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# ===========================================================================
# http://autoconf-archive.cryp.to/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
#
# LAST MODIFICATION
#
# 2008-04-12
# 2009-04-23 Mark Asbach <markasbach@users.sourceforge.net<
# Renamed cache variables so they adhere naming convention
# Corrected M4 quoting for AX_CHECK_COMPILER_FLAGS
#
# COPYLEFT
#
# 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.
AC_DEFUN([AX_EXT],
[
AC_REQUIRE([AX_GCC_X86_CPUID])
AX_GCC_X86_CPUID([0x00000001])
if test "$ax_cv_gcc_x86_cpuid_0x00000001" != "unknown"; then
ecx=`echo $ax_cv_gcc_x86_cpuid_0x00000001 | cut -d ":" -f 3`
edx=`echo $ax_cv_gcc_x86_cpuid_0x00000001 | cut -d ":" -f 4`
fi
AC_CACHE_CHECK([whether mmx is supported], [ax_cv_have_mmx_ext],
[
ax_cv_have_mmx_ext=no
if test "$ax_cv_gcc_x86_cpuid_0x00000001" != "unknown"; then
if test "$((0x$edx>>23&0x01))" = 1; then
ax_cv_have_mmx_ext=yes
fi
fi
])
AC_CACHE_CHECK([whether sse is supported], [ax_cv_have_sse_ext],
[
ax_cv_have_sse_ext=no
if test "$ax_cv_gcc_x86_cpuid_0x00000001" != "unknown"; then
if test "$((0x$edx>>25&0x01))" = 1; then
ax_cv_have_sse_ext=yes
fi
fi
])
AC_CACHE_CHECK([whether sse2 is supported], [ax_cv_have_sse2_ext],
[
ax_cv_have_sse2_ext=no
if test "$ax_cv_gcc_x86_cpuid_0x00000001" != "unknown"; then
if test "$((0x$edx>>26&0x01))" = 1; then
ax_cv_have_sse2_ext=yes
fi
fi
])
AC_CACHE_CHECK([whether sse3 is supported], [ax_cv_have_sse3_ext],
[
ax_cv_have_sse3_ext=no
if test "$ax_cv_gcc_x86_cpuid_0x00000001" != "unknown"; then
if test "$((0x$ecx&0x01))" = 1; then
ax_cv_have_sse3_ext=yes
fi
fi
])
AC_CACHE_CHECK([whether ssse3 is supported], [ax_cv_have_ssse3_ext],
[
ax_cv_have_ssse3_ext=no
if test "$ax_cv_gcc_x86_cpuid_0x00000001" != "unknown"; then
if test "$((0x$ecx>>9&0x01))" = 1; then
ax_cv_have_ssse3_ext=yes
fi
fi
])
if test "$ax_cv_have_mmx_ext" = yes; then
AC_DEFINE(HAVE_MMX,,[Support mmx instructions])
AX_CHECK_COMPILER_FLAGS([-mmmx], [SIMD_FLAGS="$SIMD_FLAGS -mmmx"], [])
fi
if test "$ax_cv_have_sse_ext" = yes; then
AC_DEFINE(HAVE_SSE,,[Support SSE (Streaming SIMD Extensions) instructions])
AX_CHECK_COMPILER_FLAGS([-msse], [SIMD_FLAGS="$SIMD_FLAGS -msse"], [])
fi
if test "$ax_cv_have_sse2_ext" = yes; then
AC_DEFINE(HAVE_SSE2,,[Support SSE2 (Streaming SIMD Extensions 2) instructions])
AX_CHECK_COMPILER_FLAGS([-msse2], [SIMD_FLAGS="$SIMD_FLAGS -msse2"], [])
fi
if test "$ax_cv_have_sse3_ext" = yes; then
AC_DEFINE(HAVE_SSE3,,[Support SSE3 (Streaming SIMD Extensions 3) instructions])
AX_CHECK_COMPILER_FLAGS([-msse3], [SIMD_FLAGS="$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])
fi
AC_SUBST(SIMD_FLAGS)
])
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