* oooooops - sorry for this one - wrong logic

  empty dsp_mask - no change
  FORCE - add,  no FORCE - enabled bits are masked out


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@1659 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/i386/dsputil_mmx.c

@@ -1441,10 +1441,12 @@ void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx)
 {
     mm_flags = mm_support();
 
-    if (avctx->dsp_mask && FF_MM_FORCE)
+    if (avctx->dsp_mask) {
+	if (avctx->dsp_mask & FF_MM_FORCE)
 	    mm_flags |= (avctx->dsp_mask & 0xffff);
 	else
-        mm_flags &= (avctx->dsp_mask & 0xffff);
+	    mm_flags &= ~(avctx->dsp_mask & 0xffff);
+    }
 
 #if 0
     fprintf(stderr, "libavcodec: CPU flags:");