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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_MMX / HAVE_SSE / HAVE_SSE2 / HAVE_SSE3 / HAVE_SSSE3 / HAVE_SSE4.1 / HAVE_SSE4.2 / HAVE_AVX
#
# 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.
#serial 12
AC_DEFUN([AX_EXT],
[
AC_REQUIRE([AC_CANONICAL_HOST])
case $host_cpu in
i[[3456]]86*|x86_64*|amd64*)
AC_REQUIRE([AX_GCC_X86_CPUID])
AC_REQUIRE([AX_GCC_X86_AVX_XGETBV])
AX_GCC_X86_CPUID(0x00000001)
ecx=`echo $ax_cv_gcc_x86_cpuid_0x00000001 | cut -d ":" -f 3`
edx=`echo $ax_cv_gcc_x86_cpuid_0x00000001 | cut -d ":" -f 4`
AC_CACHE_CHECK([whether mmx is supported], [ax_cv_have_mmx_ext],
[
ax_cv_have_mmx_ext=no
if test "$((0x$edx>>23&0x01))" = 1; then
ax_cv_have_mmx_ext=yes
fi
])
AC_CACHE_CHECK([whether sse is supported], [ax_cv_have_sse_ext],
[
ax_cv_have_sse_ext=no
if test "$((0x$edx>>25&0x01))" = 1; then
ax_cv_have_sse_ext=yes
fi
])
AC_CACHE_CHECK([whether sse2 is supported], [ax_cv_have_sse2_ext],
[
ax_cv_have_sse2_ext=no
if test "$((0x$edx>>26&0x01))" = 1; then
ax_cv_have_sse2_ext=yes
fi
])
AC_CACHE_CHECK([whether sse3 is supported], [ax_cv_have_sse3_ext],
[
ax_cv_have_sse3_ext=no
if test "$((0x$ecx&0x01))" = 1; then
ax_cv_have_sse3_ext=yes
fi
])
AC_CACHE_CHECK([whether ssse3 is supported], [ax_cv_have_ssse3_ext],
[
ax_cv_have_ssse3_ext=no
if test "$((0x$ecx>>9&0x01))" = 1; then
ax_cv_have_ssse3_ext=yes
fi
])
AC_CACHE_CHECK([whether sse4.1 is supported], [ax_cv_have_sse41_ext],
[
ax_cv_have_sse41_ext=no
if test "$((0x$ecx>>19&0x01))" = 1; then
ax_cv_have_sse41_ext=yes
fi
])
AC_CACHE_CHECK([whether sse4.2 is supported], [ax_cv_have_sse42_ext],
[
ax_cv_have_sse42_ext=no
if test "$((0x$ecx>>20&0x01))" = 1; then
ax_cv_have_sse42_ext=yes
fi
])
AC_CACHE_CHECK([whether avx is supported by processor], [ax_cv_have_avx_cpu_ext],
[
ax_cv_have_avx_cpu_ext=no
if test "$((0x$ecx>>28&0x01))" = 1; then
ax_cv_have_avx_cpu_ext=yes
fi
])
if test x"$ax_cv_have_avx_cpu_ext" = x"yes"; then
AX_GCC_X86_AVX_XGETBV(0x00000000)
xgetbv_eax="0"
if test x"$ax_cv_gcc_x86_avx_xgetbv_0x00000000" != x"unknown"; then
xgetbv_eax=`echo $ax_cv_gcc_x86_avx_xgetbv_0x00000000 | cut -d ":" -f 1`
fi
AC_CACHE_CHECK([whether avx is supported by operating system], [ax_cv_have_avx_ext],
[
ax_cv_have_avx_ext=no
if test "$((0x$ecx>>27&0x01))" = 1; then
if test "$((0x$xgetbv_eax&0x6))" = 6; then
ax_cv_have_avx_ext=yes
fi
fi
])
if test x"$ax_cv_have_avx_ext" = x"no"; then
AC_MSG_WARN([Your processor supports AVX, but your operating system doesn't])
fi
fi
if test "$ax_cv_have_mmx_ext" = yes; then
AX_CHECK_COMPILE_FLAG(-mmmx, ax_cv_support_mmx_ext=yes, [])
if test x"$ax_cv_support_mmx_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -mmmx"
AC_DEFINE(HAVE_MMX,,[Support mmx instructions])
else
AC_MSG_WARN([Your processor supports mmx instructions but not your compiler, can you try another compiler?])
fi
fi
if test "$ax_cv_have_sse_ext" = yes; then
AX_CHECK_COMPILE_FLAG(-msse, ax_cv_support_sse_ext=yes, [])
if test x"$ax_cv_support_sse_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -msse"
AC_DEFINE(HAVE_SSE,,[Support SSE (Streaming SIMD Extensions) instructions])
else
AC_MSG_WARN([Your processor supports sse instructions but not your compiler, can you try another compiler?])
fi
fi
if test "$ax_cv_have_sse2_ext" = yes; then
AX_CHECK_COMPILE_FLAG(-msse2, ax_cv_support_sse2_ext=yes, [])
if test x"$ax_cv_support_sse2_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -msse2"
AC_DEFINE(HAVE_SSE2,,[Support SSE2 (Streaming SIMD Extensions 2) instructions])
else
AC_MSG_WARN([Your processor supports sse2 instructions but not your compiler, can you try another compiler?])
fi
fi
if test "$ax_cv_have_sse3_ext" = yes; then
AX_CHECK_COMPILE_FLAG(-msse3, ax_cv_support_sse3_ext=yes, [])
if test x"$ax_cv_support_sse3_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -msse3"
AC_DEFINE(HAVE_SSE3,,[Support SSE3 (Streaming SIMD Extensions 3) instructions])
else
AC_MSG_WARN([Your processor supports sse3 instructions but not your compiler, can you try another compiler?])
fi
fi
if test "$ax_cv_have_ssse3_ext" = yes; then
AX_CHECK_COMPILE_FLAG(-mssse3, ax_cv_support_ssse3_ext=yes, [])
if test x"$ax_cv_support_ssse3_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -mssse3"
AC_DEFINE(HAVE_SSSE3,,[Support SSSE3 (Supplemental Streaming SIMD Extensions 3) instructions])
else
AC_MSG_WARN([Your processor supports ssse3 instructions but not your compiler, can you try another compiler?])
fi
fi
if test "$ax_cv_have_sse41_ext" = yes; then
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 SSSE4.1 (Streaming SIMD Extensions 4.1) instructions])
else
AC_MSG_WARN([Your processor supports sse4.1 instructions but not your compiler, can you try another compiler?])
fi
fi
if test "$ax_cv_have_sse42_ext" = yes; then
AX_CHECK_COMPILE_FLAG(-msse4.2, ax_cv_support_sse42_ext=yes, [])
if test x"$ax_cv_support_sse42_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -msse4.2"
AC_DEFINE(HAVE_SSE4_2,,[Support SSSE4.2 (Streaming SIMD Extensions 4.2) instructions])
else
AC_MSG_WARN([Your processor supports sse4.2 instructions but not your compiler, can you try another compiler?])
fi
fi
if test "$ax_cv_have_avx_ext" = yes; then
AX_CHECK_COMPILE_FLAG(-mavx, ax_cv_support_avx_ext=yes, [])
if test x"$ax_cv_support_avx_ext" = x"yes"; then
SIMD_FLAGS="$SIMD_FLAGS -mavx"
AC_DEFINE(HAVE_AVX,,[Support AVX (Advanced Vector Extensions) instructions])
else
AC_MSG_WARN([Your processor supports avx instructions but not your compiler, can you try another compiler?])
fi
fi
;;
esac
AC_SUBST(SIMD_FLAGS)
])
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