mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-26 04:32:44 +01:00
43 lines
1.5 KiB
C++
43 lines
1.5 KiB
C++
//=- MachineLoopUtils.h - Helper functions for manipulating loops -*- C++ -*-=//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_MACHINELOOPUTILS_H
|
|
#define LLVM_CODEGEN_MACHINELOOPUTILS_H
|
|
|
|
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);
|
|
|
|
} // namespace llvm
|
|
|
|
#endif // LLVM_CODEGEN_MACHINELOOPUTILS_H
|