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ScalerEvolution: Only erase temporary values if they actually have been added 

This addresses post-review comments from Sanjoy Das for r261485.

llvm-svn: 261486
This commit is contained in:
Tobias Grosser 2016-02-21 18:50:09 +00:00
parent 11332e5ec5
commit 934fcf4dc6
1 changed files with 6 additions and 5 deletions
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11
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -3895,13 +3895,14 @@ const SCEV *ScalarEvolution::createAddRecFromPHI(PHINode *PN) {
} }
} }
} }
// Remove the temporary PHI node SCEV that has been inserted while intending
// to create an AddRecExpr for this PHI node. We can not keep this temporary
// as it will prevent later (possibly simpler) SCEV expressions to be added
// to the ValueExprMap.
ValueExprMap.erase(PN);
} }
// Remove the temporary PHI node SCEV that has been inserted while intending
// to create an AddRecExpr for this PHI node. We can not keep this temporary
// as it will prevent later (possibly simpler) SCEV expressions to be added
// to the ValueExprMap.
ValueExprMap.erase(PN);
return nullptr; return nullptr;
} }