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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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11
include/llvm/CodeGen/MachineLoopInfo.h
View File

@ -38,6 +38,17 @@ namespace llvm {
class MachineLoop : public LoopBase<MachineBasicBlock, MachineLoop> {
public:
MachineLoop();
/// getTopBlock - Return the "top" block in the loop, which is the first
/// block in the linear layout, ignoring any parts of the loop not
/// contiguous with the part the contains the header.
MachineBasicBlock *getTopBlock();
/// getBottomBlock - Return the "bottom" block in the loop, which is the last
/// block in the linear layout, ignoring any parts of the loop not
/// contiguous with the part the contains the header.
MachineBasicBlock *getBottomBlock();
private:
friend class LoopInfoBase<MachineBasicBlock, MachineLoop>;
explicit MachineLoop(MachineBasicBlock *MBB)

28
lib/CodeGen/MachineLoopInfo.cpp
View File

@ -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;
}