Simon Pilgrim e24441aab0 [TargetLowering] Add SimplifyDemandedBits support for ISD::INSERT_VECTOR_ELT ...

This helps us relax the extension of a lot of scalar elements before they are inserted into a vector.

Its exposes an issue in DAGCombiner::convertBuildVecZextToZext as some/all the zero-extensions may be relaxed to ANY_EXTEND, so we need to handle that case to avoid a couple of AVX2 VPMOVZX test regressions.

Once this is in it should be easier to fix a number of remaining failures to fold loads into VBROADCAST nodes.

Differential Revision: https://reviews.llvm.org/D59484

llvm-svn: 356989

2019-03-26 12:32:01 +00:00

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