mirror of https://gerrit.osmocom.org/libosmocore
configure.ac: add SIMD detection capabilities
This change adds a check whether compiler supports some SIMD (Single Instruction, Multiple Data) instructions. It is enabled by default, and can be disabled by configure option --disable-simd. The check macro is based on the AX_EXT from autoconf-archive: www.gnu.org/software/autoconf-archive/ax_ext.html And depends on the ax_check_compile_flag macro: www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html Currently only the following SIMD extensions are being checked: AVX2, SSE3, SSE4.1, but adding others is also possible. All found extensions are being defined in the 'config.h' header. Change-Id: Idf8fff984bd936a75c7c307338df88ba4b005817changes/53/2453/6
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2c3066e5da
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@ -12,6 +12,7 @@ aclocal.m4
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acinclude.m4
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aminclude.am
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m4/*.m4
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!m4/ax_*.m4
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autom4te.cache
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config.cache
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config.h*
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16
configure.ac
16
configure.ac
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@ -226,6 +226,22 @@ then
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CPPFLAGS+=" -fsanitize=address -fsanitize=undefined"
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fi
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AC_ARG_ENABLE(simd,
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[AS_HELP_STRING(
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[--disable-simd],
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[Disable SIMD support]
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)],
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[simd=$enableval], [simd="yes"])
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if test x"$simd" = x"yes"
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then
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# Find and define supported SIMD extensions
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AX_CHECK_SIMD
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else
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AM_CONDITIONAL(HAVE_AVX2, false)
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AM_CONDITIONAL(HAVE_SSE3, false)
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AM_CONDITIONAL(HAVE_SSE4_1, false)
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fi
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AC_OUTPUT(
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libosmocore.pc
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libosmocodec.pc
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@ -0,0 +1,74 @@
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
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#
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# DESCRIPTION
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#
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# Check whether the given FLAG works with the current language's compiler
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# or gives an error. (Warnings, however, are ignored)
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#
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# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
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# success/failure.
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#
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# If EXTRA-FLAGS is defined, it is added to the current language's default
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# flags (e.g. CFLAGS) when the check is done. The check is thus made with
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# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
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# force the compiler to issue an error when a bad flag is given.
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#
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# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
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#
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# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
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# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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# Copyright (c) 2011 Maarten Bosmans <mkbosmans@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 3 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 5
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AC_DEFUN([AX_CHECK_COMPILE_FLAG],
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[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
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AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
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AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
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ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
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_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
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AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
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[AS_VAR_SET(CACHEVAR,[yes])],
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[AS_VAR_SET(CACHEVAR,[no])])
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_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
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AS_VAR_IF(CACHEVAR,yes,
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[m4_default([$2], :)],
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[m4_default([$3], :)])
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AS_VAR_POPDEF([CACHEVAR])dnl
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])dnl AX_CHECK_COMPILE_FLAGS
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@ -0,0 +1,82 @@
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_ext.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_EXT
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#
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# DESCRIPTION
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#
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# Find supported SIMD extensions by requesting cpuid. When an SIMD
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# extension is found, the -m"simdextensionname" is added to SIMD_FLAGS if
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# compiler supports it. For example, if "sse2" is available, then "-msse2"
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# is added to SIMD_FLAGS.
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#
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# This macro calls:
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#
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# AC_SUBST(SIMD_FLAGS)
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#
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# And defines:
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#
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# HAVE_AVX3 / HAVE_SSE3 / HAVE_SSE4.1
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#
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# LICENSE
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#
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# Copyright (c) 2007 Christophe Tournayre <turn3r@users.sourceforge.net>
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# Copyright (c) 2013 Michael Petch <mpetch@capp-sysware.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#
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# NOTE: The functionality that requests the cpuid has been stripped because
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# this project detects the CPU capabilities during runtime. However, we
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# still need to check if the compiler supports the requested SIMD flag.
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#serial 12
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AC_DEFUN([AX_CHECK_SIMD],
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[
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AC_REQUIRE([AC_CANONICAL_HOST])
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case $host_cpu in
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i[[3456]]86*|x86_64*|amd64*)
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AX_CHECK_COMPILE_FLAG(-mavx2, ax_cv_support_avx2_ext=yes, [])
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if test x"$ax_cv_support_avx2_ext" = x"yes"; then
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SIMD_FLAGS="$SIMD_FLAGS -mavx2"
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AC_DEFINE(HAVE_AVX2,,
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[Support AVX2 (Advanced Vector Extensions 2) instructions])
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AM_CONDITIONAL(HAVE_AVX2, true)
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else
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AC_MSG_WARN([Your compiler does not support AVX2 instructions])
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AM_CONDITIONAL(HAVE_AVX2, false)
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fi
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AX_CHECK_COMPILE_FLAG(-msse3, ax_cv_support_sse3_ext=yes, [])
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if test x"$ax_cv_support_sse3_ext" = x"yes"; then
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SIMD_FLAGS="$SIMD_FLAGS -msse3"
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AC_DEFINE(HAVE_SSE3,,
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[Support SSE3 (Streaming SIMD Extensions 3) instructions])
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AM_CONDITIONAL(HAVE_SSE3, true)
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else
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AC_MSG_WARN([Your compiler does not support SSE3 instructions])
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AM_CONDITIONAL(HAVE_SSE3, false)
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fi
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AX_CHECK_COMPILE_FLAG(-msse4.1, ax_cv_support_sse41_ext=yes, [])
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if test x"$ax_cv_support_sse41_ext" = x"yes"; then
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SIMD_FLAGS="$SIMD_FLAGS -msse4.1"
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AC_DEFINE(HAVE_SSE4_1,,
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[Support SSE4.1 (Streaming SIMD Extensions 4.1) instructions])
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AM_CONDITIONAL(HAVE_SSE4_1, true)
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else
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AC_MSG_WARN([Your compiler does not support SSE4.1 instructions])
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AM_CONDITIONAL(HAVE_SSE4_1, false)
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fi
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;;
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esac
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AC_SUBST(SIMD_FLAGS)
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])
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