--- /dev/null
+# ===========================================================================
+# 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$edx>>25&0x01))" = 1; then
+ ax_cv_have_sse_ext=yes
+ fi
+ fi
+ ])
+
+ AC_CACHE_CHECK([whether sse2 is supported], [ax_cv_have_sse2_ext],
+ [
+ ax_cv_have_sse2_ext=no
+ if test "$((0x$edx>>26&0x01))" = 1; then
+ ax_cv_have_sse2_ext=yes
+ fi
+ ])
+
+ AC_CACHE_CHECK([whether sse3 is supported], [ax_cv_have_sse3_ext],
+ [
+ ax_cv_have_sse3_ext=no
+ if test "$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)
+])