Change #264925

Comments

avcodec/x86/vp3dsp: Port ff_put_vp_no_rnd_pixels8_l2_mmx to SSE2
This allows to use pavgb to reduce the amount of instructions used
to calculate the average; processing two rows via movhps allows
to reduce the amount of pxor and pavgb even further and turned
out to be beneficial.
This patch also avoids a load as the constant used here can be easily
generated at runtime.

Old benchmarks:
put_no_rnd_pixels_l2_c:                                 13.3 ( 1.00x)
put_no_rnd_pixels_l2_mmx:                               11.6 ( 1.15x)

New benchmarks:
put_no_rnd_pixels_l2_c:                                 13.4 ( 1.00x)
put_no_rnd_pixels_l2_sse2:                               7.5 ( 1.77x)

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

Changed files

• libavcodec/x86/vp3dsp.asm
• libavcodec/x86/vp3dsp_init.c
• tests/checkasm/vp3dsp.c