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Imported Upstream version 5.18.0.167

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Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a
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Xamarin Public Jenkins (auto-signing)
2018-10-20 08:25:10 +00:00
parent e19d552987
commit b084638f15
28489 changed files with 184 additions and 3866856 deletions
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146
external/llvm/lib/CodeGen/LiveRegUnits.cpp vendored
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@ -1,146 +0,0 @@
//===- LiveRegUnits.cpp - Register Unit Set -------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file This file imlements the LiveRegUnits set.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/LiveRegUnits.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBundle.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
using namespace llvm;
void LiveRegUnits::removeRegsNotPreserved(const uint32_t *RegMask) {
for (unsigned U = 0, E = TRI->getNumRegUnits(); U != E; ++U) {
for (MCRegUnitRootIterator RootReg(U, TRI); RootReg.isValid(); ++RootReg) {
if (MachineOperand::clobbersPhysReg(RegMask, *RootReg))
Units.reset(U);
}
}
}
void LiveRegUnits::addRegsInMask(const uint32_t *RegMask) {
for (unsigned U = 0, E = TRI->getNumRegUnits(); U != E; ++U) {
for (MCRegUnitRootIterator RootReg(U, TRI); RootReg.isValid(); ++RootReg) {
if (MachineOperand::clobbersPhysReg(RegMask, *RootReg))
Units.set(U);
}
}
}
void LiveRegUnits::stepBackward(const MachineInstr &MI) {
// Remove defined registers and regmask kills from the set.
for (ConstMIBundleOperands O(MI); O.isValid(); ++O) {
if (O->isReg()) {
if (!O->isDef())
continue;
unsigned Reg = O->getReg();
if (!TargetRegisterInfo::isPhysicalRegister(Reg))
continue;
removeReg(Reg);
} else if (O->isRegMask())
removeRegsNotPreserved(O->getRegMask());
}
// Add uses to the set.
for (ConstMIBundleOperands O(MI); O.isValid(); ++O) {
if (!O->isReg() || !O->readsReg())
continue;
unsigned Reg = O->getReg();
if (!TargetRegisterInfo::isPhysicalRegister(Reg))
continue;
addReg(Reg);
}
}
void LiveRegUnits::accumulate(const MachineInstr &MI) {
// Add defs, uses and regmask clobbers to the set.
for (ConstMIBundleOperands O(MI); O.isValid(); ++O) {
if (O->isReg()) {
unsigned Reg = O->getReg();
if (!TargetRegisterInfo::isPhysicalRegister(Reg))
continue;
if (!O->isDef() && !O->readsReg())
continue;
addReg(Reg);
} else if (O->isRegMask())
addRegsInMask(O->getRegMask());
}
}
/// Add live-in registers of basic block \p MBB to \p LiveUnits.
static void addBlockLiveIns(LiveRegUnits &LiveUnits,
const MachineBasicBlock &MBB) {
for (const auto &LI : MBB.liveins())
LiveUnits.addRegMasked(LI.PhysReg, LI.LaneMask);
}
/// Adds all callee saved registers to \p LiveUnits.
static void addCalleeSavedRegs(LiveRegUnits &LiveUnits,
const MachineFunction &MF) {
const MachineRegisterInfo &MRI = MF.getRegInfo();
for (const MCPhysReg *CSR = MRI.getCalleeSavedRegs(); CSR && *CSR; ++CSR)
LiveUnits.addReg(*CSR);
}
void LiveRegUnits::addPristines(const MachineFunction &MF) {
const MachineFrameInfo &MFI = MF.getFrameInfo();
if (!MFI.isCalleeSavedInfoValid())
return;
/// This function will usually be called on an empty object, handle this
/// as a special case.
if (empty()) {
/// Add all callee saved regs, then remove the ones that are saved and
/// restored.
addCalleeSavedRegs(*this, MF);
/// Remove the ones that are not saved/restored; they are pristine.
for (const CalleeSavedInfo &Info : MFI.getCalleeSavedInfo())
removeReg(Info.getReg());
return;
}
/// If a callee-saved register that is not pristine is already present
/// in the set, we should make sure that it stays in it. Precompute the
/// set of pristine registers in a separate object.
/// Add all callee saved regs, then remove the ones that are saved+restored.
LiveRegUnits Pristine(*TRI);
addCalleeSavedRegs(Pristine, MF);
/// Remove the ones that are not saved/restored; they are pristine.
for (const CalleeSavedInfo &Info : MFI.getCalleeSavedInfo())
Pristine.removeReg(Info.getReg());
addUnits(Pristine.getBitVector());
}
void LiveRegUnits::addLiveOuts(const MachineBasicBlock &MBB) {
const MachineFunction &MF = *MBB.getParent();
if (!MBB.succ_empty()) {
addPristines(MF);
// To get the live-outs we simply merge the live-ins of all successors.
for (const MachineBasicBlock *Succ : MBB.successors())
addBlockLiveIns(*this, *Succ);
} else if (MBB.isReturnBlock()) {
// For the return block: Add all callee saved registers.
const MachineFrameInfo &MFI = MF.getFrameInfo();
if (MFI.isCalleeSavedInfoValid())
addCalleeSavedRegs(*this, MF);
}
}
void LiveRegUnits::addLiveIns(const MachineBasicBlock &MBB) {
const MachineFunction &MF = *MBB.getParent();
addPristines(MF);
addBlockLiveIns(*this, MBB);
}