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Fix a subtle miscompilation. This allows 197.parser to be compiled correctly.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40791 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-08-03 19:59:35 +00:00
parent 4b55c3b0f1
commit ab8702787d
1 changed files with 8 additions and 6 deletions
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14
lib/Transforms/Scalar/GVN.cpp
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@ -726,21 +726,23 @@ Value *GVN::GetValueForBlock(BasicBlock *BB, LoadInst* orig,
bool top_level) {
// If we have already computed this value, return the previously computed val.
Value *V = Phis[BB];
if (V && ! top_level) return V;
DenseMap<BasicBlock*, Value*>::iterator V = Phis.find(BB);
if (V != Phis.end() && !top_level) return V->second;
BasicBlock* singlePred = BB->getSinglePredecessor();
if (singlePred) {
V = GetValueForBlock(singlePred, orig, Phis);
Phis[BB] = V;
return V;
Value *ret = GetValueForBlock(singlePred, orig, Phis);
Phis[BB] = ret;
return ret;
}
// Otherwise, the idom is the loop, so we need to insert a PHI node. Do so
// now, then get values to fill in the incoming values for the PHI.
PHINode *PN = new PHINode(orig->getType(), orig->getName()+".rle",
BB->begin());
PN->reserveOperandSpace(std::distance(pred_begin(BB), pred_end(BB)));
Phis[BB] = PN;
if (Phis.count(BB) == 0)
Phis.insert(std::make_pair(BB, PN));
bool all_same = true;
Value* first = 0;