2012-08-15 19:34:23 +00:00
|
|
|
//===-- RegisterPressure.cpp - Dynamic Register Pressure ------------------===//
|
|
|
|
//
|
|
|
|
// The LLVM Compiler Infrastructure
|
|
|
|
//
|
|
|
|
// This file is distributed under the University of Illinois Open Source
|
|
|
|
// License. See LICENSE.TXT for details.
|
|
|
|
//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//
|
|
|
|
// This file implements the RegisterPressure class which can be used to track
|
|
|
|
// MachineInstr level register pressure.
|
|
|
|
//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
|
|
#include "llvm/CodeGen/LiveInterval.h"
|
|
|
|
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
|
|
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
|
|
|
#include "llvm/CodeGen/RegisterClassInfo.h"
|
|
|
|
#include "llvm/CodeGen/RegisterPressure.h"
|
|
|
|
#include "llvm/Target/TargetMachine.h"
|
|
|
|
#include "llvm/Support/Debug.h"
|
|
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
|
|
|
|
using namespace llvm;
|
|
|
|
|
|
|
|
/// Increase register pressure for each set impacted by this register class.
|
|
|
|
static void increaseSetPressure(std::vector<unsigned> &CurrSetPressure,
|
|
|
|
std::vector<unsigned> &MaxSetPressure,
|
|
|
|
const TargetRegisterClass *RC,
|
|
|
|
const TargetRegisterInfo *TRI) {
|
|
|
|
unsigned Weight = TRI->getRegClassWeight(RC).RegWeight;
|
|
|
|
for (const int *PSet = TRI->getRegClassPressureSets(RC);
|
|
|
|
*PSet != -1; ++PSet) {
|
|
|
|
CurrSetPressure[*PSet] += Weight;
|
|
|
|
if (&CurrSetPressure != &MaxSetPressure
|
|
|
|
&& CurrSetPressure[*PSet] > MaxSetPressure[*PSet]) {
|
|
|
|
MaxSetPressure[*PSet] = CurrSetPressure[*PSet];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Decrease register pressure for each set impacted by this register class.
|
|
|
|
static void decreaseSetPressure(std::vector<unsigned> &CurrSetPressure,
|
|
|
|
const TargetRegisterClass *RC,
|
|
|
|
const TargetRegisterInfo *TRI) {
|
|
|
|
unsigned Weight = TRI->getRegClassWeight(RC).RegWeight;
|
|
|
|
for (const int *PSet = TRI->getRegClassPressureSets(RC);
|
|
|
|
*PSet != -1; ++PSet) {
|
|
|
|
assert(CurrSetPressure[*PSet] >= Weight && "register pressure underflow");
|
|
|
|
CurrSetPressure[*PSet] -= Weight;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Directly increase pressure only within this RegisterPressure result.
|
|
|
|
void RegisterPressure::increase(const TargetRegisterClass *RC,
|
|
|
|
const TargetRegisterInfo *TRI) {
|
|
|
|
increaseSetPressure(MaxSetPressure, MaxSetPressure, RC, TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Directly decrease pressure only within this RegisterPressure result.
|
|
|
|
void RegisterPressure::decrease(const TargetRegisterClass *RC,
|
|
|
|
const TargetRegisterInfo *TRI) {
|
|
|
|
decreaseSetPressure(MaxSetPressure, RC, TRI);
|
|
|
|
}
|
|
|
|
|
2012-12-02 13:10:19 +00:00
|
|
|
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
|
|
|
|
void RegisterPressure::dump(const TargetRegisterInfo *TRI) const {
|
2012-08-15 19:34:23 +00:00
|
|
|
dbgs() << "Live In: ";
|
|
|
|
for (unsigned i = 0, e = LiveInRegs.size(); i < e; ++i)
|
|
|
|
dbgs() << PrintReg(LiveInRegs[i], TRI) << " ";
|
|
|
|
dbgs() << '\n';
|
|
|
|
dbgs() << "Live Out: ";
|
|
|
|
for (unsigned i = 0, e = LiveOutRegs.size(); i < e; ++i)
|
|
|
|
dbgs() << PrintReg(LiveOutRegs[i], TRI) << " ";
|
|
|
|
dbgs() << '\n';
|
|
|
|
for (unsigned i = 0, e = MaxSetPressure.size(); i < e; ++i) {
|
|
|
|
if (MaxSetPressure[i] != 0)
|
|
|
|
dbgs() << TRI->getRegPressureSetName(i) << "=" << MaxSetPressure[i]
|
|
|
|
<< '\n';
|
|
|
|
}
|
|
|
|
}
|
2012-12-02 13:10:19 +00:00
|
|
|
#endif
|
2012-08-15 19:34:23 +00:00
|
|
|
|
|
|
|
/// Increase the current pressure as impacted by these physical registers and
|
|
|
|
/// bump the high water mark if needed.
|
|
|
|
void RegPressureTracker::increasePhysRegPressure(ArrayRef<unsigned> Regs) {
|
|
|
|
for (unsigned I = 0, E = Regs.size(); I != E; ++I)
|
|
|
|
increaseSetPressure(CurrSetPressure, P.MaxSetPressure,
|
|
|
|
TRI->getMinimalPhysRegClass(Regs[I]), TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Simply decrease the current pressure as impacted by these physcial
|
|
|
|
/// registers.
|
|
|
|
void RegPressureTracker::decreasePhysRegPressure(ArrayRef<unsigned> Regs) {
|
|
|
|
for (unsigned I = 0, E = Regs.size(); I != E; ++I)
|
|
|
|
decreaseSetPressure(CurrSetPressure, TRI->getMinimalPhysRegClass(Regs[I]),
|
|
|
|
TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Increase the current pressure as impacted by these virtual registers and
|
|
|
|
/// bump the high water mark if needed.
|
|
|
|
void RegPressureTracker::increaseVirtRegPressure(ArrayRef<unsigned> Regs) {
|
|
|
|
for (unsigned I = 0, E = Regs.size(); I != E; ++I)
|
|
|
|
increaseSetPressure(CurrSetPressure, P.MaxSetPressure,
|
|
|
|
MRI->getRegClass(Regs[I]), TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Simply decrease the current pressure as impacted by these virtual registers.
|
|
|
|
void RegPressureTracker::decreaseVirtRegPressure(ArrayRef<unsigned> Regs) {
|
|
|
|
for (unsigned I = 0, E = Regs.size(); I != E; ++I)
|
|
|
|
decreaseSetPressure(CurrSetPressure, MRI->getRegClass(Regs[I]), TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Clear the result so it can be used for another round of pressure tracking.
|
|
|
|
void IntervalPressure::reset() {
|
|
|
|
TopIdx = BottomIdx = SlotIndex();
|
|
|
|
MaxSetPressure.clear();
|
|
|
|
LiveInRegs.clear();
|
|
|
|
LiveOutRegs.clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Clear the result so it can be used for another round of pressure tracking.
|
|
|
|
void RegionPressure::reset() {
|
|
|
|
TopPos = BottomPos = MachineBasicBlock::const_iterator();
|
|
|
|
MaxSetPressure.clear();
|
|
|
|
LiveInRegs.clear();
|
|
|
|
LiveOutRegs.clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
/// If the current top is not less than or equal to the next index, open it.
|
|
|
|
/// We happen to need the SlotIndex for the next top for pressure update.
|
|
|
|
void IntervalPressure::openTop(SlotIndex NextTop) {
|
|
|
|
if (TopIdx <= NextTop)
|
|
|
|
return;
|
|
|
|
TopIdx = SlotIndex();
|
|
|
|
LiveInRegs.clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
/// If the current top is the previous instruction (before receding), open it.
|
|
|
|
void RegionPressure::openTop(MachineBasicBlock::const_iterator PrevTop) {
|
|
|
|
if (TopPos != PrevTop)
|
|
|
|
return;
|
|
|
|
TopPos = MachineBasicBlock::const_iterator();
|
|
|
|
LiveInRegs.clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
/// If the current bottom is not greater than the previous index, open it.
|
|
|
|
void IntervalPressure::openBottom(SlotIndex PrevBottom) {
|
|
|
|
if (BottomIdx > PrevBottom)
|
|
|
|
return;
|
|
|
|
BottomIdx = SlotIndex();
|
|
|
|
LiveInRegs.clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
/// If the current bottom is the previous instr (before advancing), open it.
|
|
|
|
void RegionPressure::openBottom(MachineBasicBlock::const_iterator PrevBottom) {
|
|
|
|
if (BottomPos != PrevBottom)
|
|
|
|
return;
|
|
|
|
BottomPos = MachineBasicBlock::const_iterator();
|
|
|
|
LiveInRegs.clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Setup the RegPressureTracker.
|
|
|
|
///
|
|
|
|
/// TODO: Add support for pressure without LiveIntervals.
|
|
|
|
void RegPressureTracker::init(const MachineFunction *mf,
|
|
|
|
const RegisterClassInfo *rci,
|
|
|
|
const LiveIntervals *lis,
|
|
|
|
const MachineBasicBlock *mbb,
|
|
|
|
MachineBasicBlock::const_iterator pos)
|
|
|
|
{
|
|
|
|
MF = mf;
|
|
|
|
TRI = MF->getTarget().getRegisterInfo();
|
|
|
|
RCI = rci;
|
|
|
|
MRI = &MF->getRegInfo();
|
|
|
|
MBB = mbb;
|
|
|
|
|
|
|
|
if (RequireIntervals) {
|
|
|
|
assert(lis && "IntervalPressure requires LiveIntervals");
|
|
|
|
LIS = lis;
|
|
|
|
}
|
|
|
|
|
|
|
|
CurrPos = pos;
|
|
|
|
while (CurrPos != MBB->end() && CurrPos->isDebugValue())
|
|
|
|
++CurrPos;
|
|
|
|
|
|
|
|
CurrSetPressure.assign(TRI->getNumRegPressureSets(), 0);
|
|
|
|
|
|
|
|
if (RequireIntervals)
|
|
|
|
static_cast<IntervalPressure&>(P).reset();
|
|
|
|
else
|
|
|
|
static_cast<RegionPressure&>(P).reset();
|
|
|
|
P.MaxSetPressure = CurrSetPressure;
|
|
|
|
|
|
|
|
LivePhysRegs.clear();
|
|
|
|
LivePhysRegs.setUniverse(TRI->getNumRegs());
|
|
|
|
LiveVirtRegs.clear();
|
|
|
|
LiveVirtRegs.setUniverse(MRI->getNumVirtRegs());
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Does this pressure result have a valid top position and live ins.
|
|
|
|
bool RegPressureTracker::isTopClosed() const {
|
|
|
|
if (RequireIntervals)
|
|
|
|
return static_cast<IntervalPressure&>(P).TopIdx.isValid();
|
|
|
|
return (static_cast<RegionPressure&>(P).TopPos ==
|
|
|
|
MachineBasicBlock::const_iterator());
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Does this pressure result have a valid bottom position and live outs.
|
|
|
|
bool RegPressureTracker::isBottomClosed() const {
|
|
|
|
if (RequireIntervals)
|
|
|
|
return static_cast<IntervalPressure&>(P).BottomIdx.isValid();
|
|
|
|
return (static_cast<RegionPressure&>(P).BottomPos ==
|
|
|
|
MachineBasicBlock::const_iterator());
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Set the boundary for the top of the region and summarize live ins.
|
|
|
|
void RegPressureTracker::closeTop() {
|
|
|
|
if (RequireIntervals)
|
|
|
|
static_cast<IntervalPressure&>(P).TopIdx =
|
|
|
|
LIS->getInstructionIndex(CurrPos).getRegSlot();
|
|
|
|
else
|
|
|
|
static_cast<RegionPressure&>(P).TopPos = CurrPos;
|
|
|
|
|
|
|
|
assert(P.LiveInRegs.empty() && "inconsistent max pressure result");
|
|
|
|
P.LiveInRegs.reserve(LivePhysRegs.size() + LiveVirtRegs.size());
|
|
|
|
P.LiveInRegs.append(LivePhysRegs.begin(), LivePhysRegs.end());
|
|
|
|
for (SparseSet<unsigned>::const_iterator I =
|
|
|
|
LiveVirtRegs.begin(), E = LiveVirtRegs.end(); I != E; ++I)
|
|
|
|
P.LiveInRegs.push_back(*I);
|
|
|
|
std::sort(P.LiveInRegs.begin(), P.LiveInRegs.end());
|
|
|
|
P.LiveInRegs.erase(std::unique(P.LiveInRegs.begin(), P.LiveInRegs.end()),
|
|
|
|
P.LiveInRegs.end());
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Set the boundary for the bottom of the region and summarize live outs.
|
|
|
|
void RegPressureTracker::closeBottom() {
|
|
|
|
if (RequireIntervals)
|
|
|
|
if (CurrPos == MBB->end())
|
|
|
|
static_cast<IntervalPressure&>(P).BottomIdx = LIS->getMBBEndIdx(MBB);
|
|
|
|
else
|
|
|
|
static_cast<IntervalPressure&>(P).BottomIdx =
|
|
|
|
LIS->getInstructionIndex(CurrPos).getRegSlot();
|
|
|
|
else
|
|
|
|
static_cast<RegionPressure&>(P).BottomPos = CurrPos;
|
|
|
|
|
|
|
|
assert(P.LiveOutRegs.empty() && "inconsistent max pressure result");
|
|
|
|
P.LiveOutRegs.reserve(LivePhysRegs.size() + LiveVirtRegs.size());
|
|
|
|
P.LiveOutRegs.append(LivePhysRegs.begin(), LivePhysRegs.end());
|
|
|
|
for (SparseSet<unsigned>::const_iterator I =
|
|
|
|
LiveVirtRegs.begin(), E = LiveVirtRegs.end(); I != E; ++I)
|
|
|
|
P.LiveOutRegs.push_back(*I);
|
|
|
|
std::sort(P.LiveOutRegs.begin(), P.LiveOutRegs.end());
|
|
|
|
P.LiveOutRegs.erase(std::unique(P.LiveOutRegs.begin(), P.LiveOutRegs.end()),
|
|
|
|
P.LiveOutRegs.end());
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Finalize the region boundaries and record live ins and live outs.
|
|
|
|
void RegPressureTracker::closeRegion() {
|
|
|
|
if (!isTopClosed() && !isBottomClosed()) {
|
|
|
|
assert(LivePhysRegs.empty() && LiveVirtRegs.empty() &&
|
|
|
|
"no region boundary");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (!isBottomClosed())
|
|
|
|
closeBottom();
|
|
|
|
else if (!isTopClosed())
|
|
|
|
closeTop();
|
|
|
|
// If both top and bottom are closed, do nothing.
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Return true if Reg aliases a register in Regs SparseSet.
|
|
|
|
static bool hasRegAlias(unsigned Reg, SparseSet<unsigned> &Regs,
|
|
|
|
const TargetRegisterInfo *TRI) {
|
|
|
|
assert(!TargetRegisterInfo::isVirtualRegister(Reg) && "only for physregs");
|
|
|
|
for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
|
|
|
|
if (Regs.count(*AI))
|
|
|
|
return true;
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Return true if Reg aliases a register in unsorted Regs SmallVector.
|
|
|
|
/// This is only valid for physical registers.
|
|
|
|
static SmallVectorImpl<unsigned>::iterator
|
|
|
|
findRegAlias(unsigned Reg, SmallVectorImpl<unsigned> &Regs,
|
|
|
|
const TargetRegisterInfo *TRI) {
|
|
|
|
for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) {
|
|
|
|
SmallVectorImpl<unsigned>::iterator I =
|
|
|
|
std::find(Regs.begin(), Regs.end(), *AI);
|
|
|
|
if (I != Regs.end())
|
|
|
|
return I;
|
|
|
|
}
|
|
|
|
return Regs.end();
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Return true if Reg can be inserted into Regs SmallVector. For virtual
|
|
|
|
/// register, do a linear search. For physical registers check for aliases.
|
|
|
|
static SmallVectorImpl<unsigned>::iterator
|
|
|
|
findReg(unsigned Reg, bool isVReg, SmallVectorImpl<unsigned> &Regs,
|
|
|
|
const TargetRegisterInfo *TRI) {
|
|
|
|
if(isVReg)
|
|
|
|
return std::find(Regs.begin(), Regs.end(), Reg);
|
|
|
|
return findRegAlias(Reg, Regs, TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Collect this instruction's unique uses and defs into SmallVectors for
|
|
|
|
/// processing defs and uses in order.
|
|
|
|
template<bool isVReg>
|
|
|
|
struct RegisterOperands {
|
|
|
|
SmallVector<unsigned, 8> Uses;
|
|
|
|
SmallVector<unsigned, 8> Defs;
|
|
|
|
SmallVector<unsigned, 8> DeadDefs;
|
|
|
|
|
|
|
|
/// Push this operand's register onto the correct vector.
|
|
|
|
void collect(const MachineOperand &MO, const TargetRegisterInfo *TRI) {
|
|
|
|
if (MO.readsReg()) {
|
|
|
|
if (findReg(MO.getReg(), isVReg, Uses, TRI) == Uses.end())
|
|
|
|
Uses.push_back(MO.getReg());
|
|
|
|
}
|
|
|
|
if (MO.isDef()) {
|
|
|
|
if (MO.isDead()) {
|
|
|
|
if (findReg(MO.getReg(), isVReg, DeadDefs, TRI) == DeadDefs.end())
|
|
|
|
DeadDefs.push_back(MO.getReg());
|
|
|
|
}
|
2012-12-02 13:10:19 +00:00
|
|
|
else if (findReg(MO.getReg(), isVReg, Defs, TRI) == Defs.end())
|
|
|
|
Defs.push_back(MO.getReg());
|
2012-08-15 19:34:23 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
};
|
|
|
|
typedef RegisterOperands<false> PhysRegOperands;
|
|
|
|
typedef RegisterOperands<true> VirtRegOperands;
|
|
|
|
|
|
|
|
/// Collect physical and virtual register operands.
|
|
|
|
static void collectOperands(const MachineInstr *MI,
|
|
|
|
PhysRegOperands &PhysRegOpers,
|
|
|
|
VirtRegOperands &VirtRegOpers,
|
|
|
|
const TargetRegisterInfo *TRI,
|
2012-12-02 13:10:19 +00:00
|
|
|
const MachineRegisterInfo *MRI) {
|
2012-08-15 19:34:23 +00:00
|
|
|
for(ConstMIBundleOperands OperI(MI); OperI.isValid(); ++OperI) {
|
|
|
|
const MachineOperand &MO = *OperI;
|
|
|
|
if (!MO.isReg() || !MO.getReg())
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (TargetRegisterInfo::isVirtualRegister(MO.getReg()))
|
|
|
|
VirtRegOpers.collect(MO, TRI);
|
2012-12-02 13:10:19 +00:00
|
|
|
else if (MRI->isAllocatable(MO.getReg()))
|
2012-08-15 19:34:23 +00:00
|
|
|
PhysRegOpers.collect(MO, TRI);
|
|
|
|
}
|
|
|
|
// Remove redundant physreg dead defs.
|
|
|
|
for (unsigned i = PhysRegOpers.DeadDefs.size(); i > 0; --i) {
|
|
|
|
unsigned Reg = PhysRegOpers.DeadDefs[i-1];
|
|
|
|
if (findRegAlias(Reg, PhysRegOpers.Defs, TRI) != PhysRegOpers.Defs.end())
|
|
|
|
PhysRegOpers.DeadDefs.erase(&PhysRegOpers.DeadDefs[i-1]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Force liveness of registers.
|
|
|
|
void RegPressureTracker::addLiveRegs(ArrayRef<unsigned> Regs) {
|
|
|
|
for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
|
|
|
|
if (TargetRegisterInfo::isVirtualRegister(Regs[i])) {
|
|
|
|
if (LiveVirtRegs.insert(Regs[i]).second)
|
|
|
|
increaseVirtRegPressure(Regs[i]);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
if (!hasRegAlias(Regs[i], LivePhysRegs, TRI)) {
|
|
|
|
LivePhysRegs.insert(Regs[i]);
|
|
|
|
increasePhysRegPressure(Regs[i]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Add PhysReg to the live in set and increase max pressure.
|
|
|
|
void RegPressureTracker::discoverPhysLiveIn(unsigned Reg) {
|
|
|
|
assert(!LivePhysRegs.count(Reg) && "avoid bumping max pressure twice");
|
|
|
|
if (findRegAlias(Reg, P.LiveInRegs, TRI) != P.LiveInRegs.end())
|
|
|
|
return;
|
|
|
|
|
|
|
|
// At live in discovery, unconditionally increase the high water mark.
|
|
|
|
P.LiveInRegs.push_back(Reg);
|
|
|
|
P.increase(TRI->getMinimalPhysRegClass(Reg), TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Add PhysReg to the live out set and increase max pressure.
|
|
|
|
void RegPressureTracker::discoverPhysLiveOut(unsigned Reg) {
|
|
|
|
assert(!LivePhysRegs.count(Reg) && "avoid bumping max pressure twice");
|
|
|
|
if (findRegAlias(Reg, P.LiveOutRegs, TRI) != P.LiveOutRegs.end())
|
|
|
|
return;
|
|
|
|
|
|
|
|
// At live out discovery, unconditionally increase the high water mark.
|
|
|
|
P.LiveOutRegs.push_back(Reg);
|
|
|
|
P.increase(TRI->getMinimalPhysRegClass(Reg), TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Add VirtReg to the live in set and increase max pressure.
|
|
|
|
void RegPressureTracker::discoverVirtLiveIn(unsigned Reg) {
|
|
|
|
assert(!LiveVirtRegs.count(Reg) && "avoid bumping max pressure twice");
|
|
|
|
if (std::find(P.LiveInRegs.begin(), P.LiveInRegs.end(), Reg) !=
|
|
|
|
P.LiveInRegs.end())
|
|
|
|
return;
|
|
|
|
|
|
|
|
// At live in discovery, unconditionally increase the high water mark.
|
|
|
|
P.LiveInRegs.push_back(Reg);
|
|
|
|
P.increase(MRI->getRegClass(Reg), TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Add VirtReg to the live out set and increase max pressure.
|
|
|
|
void RegPressureTracker::discoverVirtLiveOut(unsigned Reg) {
|
|
|
|
assert(!LiveVirtRegs.count(Reg) && "avoid bumping max pressure twice");
|
|
|
|
if (std::find(P.LiveOutRegs.begin(), P.LiveOutRegs.end(), Reg) !=
|
|
|
|
P.LiveOutRegs.end())
|
|
|
|
return;
|
|
|
|
|
|
|
|
// At live out discovery, unconditionally increase the high water mark.
|
|
|
|
P.LiveOutRegs.push_back(Reg);
|
|
|
|
P.increase(MRI->getRegClass(Reg), TRI);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Recede across the previous instruction.
|
|
|
|
bool RegPressureTracker::recede() {
|
|
|
|
// Check for the top of the analyzable region.
|
|
|
|
if (CurrPos == MBB->begin()) {
|
|
|
|
closeRegion();
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
if (!isBottomClosed())
|
|
|
|
closeBottom();
|
|
|
|
|
|
|
|
// Open the top of the region using block iterators.
|
|
|
|
if (!RequireIntervals && isTopClosed())
|
|
|
|
static_cast<RegionPressure&>(P).openTop(CurrPos);
|
|
|
|
|
|
|
|
// Find the previous instruction.
|
|
|
|
do
|
|
|
|
--CurrPos;
|
|
|
|
while (CurrPos != MBB->begin() && CurrPos->isDebugValue());
|
|
|
|
|
|
|
|
if (CurrPos->isDebugValue()) {
|
|
|
|
closeRegion();
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
SlotIndex SlotIdx;
|
|
|
|
if (RequireIntervals)
|
|
|
|
SlotIdx = LIS->getInstructionIndex(CurrPos).getRegSlot();
|
|
|
|
|
|
|
|
// Open the top of the region using slot indexes.
|
|
|
|
if (RequireIntervals && isTopClosed())
|
|
|
|
static_cast<IntervalPressure&>(P).openTop(SlotIdx);
|
|
|
|
|
|
|
|
PhysRegOperands PhysRegOpers;
|
|
|
|
VirtRegOperands VirtRegOpers;
|
2012-12-02 13:10:19 +00:00
|
|
|
collectOperands(CurrPos, PhysRegOpers, VirtRegOpers, TRI, MRI);
|
2012-08-15 19:34:23 +00:00
|
|
|
|
|
|
|
// Boost pressure for all dead defs together.
|
|
|
|
increasePhysRegPressure(PhysRegOpers.DeadDefs);
|
|
|
|
increaseVirtRegPressure(VirtRegOpers.DeadDefs);
|
|
|
|
decreasePhysRegPressure(PhysRegOpers.DeadDefs);
|
|
|
|
decreaseVirtRegPressure(VirtRegOpers.DeadDefs);
|
|
|
|
|
|
|
|
// Kill liveness at live defs.
|
|
|
|
// TODO: consider earlyclobbers?
|
|
|
|
for (unsigned i = 0, e = PhysRegOpers.Defs.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = PhysRegOpers.Defs[i];
|
|
|
|
if (LivePhysRegs.erase(Reg))
|
|
|
|
decreasePhysRegPressure(Reg);
|
|
|
|
else
|
|
|
|
discoverPhysLiveOut(Reg);
|
|
|
|
}
|
|
|
|
for (unsigned i = 0, e = VirtRegOpers.Defs.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = VirtRegOpers.Defs[i];
|
|
|
|
if (LiveVirtRegs.erase(Reg))
|
|
|
|
decreaseVirtRegPressure(Reg);
|
|
|
|
else
|
|
|
|
discoverVirtLiveOut(Reg);
|
|
|
|
}
|
|
|
|
|
|
|
|
// Generate liveness for uses.
|
|
|
|
for (unsigned i = 0, e = PhysRegOpers.Uses.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = PhysRegOpers.Uses[i];
|
|
|
|
if (!hasRegAlias(Reg, LivePhysRegs, TRI)) {
|
|
|
|
increasePhysRegPressure(Reg);
|
|
|
|
LivePhysRegs.insert(Reg);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for (unsigned i = 0, e = VirtRegOpers.Uses.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = VirtRegOpers.Uses[i];
|
|
|
|
if (!LiveVirtRegs.count(Reg)) {
|
|
|
|
// Adjust liveouts if LiveIntervals are available.
|
|
|
|
if (RequireIntervals) {
|
|
|
|
const LiveInterval *LI = &LIS->getInterval(Reg);
|
|
|
|
if (!LI->killedAt(SlotIdx))
|
|
|
|
discoverVirtLiveOut(Reg);
|
|
|
|
}
|
|
|
|
increaseVirtRegPressure(Reg);
|
|
|
|
LiveVirtRegs.insert(Reg);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Advance across the current instruction.
|
|
|
|
bool RegPressureTracker::advance() {
|
|
|
|
// Check for the bottom of the analyzable region.
|
|
|
|
if (CurrPos == MBB->end()) {
|
|
|
|
closeRegion();
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
if (!isTopClosed())
|
|
|
|
closeTop();
|
|
|
|
|
|
|
|
SlotIndex SlotIdx;
|
|
|
|
if (RequireIntervals)
|
|
|
|
SlotIdx = LIS->getInstructionIndex(CurrPos).getRegSlot();
|
|
|
|
|
|
|
|
// Open the bottom of the region using slot indexes.
|
|
|
|
if (isBottomClosed()) {
|
|
|
|
if (RequireIntervals)
|
|
|
|
static_cast<IntervalPressure&>(P).openBottom(SlotIdx);
|
|
|
|
else
|
|
|
|
static_cast<RegionPressure&>(P).openBottom(CurrPos);
|
|
|
|
}
|
|
|
|
|
|
|
|
PhysRegOperands PhysRegOpers;
|
|
|
|
VirtRegOperands VirtRegOpers;
|
2012-12-02 13:10:19 +00:00
|
|
|
collectOperands(CurrPos, PhysRegOpers, VirtRegOpers, TRI, MRI);
|
2012-08-15 19:34:23 +00:00
|
|
|
|
|
|
|
// Kill liveness at last uses.
|
|
|
|
for (unsigned i = 0, e = PhysRegOpers.Uses.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = PhysRegOpers.Uses[i];
|
|
|
|
if (!hasRegAlias(Reg, LivePhysRegs, TRI))
|
|
|
|
discoverPhysLiveIn(Reg);
|
|
|
|
else {
|
|
|
|
// Allocatable physregs are always single-use before regalloc.
|
|
|
|
decreasePhysRegPressure(Reg);
|
|
|
|
LivePhysRegs.erase(Reg);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for (unsigned i = 0, e = VirtRegOpers.Uses.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = VirtRegOpers.Uses[i];
|
|
|
|
if (RequireIntervals) {
|
|
|
|
const LiveInterval *LI = &LIS->getInterval(Reg);
|
|
|
|
if (LI->killedAt(SlotIdx)) {
|
|
|
|
if (LiveVirtRegs.erase(Reg))
|
|
|
|
decreaseVirtRegPressure(Reg);
|
|
|
|
else
|
|
|
|
discoverVirtLiveIn(Reg);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else if (!LiveVirtRegs.count(Reg)) {
|
|
|
|
discoverVirtLiveIn(Reg);
|
|
|
|
increaseVirtRegPressure(Reg);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Generate liveness for defs.
|
|
|
|
for (unsigned i = 0, e = PhysRegOpers.Defs.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = PhysRegOpers.Defs[i];
|
|
|
|
if (!hasRegAlias(Reg, LivePhysRegs, TRI)) {
|
|
|
|
increasePhysRegPressure(Reg);
|
|
|
|
LivePhysRegs.insert(Reg);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for (unsigned i = 0, e = VirtRegOpers.Defs.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = VirtRegOpers.Defs[i];
|
|
|
|
if (LiveVirtRegs.insert(Reg).second)
|
|
|
|
increaseVirtRegPressure(Reg);
|
|
|
|
}
|
|
|
|
|
|
|
|
// Boost pressure for all dead defs together.
|
|
|
|
increasePhysRegPressure(PhysRegOpers.DeadDefs);
|
|
|
|
increaseVirtRegPressure(VirtRegOpers.DeadDefs);
|
|
|
|
decreasePhysRegPressure(PhysRegOpers.DeadDefs);
|
|
|
|
decreaseVirtRegPressure(VirtRegOpers.DeadDefs);
|
|
|
|
|
|
|
|
// Find the next instruction.
|
|
|
|
do
|
|
|
|
++CurrPos;
|
|
|
|
while (CurrPos != MBB->end() && CurrPos->isDebugValue());
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Find the max change in excess pressure across all sets.
|
|
|
|
static void computeExcessPressureDelta(ArrayRef<unsigned> OldPressureVec,
|
|
|
|
ArrayRef<unsigned> NewPressureVec,
|
|
|
|
RegPressureDelta &Delta,
|
|
|
|
const TargetRegisterInfo *TRI) {
|
|
|
|
int ExcessUnits = 0;
|
|
|
|
unsigned PSetID = ~0U;
|
|
|
|
for (unsigned i = 0, e = OldPressureVec.size(); i < e; ++i) {
|
|
|
|
unsigned POld = OldPressureVec[i];
|
|
|
|
unsigned PNew = NewPressureVec[i];
|
|
|
|
int PDiff = (int)PNew - (int)POld;
|
|
|
|
if (!PDiff) // No change in this set in the common case.
|
|
|
|
continue;
|
|
|
|
// Only consider change beyond the limit.
|
|
|
|
unsigned Limit = TRI->getRegPressureSetLimit(i);
|
|
|
|
if (Limit > POld) {
|
|
|
|
if (Limit > PNew)
|
|
|
|
PDiff = 0; // Under the limit
|
|
|
|
else
|
|
|
|
PDiff = PNew - Limit; // Just exceeded limit.
|
|
|
|
}
|
|
|
|
else if (Limit > PNew)
|
|
|
|
PDiff = Limit - POld; // Just obeyed limit.
|
|
|
|
|
|
|
|
if (std::abs(PDiff) > std::abs(ExcessUnits)) {
|
|
|
|
ExcessUnits = PDiff;
|
|
|
|
PSetID = i;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
Delta.Excess.PSetID = PSetID;
|
|
|
|
Delta.Excess.UnitIncrease = ExcessUnits;
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Find the max change in max pressure that either surpasses a critical PSet
|
|
|
|
/// limit or exceeds the current MaxPressureLimit.
|
|
|
|
///
|
|
|
|
/// FIXME: comparing each element of the old and new MaxPressure vectors here is
|
|
|
|
/// silly. It's done now to demonstrate the concept but will go away with a
|
|
|
|
/// RegPressureTracker API change to work with pressure differences.
|
|
|
|
static void computeMaxPressureDelta(ArrayRef<unsigned> OldMaxPressureVec,
|
|
|
|
ArrayRef<unsigned> NewMaxPressureVec,
|
|
|
|
ArrayRef<PressureElement> CriticalPSets,
|
|
|
|
ArrayRef<unsigned> MaxPressureLimit,
|
|
|
|
RegPressureDelta &Delta) {
|
|
|
|
Delta.CriticalMax = PressureElement();
|
|
|
|
Delta.CurrentMax = PressureElement();
|
|
|
|
|
|
|
|
unsigned CritIdx = 0, CritEnd = CriticalPSets.size();
|
|
|
|
for (unsigned i = 0, e = OldMaxPressureVec.size(); i < e; ++i) {
|
|
|
|
unsigned POld = OldMaxPressureVec[i];
|
|
|
|
unsigned PNew = NewMaxPressureVec[i];
|
|
|
|
if (PNew == POld) // No change in this set in the common case.
|
|
|
|
continue;
|
|
|
|
|
|
|
|
while (CritIdx != CritEnd && CriticalPSets[CritIdx].PSetID < i)
|
|
|
|
++CritIdx;
|
|
|
|
|
|
|
|
if (CritIdx != CritEnd && CriticalPSets[CritIdx].PSetID == i) {
|
|
|
|
int PDiff = (int)PNew - (int)CriticalPSets[CritIdx].UnitIncrease;
|
|
|
|
if (PDiff > Delta.CriticalMax.UnitIncrease) {
|
|
|
|
Delta.CriticalMax.PSetID = i;
|
|
|
|
Delta.CriticalMax.UnitIncrease = PDiff;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Find the greatest increase above MaxPressureLimit.
|
|
|
|
// (Ignores negative MDiff).
|
|
|
|
int MDiff = (int)PNew - (int)MaxPressureLimit[i];
|
|
|
|
if (MDiff > Delta.CurrentMax.UnitIncrease) {
|
|
|
|
Delta.CurrentMax.PSetID = i;
|
|
|
|
Delta.CurrentMax.UnitIncrease = PNew;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Record the upward impact of a single instruction on current register
|
|
|
|
/// pressure. Unlike the advance/recede pressure tracking interface, this does
|
|
|
|
/// not discover live in/outs.
|
|
|
|
///
|
|
|
|
/// This is intended for speculative queries. It leaves pressure inconsistent
|
|
|
|
/// with the current position, so must be restored by the caller.
|
|
|
|
void RegPressureTracker::bumpUpwardPressure(const MachineInstr *MI) {
|
|
|
|
// Account for register pressure similar to RegPressureTracker::recede().
|
|
|
|
PhysRegOperands PhysRegOpers;
|
|
|
|
VirtRegOperands VirtRegOpers;
|
2012-12-02 13:10:19 +00:00
|
|
|
collectOperands(MI, PhysRegOpers, VirtRegOpers, TRI, MRI);
|
2012-08-15 19:34:23 +00:00
|
|
|
|
|
|
|
// Boost max pressure for all dead defs together.
|
|
|
|
// Since CurrSetPressure and MaxSetPressure
|
|
|
|
increasePhysRegPressure(PhysRegOpers.DeadDefs);
|
|
|
|
increaseVirtRegPressure(VirtRegOpers.DeadDefs);
|
|
|
|
decreasePhysRegPressure(PhysRegOpers.DeadDefs);
|
|
|
|
decreaseVirtRegPressure(VirtRegOpers.DeadDefs);
|
|
|
|
|
|
|
|
// Kill liveness at live defs.
|
2012-12-02 13:10:19 +00:00
|
|
|
for (unsigned i = 0, e = PhysRegOpers.Defs.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = PhysRegOpers.Defs[i];
|
|
|
|
if (!findReg(Reg, false, PhysRegOpers.Uses, TRI))
|
|
|
|
decreasePhysRegPressure(PhysRegOpers.Defs);
|
|
|
|
}
|
|
|
|
for (unsigned i = 0, e = VirtRegOpers.Defs.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = VirtRegOpers.Defs[i];
|
|
|
|
if (!findReg(Reg, true, VirtRegOpers.Uses, TRI))
|
|
|
|
decreaseVirtRegPressure(VirtRegOpers.Defs);
|
|
|
|
}
|
2012-08-15 19:34:23 +00:00
|
|
|
// Generate liveness for uses.
|
|
|
|
for (unsigned i = 0, e = PhysRegOpers.Uses.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = PhysRegOpers.Uses[i];
|
|
|
|
if (!hasRegAlias(Reg, LivePhysRegs, TRI))
|
|
|
|
increasePhysRegPressure(Reg);
|
|
|
|
}
|
|
|
|
for (unsigned i = 0, e = VirtRegOpers.Uses.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = VirtRegOpers.Uses[i];
|
|
|
|
if (!LiveVirtRegs.count(Reg))
|
|
|
|
increaseVirtRegPressure(Reg);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Consider the pressure increase caused by traversing this instruction
|
|
|
|
/// bottom-up. Find the pressure set with the most change beyond its pressure
|
|
|
|
/// limit based on the tracker's current pressure, and return the change in
|
|
|
|
/// number of register units of that pressure set introduced by this
|
|
|
|
/// instruction.
|
|
|
|
///
|
|
|
|
/// This assumes that the current LiveOut set is sufficient.
|
|
|
|
///
|
|
|
|
/// FIXME: This is expensive for an on-the-fly query. We need to cache the
|
|
|
|
/// result per-SUnit with enough information to adjust for the current
|
|
|
|
/// scheduling position. But this works as a proof of concept.
|
|
|
|
void RegPressureTracker::
|
|
|
|
getMaxUpwardPressureDelta(const MachineInstr *MI, RegPressureDelta &Delta,
|
|
|
|
ArrayRef<PressureElement> CriticalPSets,
|
|
|
|
ArrayRef<unsigned> MaxPressureLimit) {
|
|
|
|
// Snapshot Pressure.
|
|
|
|
// FIXME: The snapshot heap space should persist. But I'm planning to
|
|
|
|
// summarize the pressure effect so we don't need to snapshot at all.
|
|
|
|
std::vector<unsigned> SavedPressure = CurrSetPressure;
|
|
|
|
std::vector<unsigned> SavedMaxPressure = P.MaxSetPressure;
|
|
|
|
|
|
|
|
bumpUpwardPressure(MI);
|
|
|
|
|
|
|
|
computeExcessPressureDelta(SavedPressure, CurrSetPressure, Delta, TRI);
|
|
|
|
computeMaxPressureDelta(SavedMaxPressure, P.MaxSetPressure, CriticalPSets,
|
|
|
|
MaxPressureLimit, Delta);
|
|
|
|
assert(Delta.CriticalMax.UnitIncrease >= 0 &&
|
|
|
|
Delta.CurrentMax.UnitIncrease >= 0 && "cannot decrease max pressure");
|
|
|
|
|
|
|
|
// Restore the tracker's state.
|
|
|
|
P.MaxSetPressure.swap(SavedMaxPressure);
|
|
|
|
CurrSetPressure.swap(SavedPressure);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Helper to find a vreg use between two indices [PriorUseIdx, NextUseIdx).
|
|
|
|
static bool findUseBetween(unsigned Reg,
|
|
|
|
SlotIndex PriorUseIdx, SlotIndex NextUseIdx,
|
|
|
|
const MachineRegisterInfo *MRI,
|
|
|
|
const LiveIntervals *LIS) {
|
|
|
|
for (MachineRegisterInfo::use_nodbg_iterator
|
|
|
|
UI = MRI->use_nodbg_begin(Reg), UE = MRI->use_nodbg_end();
|
|
|
|
UI != UE; UI.skipInstruction()) {
|
|
|
|
const MachineInstr* MI = &*UI;
|
|
|
|
SlotIndex InstSlot = LIS->getInstructionIndex(MI).getRegSlot();
|
|
|
|
if (InstSlot >= PriorUseIdx && InstSlot < NextUseIdx)
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Record the downward impact of a single instruction on current register
|
|
|
|
/// pressure. Unlike the advance/recede pressure tracking interface, this does
|
|
|
|
/// not discover live in/outs.
|
|
|
|
///
|
|
|
|
/// This is intended for speculative queries. It leaves pressure inconsistent
|
|
|
|
/// with the current position, so must be restored by the caller.
|
|
|
|
void RegPressureTracker::bumpDownwardPressure(const MachineInstr *MI) {
|
|
|
|
// Account for register pressure similar to RegPressureTracker::recede().
|
|
|
|
PhysRegOperands PhysRegOpers;
|
|
|
|
VirtRegOperands VirtRegOpers;
|
2012-12-02 13:10:19 +00:00
|
|
|
collectOperands(MI, PhysRegOpers, VirtRegOpers, TRI, MRI);
|
2012-08-15 19:34:23 +00:00
|
|
|
|
|
|
|
// Kill liveness at last uses. Assume allocatable physregs are single-use
|
|
|
|
// rather than checking LiveIntervals.
|
|
|
|
decreasePhysRegPressure(PhysRegOpers.Uses);
|
|
|
|
if (RequireIntervals) {
|
|
|
|
SlotIndex SlotIdx = LIS->getInstructionIndex(MI).getRegSlot();
|
|
|
|
for (unsigned i = 0, e = VirtRegOpers.Uses.size(); i < e; ++i) {
|
|
|
|
unsigned Reg = VirtRegOpers.Uses[i];
|
|
|
|
const LiveInterval *LI = &LIS->getInterval(Reg);
|
|
|
|
// FIXME: allow the caller to pass in the list of vreg uses that remain to
|
|
|
|
// be bottom-scheduled to avoid searching uses at each query.
|
|
|
|
SlotIndex CurrIdx = LIS->getInstructionIndex(CurrPos).getRegSlot();
|
|
|
|
if (LI->killedAt(SlotIdx)
|
|
|
|
&& !findUseBetween(Reg, CurrIdx, SlotIdx, MRI, LIS)) {
|
|
|
|
decreaseVirtRegPressure(Reg);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Generate liveness for defs.
|
|
|
|
increasePhysRegPressure(PhysRegOpers.Defs);
|
|
|
|
increaseVirtRegPressure(VirtRegOpers.Defs);
|
|
|
|
|
|
|
|
// Boost pressure for all dead defs together.
|
|
|
|
increasePhysRegPressure(PhysRegOpers.DeadDefs);
|
|
|
|
increaseVirtRegPressure(VirtRegOpers.DeadDefs);
|
|
|
|
decreasePhysRegPressure(PhysRegOpers.DeadDefs);
|
|
|
|
decreaseVirtRegPressure(VirtRegOpers.DeadDefs);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Consider the pressure increase caused by traversing this instruction
|
|
|
|
/// top-down. Find the register class with the most change in its pressure limit
|
|
|
|
/// based on the tracker's current pressure, and return the number of excess
|
|
|
|
/// register units of that pressure set introduced by this instruction.
|
|
|
|
///
|
|
|
|
/// This assumes that the current LiveIn set is sufficient.
|
|
|
|
void RegPressureTracker::
|
|
|
|
getMaxDownwardPressureDelta(const MachineInstr *MI, RegPressureDelta &Delta,
|
|
|
|
ArrayRef<PressureElement> CriticalPSets,
|
|
|
|
ArrayRef<unsigned> MaxPressureLimit) {
|
|
|
|
// Snapshot Pressure.
|
|
|
|
std::vector<unsigned> SavedPressure = CurrSetPressure;
|
|
|
|
std::vector<unsigned> SavedMaxPressure = P.MaxSetPressure;
|
|
|
|
|
|
|
|
bumpDownwardPressure(MI);
|
|
|
|
|
|
|
|
computeExcessPressureDelta(SavedPressure, CurrSetPressure, Delta, TRI);
|
|
|
|
computeMaxPressureDelta(SavedMaxPressure, P.MaxSetPressure, CriticalPSets,
|
|
|
|
MaxPressureLimit, Delta);
|
|
|
|
assert(Delta.CriticalMax.UnitIncrease >= 0 &&
|
|
|
|
Delta.CurrentMax.UnitIncrease >= 0 && "cannot decrease max pressure");
|
|
|
|
|
|
|
|
// Restore the tracker's state.
|
|
|
|
P.MaxSetPressure.swap(SavedMaxPressure);
|
|
|
|
CurrSetPressure.swap(SavedPressure);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Get the pressure of each PSet after traversing this instruction bottom-up.
|
|
|
|
void RegPressureTracker::
|
|
|
|
getUpwardPressure(const MachineInstr *MI,
|
|
|
|
std::vector<unsigned> &PressureResult,
|
|
|
|
std::vector<unsigned> &MaxPressureResult) {
|
|
|
|
// Snapshot pressure.
|
|
|
|
PressureResult = CurrSetPressure;
|
|
|
|
MaxPressureResult = P.MaxSetPressure;
|
|
|
|
|
|
|
|
bumpUpwardPressure(MI);
|
|
|
|
|
|
|
|
// Current pressure becomes the result. Restore current pressure.
|
|
|
|
P.MaxSetPressure.swap(MaxPressureResult);
|
|
|
|
CurrSetPressure.swap(PressureResult);
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Get the pressure of each PSet after traversing this instruction top-down.
|
|
|
|
void RegPressureTracker::
|
|
|
|
getDownwardPressure(const MachineInstr *MI,
|
|
|
|
std::vector<unsigned> &PressureResult,
|
|
|
|
std::vector<unsigned> &MaxPressureResult) {
|
|
|
|
// Snapshot pressure.
|
|
|
|
PressureResult = CurrSetPressure;
|
|
|
|
MaxPressureResult = P.MaxSetPressure;
|
|
|
|
|
|
|
|
bumpDownwardPressure(MI);
|
|
|
|
|
|
|
|
// Current pressure becomes the result. Restore current pressure.
|
|
|
|
P.MaxSetPressure.swap(MaxPressureResult);
|
|
|
|
CurrSetPressure.swap(PressureResult);
|
|
|
|
}
|