[Ffmpeg-cvslog] r7898 - trunk/libavcodec/i386/dsputil_h264_template_mmx.c

[michael]

Author: michael
Date: Fri Feb  9 13:37:38 2007
New Revision: 7898

Modified:
   trunk/libavcodec/i386/dsputil_h264_template_mmx.c

Log:
factor out common subexprssion (gcc of course is too stupid to do this ...)
5% faster avg_h264_chroma_mc2_mmx2()
10% faster put_h264_chroma_mc2_mmx2()


Modified: trunk/libavcodec/i386/dsputil_h264_template_mmx.c
==============================================================================
--- trunk/libavcodec/i386/dsputil_h264_template_mmx.c	(original)
+++ trunk/libavcodec/i386/dsputil_h264_template_mmx.c	Fri Feb  9 13:37:38 2007
@@ -265,8 +265,9 @@
 #ifdef H264_CHROMA_MC2_TMPL
 static void H264_CHROMA_MC2_TMPL(uint8_t *dst/*align 2*/, uint8_t *src/*align 1*/, int stride, int h, int x, int y)
 {
-    int CD=((1<<16)-1)*x*y + 8*y;
-    int AB=((8<<16)-8)*x + 64 - CD;
+    int tmp = ((1<<16)-1)*x + 8;
+    int CD= tmp*y;
+    int AB= (tmp<<3) - CD;
     asm volatile(
         /* mm5 = {A,B,A,B} */
         /* mm6 = {C,D,C,D} */