Hi, On Thu, May 30, 2024 at 10:03 AM Tomas Härdin <g...@haerdin.se> wrote:
> tor 2024-05-30 klockan 16:06 +0300 skrev Rémi Denis-Courmont: > > > > > > Le 30 mai 2024 12:50:05 GMT+03:00, "Tomas Härdin" <g...@haerdin.se> a > > écrit : > > > tor 2024-05-30 klockan 10:54 +0300 skrev Rémi Denis-Courmont: > > > > Can't we just use the compiler built-ins here? AFAIK, they (GCC, > > > > LLVM) use the same algorithm if the CPU doesn't support native > > > > CTZ. > > > > And they will pick the right instruction if CPU does have CTZ. > > > > > > > > I get it that maybe it wasn't working so well 20 years ago, but > > > > we've > > > > increased compiler version requirements since then. > > > > > > I think we still support MSVC, but maybe we shouldn't? It's > > > possible to > > > cross-compile for Windows either way. > > > > I don't get how that prevents using the GCC and Clang builtins (on > > GCC and Clang). > > Does MSVC have builtins for these? Do all compilers we support? > I think what Remi is suggesting is that someone (maybe Remi himself, maybe you, maybe me, maybe someone else) should send a patch to use the built-ins when available. Where not, we would continue using the C versions. All of this is unrelated to this patch, which would continue to be useful for the C fallback. Ronald _______________________________________________ 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".
