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avcodec/ppc/h264dsp: Fix left shifts of negative numbers

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PPC equivalent of c756b3fca240df75ffa28e75f2eb34834c10294d.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
(cherry picked from commit e54696bcaa0819674e2f9bc7c9a4c87383675091)
This commit is contained in:
Andreas Rheinhardt 2024-04-04 02:28:00 +02:00
parent 083443d67c
commit 0e3a46720a
1 changed files with 2 additions and 2 deletions
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4
libavcodec/ppc/h264dsp.c
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@ -663,7 +663,7 @@ void weight_h264_W_altivec(uint8_t *block, int stride, int height,
DECLARE_ALIGNED(16, int32_t, temp)[4];
LOAD_ZERO;
offset <<= log2_denom;
offset *= 1 << log2_denom;
if(log2_denom) offset += 1<<(log2_denom-1);
temp[0] = log2_denom;
temp[1] = weight;
@ -712,7 +712,7 @@ void biweight_h264_W_altivec(uint8_t *dst, uint8_t *src, int stride, int height,
DECLARE_ALIGNED(16, int32_t, temp)[4];
LOAD_ZERO;
offset = ((offset + 1) | 1) << log2_denom;
offset = ((offset + 1) | 1) * (1 << log2_denom);
temp[0] = log2_denom+1;
temp[1] = weights;
temp[2] = weightd;