//
// This file defines the MachineLoopInfo class that is used to identify natural
// loops and determine the loop depth of various nodes of the CFG. Note that
-// the loops identified may actually be several natural loops that share the
+// the loops identified may actually be several natural loops that share the
// same header node... not just a single natural loop.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineLoopInfo.h"
+#include "llvm/Analysis/LoopInfoImpl.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
-TEMPLATE_INSTANTIATION(class LoopBase<MachineBasicBlock>);
-TEMPLATE_INSTANTIATION(class LoopInfoBase<MachineBasicBlock>);
+// Explicitly instantiate methods in LoopInfoImpl.h for MI-level Loops.
+template class llvm::LoopBase<MachineBasicBlock, MachineLoop>;
+template class llvm::LoopInfoBase<MachineBasicBlock, MachineLoop>;
char MachineLoopInfo::ID = 0;
-static RegisterPass<MachineLoopInfo>
-X("machine-loops", "Machine Natural Loop Construction", true);
+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)
-const PassInfo *const llvm::MachineLoopInfoID = &X;
+char &llvm::MachineLoopInfoID = MachineLoopInfo::ID;
bool MachineLoopInfo::runOnMachineFunction(MachineFunction &) {
releaseMemory();
- LI->Calculate(getAnalysis<MachineDominatorTree>().getBase()); // Update
+ LI.analyze(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 = &*std::prev(TopMBB->getIterator());
+ while (contains(PriorMBB)) {
+ TopMBB = PriorMBB;
+ if (TopMBB == Begin) break;
+ PriorMBB = &*std::prev(TopMBB->getIterator());
+ }
+ }
+ return TopMBB;
+}
+
+MachineBasicBlock *MachineLoop::getBottomBlock() {
+ MachineBasicBlock *BotMBB = getHeader();
+ MachineFunction::iterator End = BotMBB->getParent()->end();
+ if (BotMBB != std::prev(End)) {
+ MachineBasicBlock *NextMBB = &*std::next(BotMBB->getIterator());
+ while (contains(NextMBB)) {
+ BotMBB = NextMBB;
+ if (BotMBB == &*std::next(BotMBB->getIterator()))
+ break;
+ NextMBB = &*std::next(BotMBB->getIterator());
+ }
+ }
+ return BotMBB;
+}
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+void MachineLoop::dump() const {
+ print(dbgs());
+}
+#endif