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Add getTopBlock and getBottomBlock member functions to MachineLoopInfo.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84596 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-10-20 04:16:37 +00:00
parent 13555eae17
commit 81b16a3558
2 changed files with 39 additions and 0 deletions
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28
lib/CodeGen/MachineLoopInfo.cpp
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@ -43,3 +43,31 @@ void MachineLoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<MachineDominatorTree>();
MachineFunctionPass::getAnalysisUsage(AU);
}
MachineBasicBlock *MachineLoop::getTopBlock() {
MachineBasicBlock *TopMBB = getHeader();
MachineFunction::iterator Begin = TopMBB->getParent()->begin();
if (TopMBB != Begin) {
MachineBasicBlock *PriorMBB = prior(MachineFunction::iterator(TopMBB));
while (contains(PriorMBB)) {
TopMBB = PriorMBB;
if (TopMBB == Begin) break;
PriorMBB = prior(MachineFunction::iterator(TopMBB));
}
}
return TopMBB;
}
MachineBasicBlock *MachineLoop::getBottomBlock() {
MachineBasicBlock *BotMBB = getHeader();
MachineFunction::iterator End = BotMBB->getParent()->end();
if (BotMBB != prior(End)) {
MachineBasicBlock *NextMBB = next(MachineFunction::iterator(BotMBB));
while (contains(NextMBB)) {
BotMBB = NextMBB;
if (BotMBB == next(MachineFunction::iterator(BotMBB))) break;
NextMBB = next(MachineFunction::iterator(BotMBB));
}
}
return BotMBB;
}