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Break infinite loop.

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llvm-svn: 41091
This commit is contained in:
Devang Patel 2007-08-14 23:59:17 +00:00
parent d39b9d41bb
commit 1dd44d7501
1 changed files with 17 additions and 15 deletions
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32
lib/Transforms/Utils/CloneLoop.cpp
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@ -84,22 +84,21 @@ Loop *llvm::CloneLoop(Loop *OrigL, LPPassManager *LPM, LoopInfo *LI,
}
SmallVector<BasicBlock *, 16> NewBlocks;
SmallVector<std::pair<Loop *, Loop::iterator>, 8> LoopNest;
LoopNest.push_back(std::make_pair(OrigL, OrigL->begin()));
Loop *NewLoop = NULL;
while (!LoopNest.empty()) {
Loop *L = LoopNest.back().first;
Loop::iterator SubLoop = LoopNest.back().second;
// Handle sub loops.
if (SubLoop != L->end()) {
Loop *SL = *SubLoop;
LoopNest.push_back(std::make_pair(SL, SL->begin()));
}
// Populate loop nest.
SmallVector<Loop *, 8> LoopNest;
LoopNest.push_back(OrigL);
Loop *NewParentLoop = NULL;
while (!LoopNest.empty()) {
Loop *L = LoopNest.back();
LoopNest.pop_back();
NewLoop = new Loop();
Loop *NewLoop = new Loop();
if (!NewParentLoop)
NewParentLoop = NewLoop;
LPM->insertLoop(NewLoop, L->getParentLoop());
// Clone Basic Blocks.
@ -122,6 +121,9 @@ Loop *llvm::CloneLoop(Loop *OrigL, LPPassManager *LPM, LoopInfo *LI,
CloneDominatorInfo(BB, ValueMap, DT, DF);
}
// Process sub loops
for (Loop::iterator I = L->begin(), E = L->end(); I != E; ++I)
LoopNest.push_back(*I);
}
// Remap instructions to reference operands from ValueMap.
@ -145,5 +147,5 @@ Loop *llvm::CloneLoop(Loop *OrigL, LPPassManager *LPM, LoopInfo *LI,
Function *F = Latch->getParent();
F->getBasicBlockList().insert(Latch, NewBlocks.begin(), NewBlocks.end());
return NewLoop;
return NewParentLoop;
}