[all-commits] [llvm/llvm-project] 213111: [InstCombine] Drop Range attribute when simplifyin...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2131115be5b9d8b39af80973d9b64c0adc41d38d
      https://github.com/llvm/llvm-project/commit/2131115be5b9d8b39af80973d9b64c0adc41d38d
  Author: Fangrui Song <i at maskray.me>
  Date:   2025-01-25 (Sat, 25 Jan 2025)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
    M llvm/test/Transforms/InstCombine/fsh.ll

  Log Message:
  -----------
  [InstCombine] Drop Range attribute when simplifying 'fshl' based on demanded bits (#124429)

When simplifying operands based on demanded bits, the return value range
of llvm.fshl might change. Keeping the Range attribute might cause
llvm.fshl to generate a poison and lead to miscompile. Drop the Range
attribute similar to `dropPosonGeneratingFlags` elsewhere.

Fix #124387



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