[llvm] [BasicAA] Analyze constant offsets through select (PR #218203)
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Sat Aug 22 22:47:20 PDT 2026
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Analysis/BasicAliasAnalysis.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Analysis/BasicAliasAnalysis.cpp b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
index fb753fae4..99d04993c 100644
--- a/llvm/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
@@ -2023,17 +2023,14 @@ bool BasicAAResult::constantOffsetHeuristic(const DecomposedGEP &GEP,
// distance from the other index. This preserves correlations such as
// select(x + 1, x + 2) versus x + 3 that range analysis loses.
auto IsNoAlias = [&](const Value *V0, const Value *V1) {
- LinearExpression E0 =
- GetLinearExpression(CastedValue(V0), DL, 0, AC, DT);
- LinearExpression E1 =
- GetLinearExpression(CastedValue(V1), DL, 0, AC, DT);
+ LinearExpression E0 = GetLinearExpression(CastedValue(V0), DL, 0, AC, DT);
+ LinearExpression E1 = GetLinearExpression(CastedValue(V1), DL, 0, AC, DT);
if (E0.Scale != E1.Scale || !E0.Val.hasSameCastsAs(E1.Val) ||
!isValueEqualInPotentialCycles(E0.Val.V, E1.Val.V, AAQI))
return false;
APInt Scale = Var0.IsNegated ? -Var0.Scale : Var0.Scale;
- APInt IndexDiff =
- (E0.Offset - E1.Offset).sextOrTrunc(Scale.getBitWidth());
+ APInt IndexDiff = (E0.Offset - E1.Offset).sextOrTrunc(Scale.getBitWidth());
APInt Diff = GEP.Offset + IndexDiff * Scale;
return Diff.isNegative() ? (-Diff).uge(V1Size) : Diff.uge(V2Size);
};
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https://github.com/llvm/llvm-project/pull/218203
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