[PATCH] D53643: [TargetLowering] Add SimplifyDemandedBitsForTargetNode callback + add PMULDQ/PMULUDQ handling

[Simon Pilgrim via Phabricator via llvm-commits]

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

This patch is in 2 parts (which would be committed separately):

1 - Add the SimplifyDemandedBitsForTargetNode callback to handle target nodes.

2 - Add X86 SimplifyDemandedBitsForTargetNode and use it to simplify PMULDQ/PMULUDQ target nodes. This enables us to repeatedly simplify the node's arguments after the previous approach had to be reverted due to PR39398.


Repository:
  rL LLVM

https://reviews.llvm.org/D53643

Files:
  include/llvm/CodeGen/TargetLowering.h
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/X86/combine-pmuldq.ll
  test/CodeGen/X86/urem-seteq-vec-nonsplat.ll

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