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Add code to ensure that no PHI nodes are left laying around with their
arguments dropped. This fixes bug: test/Regression/Transforms/ADCE/2002-07-17-PHIAssertion.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3134 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -284,9 +284,23 @@ bool ADCE::doADCE() {
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// sweep over the program can safely delete dead instructions without
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// other dead instructions still refering to them.
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//
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for (BasicBlock::iterator I = BB->begin(), E = --BB->end(); I != E; ++I)
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if (!LiveSet.count(I)) // Is this instruction alive?
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for (BasicBlock::iterator I = BB->begin(), E = --BB->end(); I != E; )
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if (!LiveSet.count(I)) { // Is this instruction alive?
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I->dropAllReferences(); // Nope, drop references...
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if (PHINode *PN = dyn_cast<PHINode>(&*I)) {
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// We don't want to leave PHI nodes in the program that have
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// #arguments != #predecessors, so we remove them now.
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//
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PN->replaceAllUsesWith(Constant::getNullValue(PN->getType()));
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// Delete the instruction...
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I = BB->getInstList().erase(I);
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} else {
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++I;
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}
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} else {
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++I;
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}
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}
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}
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