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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_ext.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_EXT
#
# DESCRIPTION
#
# Find supported SIMD extensions by requesting cpuid. When an SIMD
# extension is found, the -m"simdextensionname" is added to SIMD_FLAGS if
# compiler supports it. For example, if "sse2" is available, then "-msse2"
# is added to SIMD_FLAGS.
#
# This macro calls:
#
# AC_SUBST(SIMD_FLAGS)
#
# And defines:
#
# HAVE_AVX3 / HAVE_SSSE3 / HAVE_SSE4.1
#
# LICENSE
#
# Copyright (c) 2007 Christophe Tournayre <turn3r@users.sourceforge.net>
# Copyright (c) 2013 Michael Petch <mpetch@capp-sysware.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#
# NOTE: The functionality that requests the cpuid has been stripped because
# this project detects the CPU capabilities during runtime. However, we
# still need to check if the compiler supports the requested SIMD flag.
#serial 12
AC_DEFUN([AX_CHECK_SIMD],
[
AC_REQUIRE([AC_CANONICAL_HOST])
AM_CONDITIONAL(HAVE_AVX2, false)
AM_CONDITIONAL(HAVE_SSSE3, false)
AM_CONDITIONAL(HAVE_SSE4_1, false)
case $host_cpu in
i[[3456]]86*|x86_64*|amd64*)
AX_CHECK_COMPILE_FLAG(-mavx2, ax_cv_support_avx2_ext=yes, [])
if test x"$ax_cv_support_avx2_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -mavx2"
AC_DEFINE(HAVE_AVX2,,
[Support AVX2 (Advanced Vector Extensions 2) instructions])
AM_CONDITIONAL(HAVE_AVX2, true)
else
AC_MSG_WARN([Your compiler does not support AVX2 instructions])
fi
AX_CHECK_COMPILE_FLAG(-mssse3, ax_cv_support_ssse3_ext=yes, [])
if test x"$ax_cv_support_ssse3_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -mssse3"
AC_DEFINE(HAVE_SSSE3,,
[Support SSSE3 (Supplemental Streaming SIMD Extensions 3) instructions])
AM_CONDITIONAL(HAVE_SSSE3, true)
else
AC_MSG_WARN([Your compiler does not support SSSE3 instructions])
fi
AX_CHECK_COMPILE_FLAG(-msse4.1, ax_cv_support_sse41_ext=yes, [])
if test x"$ax_cv_support_sse41_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -msse4.1"
AC_DEFINE(HAVE_SSE4_1,,
[Support SSE4.1 (Streaming SIMD Extensions 4.1) instructions])
AM_CONDITIONAL(HAVE_SSE4_1, true)
else
AC_MSG_WARN([Your compiler does not support SSE4.1 instructions])
fi
;;
esac
AC_SUBST(SIMD_FLAGS)
])
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