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10250,7
2012 Sep 20
2
[LLVMdev] Proposal: New DAG node type for reciprocal operation
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