IMP, PART) \
{NAME, AARCH64_ARCH_##ARCH_IDENT, FLAGS},
#include "config/aarch64/aarch64-cores.def"
#undef AARCH64_CORE
{"generic", AARCH64_ARCH_8A, AARCH64_FL_FOR_ARCH8},
{"", aarch64_no_arch, 0}
};
/* Map architecture revisions to their string representation. */
static const struct arch_to_arch_name all_architectures[] =
{
#define AARCH64_ARCH(NAME, CORE, ARCH_IDENT, ARCH, FLAGS) \
{AARCH64_ARCH_##ARCH_IDENT, NAME},
#include "config/aarch64/aarch64-arches.def"
#undef AARCH64_ARCH
{aarch64_no_arch, ""}
};
/* Return a string representation of ISA_FLAGS. */
std::string
aarch64_get_extension_string_for_isa_flags (unsigned long isa_flags)
{
const struct aarch64_option_extension *opt = NULL;
std::string outstr = "";
for (opt = all_extensions; opt->name != NULL; opt++)
if ((isa_flags & opt->flags_on) == opt->flags_on)
{
outstr += "+";
outstr += opt->name;
}
return outstr;
}
/* Attempt to rewrite NAME, which has been passed on the command line
as a -mcpu option to an equivalent -march value. If we can do so,
return the new string, otherwise return an error. */
const char *
aarch64_rewrite_selected_cpu (const char *name)
{
std::string original_string (name);
std::string extensions;
std::string processor;
size_t extension_pos = original_string.find_first_of ('+');
/* Strip and save the extension string. */
if (extension_pos != std::string::npos)
{
processor = original_string.substr (0, extension_pos);
extensions = original_string.substr (extension_pos,
std::string::npos);
}
else
{
/* No extensions. */
processor = original_string;
}
const struct processor_name_to_arch* p_to_a;
for (p_to_a = all_cores;
p_to_a->arch != aarch64_no_arch;
p_to_a++)
{
if (p_to_a->processor_name == processor)
break;
}
const struct arch_to_arch_name* a_to_an;
for (a_to_an = all_architectures;
a_to_an->arch != aarch64_no_arch;
a_to_an++)
{
if (a_to_an->arch == p_to_a->arch)
break;
}
/* We couldn't find that proceesor name, or the processor name we
found does not map to an architecture we understand. */
if (p_to_a->arch == aarch64_no_arch
|| a_to_an->arch == aarch64_no_arch)
fatal_error (input_location, "unknown value %qs for -mcpu", name);
std::string outstr = a_to_an->arch_name
+ aarch64_get_extension_string_for_isa_flags (p_to_a->flags)
+ extensions;
/* We are going to memory leak here, nobody elsewhere
in the callchain is going to clean up after us. The alternative is
to allocate a static buffer, and assert that it is big enough for our
modified string, which seems much worse! */
return xstrdup (outstr.c_str ());
}
/* 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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