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submitted 1 week ago by abhi9u@lemmy.world to c/technology@lemmy.world

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[–] InverseParallax@lemmy.world 1 points 1 week ago

Really depends on the target, llvm goes between unrollimg and vectorizing cleanly, to unrollimg to a ludicrous degree, to refusing to unroll period.

Some of it is subtarget specific, but sometimes it's just weird.

Gcc is evil incarnate, all it's passes are at war with each other, loop Canon form often broke vectorization and even unrolling period.