blob: 2cb0134ca84835df9f44591de57a1809d7efb3df [file] [log] [blame]
//=- MachineLoopUtils.h - Helper functions for manipulating loops -*- C++ -*-=//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
namespace llvm {
class MachineLoop;
class MachineBasicBlock;
class MachineRegisterInfo;
class TargetInstrInfo;
enum LoopPeelDirection {
LPD_Front, ///< Peel the first iteration of the loop.
LPD_Back ///< Peel the last iteration of the loop.
/// Peels a single block loop. Loop must have two successors, one of which
/// must be itself. Similarly it must have two predecessors, one of which must
/// be itself.
/// The loop block is copied and inserted into the CFG such that two copies of
/// the loop follow on from each other. The copy is inserted either before or
/// after the loop based on Direction.
/// Phis are updated and an unconditional branch inserted at the end of the
/// clone so as to execute a single iteration.
/// The trip count of Loop is not updated.
MachineBasicBlock *PeelSingleBlockLoop(LoopPeelDirection Direction,
MachineBasicBlock *Loop,
MachineRegisterInfo &MRI,
const TargetInstrInfo *TII);
/// Return true if PhysReg is live outside the loop, i.e. determine if it
/// is live in the loop exit blocks, and false otherwise.
bool isRegLiveInExitBlocks(MachineLoop *Loop, int PhysReg);
} // namespace llvm