Re:Better-performing "25519" elliptic-curve cryptography
by inopinatus on Friday September 13, 2024 @11:23AM
(#41532069)
I see they learned clang’s dirty little secret over intrinsics viz. that in producing the IR it deviates (sometimes dramatically when AVX-512 is concerned) from the documented opcodes and the results are inevitably detrimental.
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Re:Better-performing "25519" elliptic-curve cryptography
by astrange on Friday September 13, 2024 @07:46PM
(#41536223)
This is why ffmpeg uses assembly, and people get extremely mad when you say it's done for a reason, because they always want to come up with a fancier abstraction (usually cross-platform) which then defeats the purpose because it doesn't actually work.