llvm/llvm/lib/CodeGen/LiveIntervalCalc.cpp

//===- LiveIntervalCalc.cpp - Calculate live interval --------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Implementation of the LiveIntervalCalc class.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/LiveIntervalCalc.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/LiveInterval.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/MC/LaneBitmask.h"
#include "llvm/Support/ErrorHandling.h"
#include <cassert>

usingnamespacellvm;

#define DEBUG_TYPE …

// Reserve an address that indicates a value that is known to be "undef".
static VNInfo UndefVNI(0xbad, SlotIndex());

static void createDeadDef(SlotIndexes &Indexes, VNInfo::Allocator &Alloc,
                          LiveRange &LR, const MachineOperand &MO) { … }

void LiveIntervalCalc::calculate(LiveInterval &LI, bool TrackSubRegs) { … }

void LiveIntervalCalc::constructMainRangeFromSubranges(LiveInterval &LI) { … }

void LiveIntervalCalc::createDeadDefs(LiveRange &LR, Register Reg) { … }

void LiveIntervalCalc::extendToUses(LiveRange &LR, Register Reg,
                                    LaneBitmask Mask, LiveInterval *LI) { … }