1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
# ============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpu_supports.html
# ============================================================================
#
# SYNOPSIS
#
# AX_GCC_X86_CPU_SUPPORTS(X86-INSTRUCTION-SET,
# [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
#
# DESCRIPTION
#
# Checks if the host cpu supports X86-INSTRUCTION-SET. The instruction set
# that can be tested are "mmx, popcnt, sse, sse2, sse3, sse4.1, sse4.2,
# sse4a, avx, avx2, avx512f, fma, fma4, bmi, bmi2". If the instruction set
# is supported by the host cpu, the C preprocessor macro
# HAVE_XXX_INSTRUCTIONS is set to 1. The XXX is up-cased instruction case
# with dot replaced by underscore. For example, the test for "sse4.2"
# would export HAVE_SSE4_2_INSTRUCTIONS=1. This macro requires gcc
# extended builtin function "__builtin_cpu_init" and
# "__builtin_cpu_supports" to detect the cpu features. It will error out
# if the compiler doesn't has these builtins.
#
# If the test for the instruction set succeeded, the hook ACTION-IF-FOUND
# would run. Otherwise the hook ACTION-IF-NOT-FOUND would run if
# specified.
#
# See also AX_CHECK_X86_FEATURES, which checks all the possible
# instruction set and export the corresponding CFLAGS.
#
# LICENSE
#
# Copyright (c) 2016 Felix Chern <idryman@gmail.com>
#
# This program 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 2 of the License, or (at your
# option) any later version.
#
# This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 4
AC_DEFUN_ONCE([_AX_GCC_X86_CPU_INIT],
[AC_LANG_PUSH([C])
AC_CACHE_CHECK([for gcc __builtin_cpu_init function],
[ax_cv_gcc_check_x86_cpu_init],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM([#include <stdlib.h>],
[__builtin_cpu_init ();])
],
[ax_cv_gcc_check_x86_cpu_init=yes],
[ax_cv_gcc_check_x86_cpu_init=no])])
AC_LANG_POP([C])
AS_IF([test "X$ax_cv_gcc_check_x86_cpu_init" = "Xno"],
[AC_MSG_ERROR([Need GCC to support X86 CPU features tests])])
])
AC_DEFUN([AX_GCC_X86_CPU_SUPPORTS],
[AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([_AX_GCC_X86_CPU_INIT])
AC_LANG_PUSH([C])
AS_VAR_PUSHDEF([gcc_x86_feature], [AS_TR_SH([ax_cv_gcc_x86_cpu_supports_$1])])
AC_CACHE_CHECK([for x86 $1 instruction support],
[gcc_x86_feature],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM( [#include <stdlib.h> ],
[ __builtin_cpu_init ();
if (__builtin_cpu_supports("$1"))
return 0;
return 1;
])],
[gcc_x86_feature=yes],
[gcc_x86_feature=no]
)]
)
AC_LANG_POP([C])
AS_VAR_IF([gcc_x86_feature],[yes],
[AC_DEFINE(
AS_TR_CPP([HAVE_$1_INSTRUCTIONS]),
[1],
[Define if $1 instructions are supported])
$2],
[$3]
)
AS_VAR_POPDEF([gcc_x86_feature])
])
|
