[FFmpeg-cvslog] avcodec/ppc/h264dsp: Fix left shifts of negative numbers

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Thu Apr  4 02:28:00 2024 +0200| [e54696bcaa0819674e2f9bc7c9a4c87383675091] | committer: Andreas Rheinhardt

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

PPC equivalent of c756b3fca240df75ffa28e75f2eb34834c10294d.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e54696bcaa0819674e2f9bc7c9a4c87383675091
---

 libavcodec/ppc/h264dsp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/ppc/h264dsp.c b/libavcodec/ppc/h264dsp.c
index f50f2553a2..0650768d7b 100644
--- a/libavcodec/ppc/h264dsp.c
+++ b/libavcodec/ppc/h264dsp.c
@@ -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;