fix compilation of 3dnowext instinsincs, both on ia32 and AMD64.

3dnow intrinsincs are for now only compiled if 3dnowext support is available. (I should add smth that
checks for plain 3dnow later)

Originally committed as revision 5386 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 7 insertions, 1 deletions

diff --git a/configure b/configure
index ea24e7dae6..f491f2aaa7 100755
--- a/configure
+++ b/configure
@@ -1114,13 +1114,19 @@ fi
 cat > $TMPC << EOF
 #include <mm3dnow.h>
 int main(void) {
+__m64 b1;
+b1 = _m_pswapd(b1);
 _m_femms();
 return 0;
 }
 EOF
 
 mm3dnow=no
-if $cc -m3dnow -o $TMPO $TMPC 2> /dev/null ; then
+march=athlon
+if test "$cpu" = "x86_64"; then
+  march=k8
+fi
+if $cc -march=$march -o $TMPO $TMPC 2> /dev/null ; then
   mm3dnow=yes
 fi