Re:Six times faster than C
by seventhson on Thursday July 06, 2023 @08:52PM
(#36625542)
Linus' post is 15+ years old. Much has changed in Intel hardware since then. He was probably right on the money re the hardware available at the time.
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> I don't know when the change was made, but conditional moves are fast and efficient on the last several generations of AMD and Intel processors. Usually, you are trading 1 or 2 extra cycles of latency against the chance of a ~15 cycle mispredicted branch penalty. If your branch cannot be predicted correctly ~85% of the time, this can be a significant win.