Yingwei Zheng d14acb7806 [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.

2025-04-11 09:03:06 +08:00

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