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offset and weights are signed, fixes some non-bitexact issues.

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Patch by David Conrad %lessen42 A gmail P com%

Originally committed as revision 16449 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2009-01-06 10:35:06 +00:00 committed by Guillaume Poirier
parent 373745ae62
commit 54b9095833
1 changed files with 6 additions and 5 deletions
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11
libavcodec/ppc/h264_altivec.c
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@ -942,7 +942,8 @@ void biweight_h264_WxH_altivec(uint8_t *dst, uint8_t *src, int stride, int log2_
{
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 *dst, uint8_t *src, int stride, int log2_
}
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);