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by DullPointer
192 days ago
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ARM is a big target, there could be cpus where lsl is 1 cycle and add is 2+. Without knowing about specific compiler targets/settings this looks reasonable. Dumb in the majority case? Absolutely, but smart on the lowest common denominator. |
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But we do, armv8-a clang 21.1.0 with O3, and it doesn't.
> […] but smart on the lowest common denominator.
No, that would be the single add instruction.