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Fix memory corruption. If one of the SCEV creation functions calls another but

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doesn't return immediately after then the insert position in UniqueSCEVs will
be out of date. No test because this is a memory corruption issue. Fixes PR9051!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124282 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2011-01-26 08:40:22 +00:00
parent 5d83955b8c
commit e19b7b80bd
1 changed files with 2 additions and 0 deletions
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2
lib/Analysis/ScalarEvolution.cpp
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@ -831,6 +831,7 @@ const SCEV *ScalarEvolution::getTruncateExpr(const SCEV *Op,
}
if (!hasTrunc)
return getAddExpr(Operands, false, false);
UniqueSCEVs.FindNodeOrInsertPos(ID, IP); // Mutates IP, returns NULL.
}
// trunc(x1*x2*...*xN) --> trunc(x1)*trunc(x2)*...*trunc(xN) if we can
@ -845,6 +846,7 @@ const SCEV *ScalarEvolution::getTruncateExpr(const SCEV *Op,
}
if (!hasTrunc)
return getMulExpr(Operands, false, false);
UniqueSCEVs.FindNodeOrInsertPos(ID, IP); // Mutates IP, returns NULL.
}
// If the input value is a chrec scev, truncate the chrec's operands.