ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinha...@outlook.com> | Fri Mar 29 01:10:10 2024 +0100| [356610a2ac1db9c1908903ee48721b3ce391ba01] | committer: Andreas Rheinhardt
avcodec/ppc/hpeldsp_altivec: Fix left-shift of negative number It is UB and affected e.g. the vp5 and vp61 FATE tests: https://fate.ffmpeg.org/report.cgi?time=20240327083327&slot=ppc-linux-gcc-13.2-ubsan-altivec-qemu Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=356610a2ac1db9c1908903ee48721b3ce391ba01 --- libavcodec/ppc/hpeldsp_altivec.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavcodec/ppc/hpeldsp_altivec.c b/libavcodec/ppc/hpeldsp_altivec.c index a531b6b6ec..4bf6b28ed6 100644 --- a/libavcodec/ppc/hpeldsp_altivec.c +++ b/libavcodec/ppc/hpeldsp_altivec.c @@ -41,9 +41,9 @@ void ff_put_pixels16_altivec(uint8_t *block, const uint8_t *pixels, ptrdiff_t li register vector unsigned char pixelsv1D; int i; - register ptrdiff_t line_size_2 = line_size << 1; + register ptrdiff_t line_size_2 = line_size * (1 << 1); register ptrdiff_t line_size_3 = line_size + line_size_2; - register ptrdiff_t line_size_4 = line_size << 2; + register ptrdiff_t line_size_4 = line_size * (1 << 2); // hand-unrolling the loop by 4 gains about 15% // mininum execution time goes from 74 to 60 cycles _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
