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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
# (only if compilator support it) (ie : if "sse2" is available "-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_SSE41 / HAVE_SSE42 / HAVE_AVX
#
# LICENSE
#
# Copyright (c) 2008 Christophe Tournayre <turn3r@users.sourceforge.net>
#
# 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 9
AC_DEFUN([AX_EXT],
[
AC_REQUIRE([AX_GCC_X86_CPUID])
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$ecx>>20&0x01))" = 1; then
ax_cv_have_sse42_ext=yes
fi
])
AC_CACHE_CHECK([whether avx is supported], [ax_cv_have_avx_ext],
[
ax_cv_have_avx_ext=no
if test "$((0x$ecx>>28&0x01))" = 1; then
ax_cv_have_avx_ext=yes
fi
])
if test "$ax_cv_have_mmx_ext" = yes; then
AC_DEFINE(HAVE_MMX,, [Support MMX instructions])
AX_CHECK_COMPILE_FLAG(-mmmx, SIMD_FLAGS="$SIMD_FLAGS -mmmx", [])
fi
if test "$ax_cv_have_sse_ext" = yes; then
AC_DEFINE(HAVE_SSE,, [Support SSE (Streaming SIMD Extensions) instructions])
AX_CHECK_COMPILE_FLAG(-msse, SIMD_FLAGS="$SIMD_FLAGS -msse", [])
fi
if test "$ax_cv_have_sse2_ext" = yes; then
AC_DEFINE(HAVE_SSE2,, [Support SSE2 (Streaming SIMD Extensions 2) instructions])
AX_CHECK_COMPILE_FLAG(-msse2, SIMD_FLAGS="$SIMD_FLAGS -msse2", [])
fi
if test "$ax_cv_have_sse3_ext" = yes; then
AC_DEFINE(HAVE_SSE3,, [Support SSE3 (Streaming SIMD Extensions 3) instructions])
AX_CHECK_COMPILE_FLAG(-msse3, SIMD_FLAGS="$SIMD_FLAGS -msse3", [])
fi
if test "$ax_cv_have_ssse3_ext" = yes; then
AC_DEFINE(HAVE_SSSE3,, [Support SSSE3 (Supplemental Streaming SIMD Extensions 3) instructions])
AX_CHECK_COMPILE_FLAG(-mssse3, SIMD_FLAGS="$SIMD_FLAGS -mssse3", [])
fi
if test "$ax_cv_have_sse41_ext" = yes; then
AC_DEFINE(HAVE_SSE41,, [Support SSE4.1 (Streaming SIMD Extensions 4.1) instructions])
AX_CHECK_COMPILE_FLAG(-msse4.1, SIMD_FLAGS="$SIMD_FLAGS -msse4.1", [])
fi
if test "$ax_cv_have_sse42_ext" = yes; then
AC_DEFINE(HAVE_SSE42, 1,[Support SSE4.2 (Streaming SIMD Extensions 4.2) instructions])
AX_CHECK_COMPILE_FLAG(-msse4.2, SIMD_FLAGS="$SIMD_FLAGS -msse4.2", [])
fi
if test "$ax_cv_have_avx_ext" = yes; then
AC_DEFINE(HAVE_AVX,,[Support AVX (Advanced Vector Extensions) instructions])
AX_CHECK_COMPILE_FLAG(-mavx, SIMD_FLAGS="$SIMD_FLAGS -mavx", [])
fi
AC_SUBST(SIMD_FLAGS)
])
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