1 files changed, 34 insertions, 0 deletions
diff --git a/src/acinclude.m4 b/src/acinclude.m4
index daf0c11..7922bc8 100644
--- a/src/acinclude.m4
+++ b/src/acinclude.m4
@@ -160,3 +160,37 @@ if test "$fat_binary" != no; then
    undefine([Name])
 fi
 ])# AC_CHECK_FAT
+
+AC_DEFUN([AC_CHECK_SIMD],
+[
+AC_ARG_ENABLE(simd,
+       [  --enable-simd=ARCHS
+                          enable SIMD optimization;
+                          valid arguments are: SSE2
+       ],
+       [simd=$enableval], [simd=no])
+if test "$simd" != no; then
+   AC_MSG_CHECKING([SIMD optimization])
+
+   # Respect SIMD given to --enable-simd if present.
+   if test "$simd" != yes; then
+	    SIMD=`echo "$simd" | tr ',' ' '`
+   else
+	    # Choose a default set of architectures based upon platform.
+      SIMD="SSE2"
+   fi
+   AC_MSG_RESULT([$SIMD])
+
+   for smd in $SIMD 
+   do
+    case "${smd}" in
+    SSE2|sse2)
+      AC_CHECK_CFLAGS([-mfpmath=sse -msse])
+    ;;
+    *)
+      AC_MSG_RESULT([unknown SIMD instructions: ${smd}])
+    ;;
+    esac
+   done
+fi
+])# AC_CHECK_SIMD