![AndersBroman](/assets/img/avatar_default.png)
Change-Id: I63ecfde72f33350d15c430da71fa11ac4923a121 Reviewed-on: https://code.wireshark.org/review/2109 Reviewed-by: Anders Broman <a.broman58@gmail.com>
81 lines
3.3 KiB
Text
81 lines
3.3 KiB
Text
# ===========================================================================
|
|
# http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_avx_xgetbv.html
|
|
# ===========================================================================
|
|
#
|
|
# SYNOPSIS
|
|
#
|
|
# AX_GCC_X86_AVX_XGETBV
|
|
#
|
|
# DESCRIPTION
|
|
#
|
|
# On later x86 processors with AVX SIMD support, with gcc or a compiler
|
|
# that has a compatible syntax for inline assembly instructions, run a
|
|
# small program that executes the xgetbv instruction with input OP. This
|
|
# can be used to detect if the OS supports AVX instruction usage.
|
|
#
|
|
# On output, the values of the eax and edx registers are stored as
|
|
# hexadecimal strings as "eax:edx" in the cache variable
|
|
# ax_cv_gcc_x86_avx_xgetbv.
|
|
#
|
|
# If the xgetbv instruction fails (because you are running a
|
|
# cross-compiler, or because you are not using gcc, or because you are on
|
|
# a processor that doesn't have this instruction),
|
|
# ax_cv_gcc_x86_avx_xgetbv_OP is set to the string "unknown".
|
|
#
|
|
# This macro mainly exists to be used in AX_EXT.
|
|
#
|
|
# LICENSE
|
|
#
|
|
# Copyright (c) 2013 Michael Petch <mpetch@capp-sysware.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 3 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 <http://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 1
|
|
|
|
AC_DEFUN([AX_GCC_X86_AVX_XGETBV],
|
|
[AC_REQUIRE([AC_PROG_CC])
|
|
AC_LANG_PUSH([C])
|
|
AC_CACHE_CHECK(for x86-AVX xgetbv $1 output, ax_cv_gcc_x86_avx_xgetbv_$1,
|
|
[AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [
|
|
int op = $1, eax, edx;
|
|
FILE *f;
|
|
/* Opcodes for xgetbv */
|
|
__asm__(".byte 0x0f, 0x01, 0xd0"
|
|
: "=a" (eax), "=d" (edx)
|
|
: "c" (op));
|
|
f = fopen("conftest_xgetbv", "w"); if (!f) return 1;
|
|
fprintf(f, "%x:%x\n", eax, edx);
|
|
fclose(f);
|
|
return 0;
|
|
])],
|
|
[ax_cv_gcc_x86_avx_xgetbv_$1=`cat conftest_xgetbv`; rm -f conftest_xgetbv],
|
|
[ax_cv_gcc_x86_avx_xgetbv_$1=unknown; rm -f conftest_xgetbv],
|
|
[ax_cv_gcc_x86_avx_xgetbv_$1=unknown])])
|
|
AC_LANG_POP([C])
|
|
])
|
|
|