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

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be out of date.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!

llvm-svn: 124282
This commit is contained in:
Nick Lewycky 2011-01-26 08:40:22 +00:00
parent db9d664244
commit d9e6b4a8ff
1 changed files with 2 additions and 0 deletions
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2
llvm/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.