[PATCH] D22038: [X86] Transform zext+seteq+cmp into shr+lzcnt on btver2 architecture.

Sanjay Patel via llvm-commits llvm-commits at lists.llvm.org
Wed Jul 6 09:32:51 PDT 2016

spatel added a comment.

Did you look at doing this in DAGCombine with a TLI hook? PPC already has this or something very close in PPCTargetLowering::LowerSETCC(), so it seems like the code could simply be lifted up from there?

Would x86 targets other than btver2 want to do this transform when optimizing for size?


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