On 14/10/2024 23:26, Michael Niedermayer wrote: > On Sat, Oct 05, 2024 at 03:38:05PM -0700, Frank Plowman wrote: >> The first branch of this ternary expression was intended to avoid >> having two shift operations in the case the RHS is not known at >> compile time. It only works if the LHS has a signed type however, >> otherwise the result is invalid. > > If the expression is faster, why not check if its signed ? > > if its not faster, then the argument could be that its not > faster and removes complexity > > thx >
In a quick microbenchmark (clang 16, AArch64), the bithack is 10% faster with -O0 but there is no significant difference with -O1 and up. Cheers, -- Frank _______________________________________________ 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".
