ffmpeg | branch: master | Lynne <d...@lynne.ee> | Sat Jan 29 03:08:16 2022 +0100| [35080149ef5044694109037f6c6ee176382f357a] | committer: Lynne
x86/tx_float: mark AVX2 functions as AVXSLOW Makes Bulldozer prefer AVX functions rather than AVX2, which are 64% slower: AVX: 117653 decicycles in av_tx (fft), 1048535 runs, 41 skips AVX2: 193385 decicycles in av_tx (fft), 1048561 runs, 15 skips The only difference between both is that vgatherdpd is used in the former. We don't want to mark them with the new SLOW_GATHER flag however, since gathers are still faster on Haswell/Zen 2/3 than plain loads. > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=35080149ef5044694109037f6c6ee176382f357a --- libavutil/x86/tx_float_init.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavutil/x86/tx_float_init.c b/libavutil/x86/tx_float_init.c index 2bc0f4c52c..3a87711def 100644 --- a/libavutil/x86/tx_float_init.c +++ b/libavutil/x86/tx_float_init.c @@ -100,11 +100,11 @@ DECL_CD_DEF(fft_sr_ns_float_avx, FFT, 64, 131072, 2, 0, fft_sr_codelet_init_b8_i #if HAVE_AVX2_EXTERNAL DECL_CD_DEF(fft_sr_float_avx2, FFT, 64, 131072, 2, 0, fft_sr_codelet_init_b8_i2, - 288, AV_CPU_FLAG_AVX2, + 288, AV_CPU_FLAG_AVX2 | AV_CPU_FLAG_AVXSLOW, FF_TX_OUT_OF_PLACE) DECL_CD_DEF(fft_sr_ns_float_avx2, FFT, 64, 131072, 2, 0, fft_sr_codelet_init_b8_i2, - 352, AV_CPU_FLAG_AVX2, + 352, AV_CPU_FLAG_AVX2 | AV_CPU_FLAG_AVXSLOW, FF_TX_OUT_OF_PLACE | AV_TX_INPLACE | FF_TX_PRESHUFFLE) #endif #endif _______________________________________________ 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".
