[FFmpeg-cvslog] r16449 - trunk/libavcodec/ppc/h264_altivec.c

[gpoirier]

Author: gpoirier
Date: Tue Jan  6 11:35:06 2009
New Revision: 16449

Log:
offset and weights are signed, fixes some non-bitexact issues.
Patch by David Conrad %lessen42 A gmail P com%

Modified:
   trunk/libavcodec/ppc/h264_altivec.c

Modified: trunk/libavcodec/ppc/h264_altivec.c
==============================================================================
--- trunk/libavcodec/ppc/h264_altivec.c	Tue Jan  6 11:13:25 2009	(r16448)
+++ trunk/libavcodec/ppc/h264_altivec.c	Tue Jan  6 11:35:06 2009	(r16449)
@@ -942,7 +942,8 @@ void biweight_h264_WxH_altivec(uint8_t *
 {
     int y, dst_aligned, src_aligned;
     vec_u8 vsrc, vdst;
-    vec_u16 vtemp, vlog2_denom, vweights, vweightd, voffset, v0, v1, v2, v3;
+    vec_s16 vtemp, vweights, vweightd, voffset, v0, v1, v2, v3;
+    vec_u16 vlog2_denom;
     DECLARE_ALIGNED_16(int32_t, temp[4]);
     LOAD_ZERO;
 
@@ -977,16 +978,16 @@ void biweight_h264_WxH_altivec(uint8_t *
         }
 
         if (w == 16 || dst_aligned) {
-            v0 = vec_mladd(v0, vweightd, zero_u16v);
-            v2 = vec_mladd(v2, vweights, zero_u16v);
+            v0 = vec_mladd(v0, vweightd, zero_s16v);
+            v2 = vec_mladd(v2, vweights, zero_s16v);
 
             v0 = vec_adds(v0, voffset);
             v0 = vec_adds(v0, v2);
             v0 = vec_sra(v0, vlog2_denom);
         }
         if (w == 16 || !dst_aligned) {
-            v1 = vec_mladd(v1, vweightd, zero_u16v);
-            v3 = vec_mladd(v3, vweights, zero_u16v);
+            v1 = vec_mladd(v1, vweightd, zero_s16v);
+            v3 = vec_mladd(v3, vweights, zero_s16v);
 
             v1 = vec_adds(v1, voffset);
             v1 = vec_adds(v1, v3);