Le torstaina 22. toukokuuta 2025, 9.32.18 Itä-Euroopan kesäaika Jiawei a écrit : > > The RISC-V autovectorised output looks like it has a warning "Odd > > rotation angle" which is not present in the non-autovectorised output. > > I found this occured when using '-ffast-math' in RISC-V, also occur in > -O3 -ffast-math -fno-tree-vectorize case(much slower due to the > -ffast-math)，supplementary more comparison results here:
Unfortunately, the FFmpeg code is written with x87 semantics in mind. For instance, the FFmpeg math macros work nicely on x86, but they would work much better with fabs/fmax/fmin/fabsf/fmaxf/fminf on other platforms. I tried to fix that with copious amount of _Generic(), but that lead to ICE... So we are stuck between a rock and a hard place where we need fast math for good perfs, but we need to turn it off for correct results. -- ヅニ-クーモン・レミ Hagalund ny stad, f.d. Finska republik Nylands _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
