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2012 Sep 20
0
[LLVMdev] Proposal: New DAG node type for reciprocal operation
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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