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if jump threading is able to infer interesting values on both

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the LHS and RHS of an and/or instruction, don't multiply add
known predecessor values.  This fixes the crash on testcase
from PR7498


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108114 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-07-12 00:47:34 +00:00
parent eae2895120
commit 0a96144aac
2 changed files with 37 additions and 2 deletions
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15
lib/Transforms/Scalar/JumpThreading.cpp
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@ -346,8 +346,19 @@ ComputeValueKnownInPredecessors(Value *V, BasicBlock *BB,PredValueInfo &Result){
}
for (unsigned i = 0, e = RHSVals.size(); i != e; ++i)
if (RHSVals[i].first == InterestingVal || RHSVals[i].first == 0) {
Result.push_back(RHSVals[i]);
Result.back().first = InterestingVal;
// If we already inferred a value for this block on the LHS, don't
// re-add it.
bool HasValue = false;
for (unsigned r = 0, e = Result.size(); r != e; ++r)
if (Result[r].second == RHSVals[i].second) {
HasValue = true;
break;
}
if (!HasValue) {
Result.push_back(RHSVals[i]);
Result.back().first = InterestingVal;
}
}
return !Result.empty();
}