[all-commits] [llvm/llvm-project] 20e37f: [GISel] Don't preserve NSW flag when converting G_...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 20e37f03c64589c366fccd766ab9120db6da4aa0
      https://github.com/llvm/llvm-project/commit/20e37f03c64589c366fccd766ab9120db6da4aa0
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2024-10-05 (Sat, 05 Oct 2024)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/combine-mul-to-shl.mir

  Log Message:
  -----------
  [GISel] Don't preserve NSW flag when converting G_MUL of INT_MIN to G_SHL. (#111230)

mul and shl have different meanings for the nsw flag. We need to drop it
when converting a multiply by the minimum negative value.



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