[FFmpeg-cvslog] r21463 - trunk/libavcodec/mathops.h

[mru]

Author: mru
Date: Tue Jan 26 19:05:55 2010
New Revision: 21463

Log:
Add UMULH()

This function/macro returns the high half of the unsigned 64-bit
product of two unsigned 32-bit operands.

Modified:
   trunk/libavcodec/mathops.h

Modified: trunk/libavcodec/mathops.h
==============================================================================
--- trunk/libavcodec/mathops.h	Tue Jan 26 18:17:48 2010	(r21462)
+++ trunk/libavcodec/mathops.h	Tue Jan 26 19:05:55 2010	(r21463)
@@ -53,6 +53,12 @@ static av_always_inline int MULH(int a, 
 }
 #endif
 
+#ifndef UMULH
+static av_always_inline unsigned UMULH(unsigned a, unsigned b){
+    return ((uint64_t)(a) * (uint64_t)(b))>>32;
+}
+#endif
+
 #ifndef MUL64
 #   define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
 #endif