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We need to make sure to remove PHI nodes in the successor that cannot be

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executed when removing branch dest.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2001-06-29 05:23:10 +00:00
parent 1be1d79a1d
commit bca26a4c6b
1 changed files with 8 additions and 0 deletions
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8
lib/Transforms/Scalar/ConstantProp.cpp
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@@ -129,6 +129,14 @@ inline static bool ConstantFoldTerminator(TerminatorInst *T) {
// YES. Change to unconditional branch... // YES. Change to unconditional branch...
ConstPoolBool *Cond = (ConstPoolBool*)BI->getOperand(2); ConstPoolBool *Cond = (ConstPoolBool*)BI->getOperand(2);
Value *Destination = BI->getOperand(Cond->getValue() ? 0 : 1); Value *Destination = BI->getOperand(Cond->getValue() ? 0 : 1);
Value *OldDest = BI->getOperand(Cond->getValue() ? 1 : 0);
//cerr << "Method: " << T->getParent()->getParent() << "\nRemoving branch from " << T->getParent() << "\n\nTo: " << OldDest << endl;
// Let the basic block know that we are letting go of it. Based on this,
// it will adjust it's PHI nodes.
assert(T->getParent() && "Terminator not inserted in block!");
OldDest->castBasicBlockAsserting()->removePredecessor(T->getParent());
BI->setOperand(0, Destination); // Set the unconditional destination BI->setOperand(0, Destination); // Set the unconditional destination
BI->setOperand(1, 0); // Clear the conditional destination BI->setOperand(1, 0); // Clear the conditional destination