Craig Topper e7211bb567 [SelectionDAG][X86] Enable iX SimplifyDemandedBits to vXi1 SimplifyDemandedVectorElts simplification. Add a hack to X86 to avoid a regression ...

Patch showing the effect of enabling bool vector oversimplification.

Non-VLX builds can simplify a kshift shuffle, but VLX builds simplify:

insert_subvector v8i zeroinitializer, v2i --> insert_subvector v8i undef, v2i

Preventing the removal of the AND to clear the upper bits of result

Differential Revision: https://reviews.llvm.org/D53022

llvm-svn: 369780

2019-08-23 17:14:58 +00:00

273 KiB

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