MachineLoopInfo.cpp [plain text]
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
namespace llvm {
#define MLB class LoopBase<MachineBasicBlock, MachineLoop>
TEMPLATE_INSTANTIATION(MLB);
#undef MLB
#define MLIB class LoopInfoBase<MachineBasicBlock, MachineLoop>
TEMPLATE_INSTANTIATION(MLIB);
#undef MLIB
}
char MachineLoopInfo::ID = 0;
INITIALIZE_PASS_BEGIN(MachineLoopInfo, "machine-loops",
"Machine Natural Loop Construction", true, true)
INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
INITIALIZE_PASS_END(MachineLoopInfo, "machine-loops",
"Machine Natural Loop Construction", true, true)
char &llvm::MachineLoopInfoID = MachineLoopInfo::ID;
bool MachineLoopInfo::runOnMachineFunction(MachineFunction &) {
releaseMemory();
LI.Calculate(getAnalysis<MachineDominatorTree>().getBase()); return false;
}
void MachineLoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
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 = llvm::next(MachineFunction::iterator(BotMBB));
while (contains(NextMBB)) {
BotMBB = NextMBB;
if (BotMBB == llvm::next(MachineFunction::iterator(BotMBB))) break;
NextMBB = llvm::next(MachineFunction::iterator(BotMBB));
}
}
return BotMBB;
}
void MachineLoop::dump() const {
print(dbgs());
}