On Thu, Aug 04, 2022 at 10:47:34AM +0300, Martin Storsjö wrote:
> On Wed, 13 Jul 2022, Martin Storsjö wrote:
>
> > The height is hardcoded in some of the me_cmp functions, but not
> > in all of them. But in the case of all other functions, it's hardcoded
> > in the same place in SIMD functions as in the C reference functions,
> > while this one function differs from the behaviour of the C code.
> >
> > (Before 542765ce3eccbca587d54262a512cbdb1407230d, there were a
> > couple other sad8_*_mmx functions with similar hardcoded height.)
> > ---
> > libavcodec/x86/me_cmp_init.c | 3 +--
> > 1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/libavcodec/x86/me_cmp_init.c b/libavcodec/x86/me_cmp_init.c
> > index 61e9396b8f..dcc2621276 100644
> > --- a/libavcodec/x86/me_cmp_init.c
> > +++ b/libavcodec/x86/me_cmp_init.c
> > @@ -202,13 +202,12 @@ static inline int sum_mmx(void)
> > static int sad8_xy2_ ## suf(MpegEncContext *v, uint8_t *blk2, \
> > uint8_t *blk1, ptrdiff_t stride, int h) \
> > { \
> > - av_assert2(h == 8);
> > \
> > __asm__ volatile ( \
> > "pxor %%mm7, %%mm7 \n\t" \
> > "pxor %%mm6, %%mm6 \n\t" \
> > ::); \
> > \
> > - sad8_4_ ## suf(blk1, blk2, stride, 8); \
> > + sad8_4_ ## suf(blk1, blk2, stride, h); \
> > \
> > return sum_ ## suf(); \
> > } \
> > --
> > 2.25.1
>
> Ping, does this seem reasonable? Michael indicated a desire to make the
> me_cmp functions more general and flexible than what they are today, and
> this would be a first step to making checkasm test such cases.LGTM assuming it doesnt have any problematic perforamce impact thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Frequently ignored answer#1 FFmpeg bugs should be sent to our bugtracker. User questions about the command line tools should be sent to the ffmpeg-user ML. And questions about how to use libav* should be sent to the libav-user ML.
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