[PATCH] D66052: [DAGCombiner] Add simple folds for SMULFIX/UMULFIX/SMULFIXSAT

[Bjorn Pettersson via Phabricator via llvm-commits]

bjope created this revision.
bjope added reviewers: RKSimon, craig.topper.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

Add the following DAGCombiner folds for mulfix being
one of SMULFIX/UMULFIX/SMULFIXSAT:

  (mulfix x, undef, scale) -> 0
  (mulfix x, 0, scale) -> 0

Also added canonicalization of constants to RHS.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D66052

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/X86/mulfix_combine.ll
  llvm/test/CodeGen/X86/vector-mulfix-legalize.ll

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