[all-commits] [llvm/llvm-project] d15fef: [IndVarSimplify] Handle the case where both operan...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/release/20.x
  Home:   https://github.com/llvm/llvm-project
  Commit: d15fef4209f12b9549509d6c6a7156d8e6cdba9e
      https://github.com/llvm/llvm-project/commit/d15fef4209f12b9549509d6c6a7156d8e6cdba9e
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2025-04-11 (Fri, 11 Apr 2025)

  Changed paths:
    M llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
    A llvm/test/Transforms/IndVarSimplify/pr135182.ll

  Log Message:
  -----------
  [IndVarSimplify] Handle the case where both operands are the same when widening IV (#135207)

`WidenIV::widenWithVariantUse` assumes that exactly one of the binop
operands is the IV to be widened. This miscompilation happens when it
tries to sign-extend the "NonIV" operand while the IV is zero-extended.
Closes https://github.com/llvm/llvm-project/issues/135182.

(cherry picked from commit d14acb78065bdd331019924feaaef52e5e744529)



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