m4 marcros

svn path=/trunk/externals/zexy/; revision=15370

1 files changed, 38 insertions, 0 deletions

diff --git a/m4/iem_simd.m4 b/m4/iem_simd.m4
new file mode 100644
index 0000000..7f89558
--- /dev/null
+++ b/m4/iem_simd.m4
@@ -0,0 +1,38 @@
+dnl Copyright (C) 2005-2006 IOhannes m zmölnig
+dnl This file is free software; IOhannes m zmölnig
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+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