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Eliminate a redundant FoldingSet lookup.

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llvm-svn: 106872
This commit is contained in:
Dan Gohman 2010-06-25 18:47:08 +00:00
parent 584fae6cc4
commit 01de3704f9
1 changed files with 3 additions and 3 deletions
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6
lib/Analysis/ScalarEvolution.cpp
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@ -845,9 +845,9 @@ const SCEV *ScalarEvolution::getTruncateExpr(const SCEV *Op,
return getAddRecExpr(Operands, AddRec->getLoop());
}
// The cast wasn't folded; create an explicit cast node.
// Recompute the insert position, as it may have been invalidated.
if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
// The cast wasn't folded; create an explicit cast node. We can reuse
// the existing insert position since if we get here, we won't have
// made any changes which would invalidate it.
SCEV *S = new (SCEVAllocator) SCEVTruncateExpr(ID.Intern(SCEVAllocator),
Op, Ty);
UniqueSCEVs.InsertNode(S, IP);