Le maanantaina 1. heinäkuuta 2024, 19.09.01 EEST flow gg a écrit : > I reviewed it again, the purpose of is_w is to limit lmul to a maximum of > 1/4 of vlen,
1/4 of vlen? Do you mean limit to EMUL=1 for EEW=32 and EMUL=1/4 for EEW=8? Limiting LMUL to less than 1 at maximum EEW is useless from a functional standpoint, since fractional registers cannot be addressed individually. (Of course it might still be useful for performance reasons.) > to prevent vector register shortage, which can also be > considered as vset limiting lmul. I renamed it to quarter_len_limit. TBH, I don't really understand. If a lower LMUL limit is reached, then specialisations for the corresponding VLEN are simply unncessary/infeasible and the code for lower VLEN should be used. If a higher LMUL limit is reached due to register pressure (or the 8 hard limit), then the given VLEN cannot be supported at all, or requires some completely different code. Either way, I don't really follow why vsetvlfixed macros need to be involved. -- 雷米‧德尼-库尔蒙 http://www.remlab.net/ _______________________________________________ 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".
