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[SCEV] Check bitwidth for constant ranges comparison #150364

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[SCEV] Check bitwidth for constant ranges comparison #150364

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3 changes: 2 additions & 1 deletion llvm/lib/Analysis/ScalarEvolution.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11380,7 +11380,8 @@ bool ScalarEvolution::isKnownPredicateViaConstantRanges(CmpPredicate Pred,
auto CheckRange = [&](bool IsSigned) {
auto RangeLHS = IsSigned ? getSignedRange(LHS) : getUnsignedRange(LHS);
auto RangeRHS = IsSigned ? getSignedRange(RHS) : getUnsignedRange(RHS);
return RangeLHS.icmp(Pred, RangeRHS);
return RangeLHS.getBitWidth() == RangeRHS.getBitWidth() &&
RangeLHS.icmp(Pred, RangeRHS);
};

// The check at the top of the function catches the case where the values are
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