Also disable the mmx/iwht optimization when the bitexact flag is set.
With synthetically coded coefficients (i.e. these that lead to a
residual well outside the [-255,255] range), our optimizations will
overflow. It doesn't make sense to fix the overflows, since they can
only occur on synthetic input, not on real fwht-generated input. Thus,
add a bitexact flag that disables this optimization.
This patch adds MSA (MIPS-SIMD-Arch) optimizations for VP9 MC functions in new file vp9_mc_msa.c
Signed-off-by: Shivraj Patil <shivraj.patil@imgtec.com>
Reviewed-by: "Ronald S. Bultje" <rsbultje@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
The directional intra predictors either don't care about order (dc, h,
dc_left, tm), or they prefer inverted order (vr, dr, hd). This allows
more efficient SIMD implementations.
before:
./ffmpeg -v 0 -nostats -i ~/samples/vp9/etv.webm -f null - 16.29s user 0.02s system 99% cpu 16.323 total
./ffmpeg -v 0 -nostats -i ~/samples/vp9/etv.webm -f null - 16.32s user 0.01s system 99% cpu 16.351 total
./ffmpeg -v 0 -nostats -i ~/samples/vp9/etv.webm -f null - 16.27s user 0.05s system 99% cpu 16.335 total
after:
./ffmpeg -v 0 -nostats -i ~/samples/vp9/etv.webm -f null - 15.22s user 0.03s system 99% cpu 15.257 total
./ffmpeg -v 0 -nostats -i ~/samples/vp9/etv.webm -f null - 15.20s user 0.02s system 99% cpu 15.237 total
./ffmpeg -v 0 -nostats -i ~/samples/vp9/etv.webm -f null - 15.19s user 0.02s system 99% cpu 15.227 total
The memset following the memcpy was silencing the problem since
re-writing that same byte.
Fixes CID1108597, CID1108598, (16x16)
CID1108599, CID1108600, (8x8)
CID1108601, CID1108602 (32x32)
Signed-off-by: Clément Bœsch <u@pkh.me>
