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Preserve LCSSA.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41246 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-08-21 19:47:46 +00:00
parent e79bad66e0
commit 60cbab4252
1 changed files with 15 additions and 1 deletions
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16
lib/Transforms/Scalar/LoopIndexSplit.cpp
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@ -835,7 +835,7 @@ bool LoopIndexSplit::splitLoop(SplitInfo &SD) {
assert (!L->contains(ExitDest) && " Unable to find exit edge destination");
//[*] Split Exit Edge.
SplitEdge(ExitingBlock, FalseHeader, this);
BasicBlock *TL_ExitBlock = SplitEdge(ExitingBlock, FalseHeader, this);
//[*] Eliminate split condition's false branch from True loop.
BranchInst *BR = cast<BranchInst>(SplitBlock->getTerminator());
@ -853,6 +853,20 @@ bool LoopIndexSplit::splitLoop(SplitInfo &SD) {
FBR->setUnconditionalDest(FBR->getSuccessor(1));
removeBlocks(TBB, FalseLoop, cast<BasicBlock>(FBR->getSuccessor(0)));
//[*] Preserve LCSSA
for(BasicBlock::iterator BI = FalseHeader->begin(), BE = FalseHeader->end();
BI != BE; ++BI) {
if (PHINode *PN = dyn_cast<PHINode>(BI)) {
Value *V1 = PN->getIncomingValueForBlock(TL_ExitBlock);
PHINode *newPHI = new PHINode(PN->getType(), PN->getName());
newPHI->addIncoming(V1, ExitingBlock);
TL_ExitBlock->getInstList().push_front(newPHI);
PN->removeIncomingValue(TL_ExitBlock);
PN->addIncoming(newPHI, TL_ExitBlock);
} else
break;
}
return true;
}