[all-commits] [llvm/llvm-project] 405c01: DAG: Simplify demanded bits for truncating atomic_...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 405c018c71fb685425df4fe173e54f5edc5d6979
      https://github.com/llvm/llvm-project/commit/405c018c71fb685425df4fe173e54f5edc5d6979
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2024-04-26 (Fri, 26 Apr 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

  Log Message:
  -----------
  DAG: Simplify demanded bits for truncating atomic_store (#90113)

It's really unfortunate that STORE and ATOMIC_STORE are separate
opcodes. This duplicates a basic simplify demanded for the truncating
case. This avoids some AMDGPU lit regressions in a future patch.

I'm not sure how to craft a test that exposes this without first
introducing the regressions by promoting half to i16.



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