105 lines
4.1 KiB
Plaintext
105 lines
4.1 KiB
Plaintext
# ============================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpu_supports.html
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# ============================================================================
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#
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# SYNOPSIS
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#
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# AX_GCC_X86_CPU_SUPPORTS(X86-INSTRUCTION-SET,
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# [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
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#
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# DESCRIPTION
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#
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# Checks if the host cpu supports X86-INSTRUCTION-SET. The instruction set
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# that can be tested are "mmx, popcnt, sse, sse2, sse3, sse4.1, sse4.2,
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# sse4a, avx, avx2, avx512f, fma, fma4, bmi, bmi2". If the instruction set
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# is supported by the host cpu, the C preprocessor macro
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# HAVE_XXX_INSTRUCTIONS is set to 1. The XXX is up-cased instruction case
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# with dot replaced by underscore. For example, the test for "sse4.2"
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# would export HAVE_SSE4_2_INSTRUCTIONS=1. This macro requires gcc
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# extended builtin function "__builtin_cpu_init" and
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# "__builtin_cpu_supports" to detect the cpu features. It will error out
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# if the compiler doesn't has these builtins.
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#
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# If the test for the instruction set succeeded, the hook ACTION-IF-FOUND
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# would run. Otherwise the hook ACTION-IF-NOT-FOUND would run if
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# specified.
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#
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# See also AX_CHECK_X86_FEATURES, which checks all the possible
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# instruction set and export the corresponding CFLAGS.
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#
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# LICENSE
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#
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# Copyright (c) 2016 Felix Chern <idryman@gmail.com>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 3
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AC_DEFUN_ONCE([_AX_GCC_X86_CPU_INIT],
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[AC_LANG_PUSH([C])
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AC_CACHE_CHECK([for gcc __builtin_cpu_init function],
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[ax_cv_gcc_check_x86_cpu_init],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM([#include <stdlib.h>],
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[__builtin_cpu_init ();])
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],
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[ax_cv_gcc_check_x86_cpu_init=yes],
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[ax_cv_gcc_check_x86_cpu_init=no])])
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AS_IF([test "X$ax_cv_gcc_check_x86_cpu_init" = "Xno"],
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[AC_MSG_ERROR([Need GCC to support X86 CPU features tests])])
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])
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AC_DEFUN([AX_GCC_X86_CPU_SUPPORTS],
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[AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([_AX_GCC_X86_CPU_INIT])
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AC_LANG_PUSH([C])
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AS_VAR_PUSHDEF([gcc_x86_feature], [AS_TR_SH([ax_cv_gcc_x86_cpu_supports_$1])])
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AC_CACHE_CHECK([for x86 $1 instruction support],
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[gcc_x86_feature],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM( [#include <stdlib.h> ],
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[ __builtin_cpu_init ();
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if (__builtin_cpu_supports("$1"))
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return 0;
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return 1;
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])],
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[gcc_x86_feature=yes],
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[gcc_x86_feature=no]
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)]
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)
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AC_LANG_POP([C])
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AS_VAR_IF([gcc_x86_feature],[yes],
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[AC_DEFINE(
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AS_TR_CPP([HAVE_$1_INSTRUCTIONS]),
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[1],
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[Define if $1 instructions are supported])
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$2],
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[$3]
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)
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AS_VAR_POPDEF([gcc_x86_feature])
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])
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