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Sounds like a reasonable fit for a target-specific DAG combine. I suspect a target specific node wouldn't be necessary and the patterns could be matched directly. -Jim On Sep 20, 2012, at 3:26 PM, Weiming Zhao <weimingz at codeaurora.org> wrote: > Hi, > > In relaxed/fast math mode, if we can convert a/b to a * (1/b), we may get more performance when (1) “b” is loop

Hi, In relaxed/fast math mode, if we can convert a/b to a * (1/b), we may get more performance when (1) "b" is loop invariant or (2) arch has faster reciprocal instruction (e.g. recipe/recips on ARM) or (3) arch has no vector div, but has vector mul and recip. So ,with this node type, a div node can be converted to a mul and a recip when desired. Then, each arch can further

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