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Fix Bug: LowerSwitch/2003-05-01-PHIProblem.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5979 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-05-01 22:21:21 +00:00
parent 3d73c706e1
commit 20af3222da
1 changed files with 12 additions and 2 deletions
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14
lib/Transforms/Utils/LowerSwitch.cpp
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@ -84,7 +84,7 @@ void LowerSwitch::processSwitchInst(SwitchInst *SI) {
Instruction *Br = new BranchInst(Succ, NextBlock, Comp); Instruction *Br = new BranchInst(Succ, NextBlock, Comp);
CurBlock->getInstList().push_back(Br); CurBlock->getInstList().push_back(Br);
// If there were any PHI nodes in this success, rewrite one entry from // If there were any PHI nodes in this successor, rewrite one entry from
// OrigBlock to come from CurBlock. // OrigBlock to come from CurBlock.
for (BasicBlock::iterator I = Succ->begin(); for (BasicBlock::iterator I = Succ->begin();
PHINode *PN = dyn_cast<PHINode>(I); ++I) { PHINode *PN = dyn_cast<PHINode>(I); ++I) {
@ -93,10 +93,20 @@ void LowerSwitch::processSwitchInst(SwitchInst *SI) {
PN->setIncomingBlock((unsigned)BlockIdx, CurBlock); PN->setIncomingBlock((unsigned)BlockIdx, CurBlock);
} }
if (i == e-2) { // Is this looking at the default destination?
// If there is an entry in any PHI nodes for the default edge, make sure
// to update them as well.
for (BasicBlock::iterator I = NextBlock->begin();
PHINode *PN = dyn_cast<PHINode>(I); ++I) {
int BlockIdx = PN->getBasicBlockIndex(OrigBlock);
assert(BlockIdx != -1 && "Switch didn't go to this successor??");
PN->setIncomingBlock((unsigned)BlockIdx, CurBlock);
}
}
CurBlock = NextBlock; // Move on to the next condition CurBlock = NextBlock; // Move on to the next condition
} }
// We are now done with the switch instruction, delete it. // We are now done with the switch instruction, delete it.
delete SI; delete SI;
} }