Change #240052

Comments

avfilter/vf_blackdetect: add AVX2 SIMD version
Requested by a user. Even with autovectorization enabled, the compiler
performs a quite poor job of optimizing this function, due to not being
able to take advantage of the pmaxub + pcmpeqb trick for counting the number
of pixels less than or equal-to a threshold.

blackdetect8_c:                                       4625.0 ( 1.00x)
blackdetect8_avx2:                                     155.1 (29.83x)
blackdetect16_c:                                      2529.4 ( 1.00x)
blackdetect16_avx2:                                    163.6 (15.46x)

Changed files

• libavfilter/vf_blackdetect.c
• libavfilter/vf_blackdetect.h
• libavfilter/x86/Makefile
• libavfilter/x86/vf_blackdetect.asm
• libavfilter/x86/vf_blackdetect_init.c