[PATCH] D44375: [X86] Add a DAG combine to simplify PMULDQ/PMULUDQ nodes

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: spatel, RKSimon.

These nodes only use the lower 32 bits of their inputs so we can use SimplifyDemandedBits to simplify them.


https://reviews.llvm.org/D44375

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/combine-pmuldq.ll
  test/CodeGen/X86/masked_gather_scatter.ll
  test/CodeGen/X86/xop-ifma.ll

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