[PATCH] D62613: [DAGCombiner] Replace gathers with a zero mask with the passthru value

[Benjamin Kramer via Phabricator via llvm-commits]

bkramer created this revision.
bkramer added a reviewer: craig.topper.
Herald added subscribers: hiraditya, javed.absar, jlebar.
Herald added a project: LLVM.

These can be created by the legalizer when splitting a larger gather.
Also make isNullOrNullSplat a bit smarter by ignoring truncation in
BUILD_VECTORs.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D62613

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/test/CodeGen/AArch64/vecreduce-bool.ll
  llvm/test/CodeGen/X86/avx2-masked-gather.ll

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