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Fix bug: test/Regression/Transforms/ADCE/2002-05-23-ZeroArgPHITest.ll

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Which contains a description of why this is neccesary.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2733 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-05-23 16:52:34 +00:00
parent 37dc78d0d3
commit 89d46b0f09
1 changed files with 4 additions and 1 deletions
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5
lib/VMCore/BasicBlock.cpp
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@ -8,6 +8,7 @@
#include "llvm/iTerminators.h" #include "llvm/iTerminators.h"
#include "llvm/Type.h" #include "llvm/Type.h"
#include "llvm/Support/CFG.h" #include "llvm/Support/CFG.h"
#include "llvm/Constant.h"
#include "llvm/iPHINode.h" #include "llvm/iPHINode.h"
#include "llvm/CodeGen/MachineInstr.h" #include "llvm/CodeGen/MachineInstr.h"
@ -131,7 +132,9 @@ void BasicBlock::removePredecessor(BasicBlock *Pred) {
// If the PHI _HAD_ two uses, replace PHI node with its now *single* value // If the PHI _HAD_ two uses, replace PHI node with its now *single* value
if (max_idx == 2) if (max_idx == 2)
PN->replaceAllUsesWith(PN->getOperand(0)); PN->replaceAllUsesWith(PN->getOperand(0));
delete getInstList().remove(begin()); // Remove the PHI node else // Otherwise there are no incoming values/edges, replace with dummy
PN->replaceAllUsesWith(Constant::getNullValue(PN->getType()));
delete getInstList().remove(begin()); // Remove the PHI node
} }
} else { } else {
// Okay, now we know that we need to remove predecessor #pred_idx from all // Okay, now we know that we need to remove predecessor #pred_idx from all