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The PowerPC floating point registers can represent both f32 and f64 via the two register classes F4RC and F8RC. F8RC is considered a subclass of F4RC to allow cross-class coalescing. This coalescing only affects whether registers are spilled as f32 or f64. Spill slots must be accessed with load/store instructions corresponding to the class of the spilled register. PPCInstrInfo::foldMemoryOperandImpl was looking at the instruction opcode which is wrong. X86 has similar floating point register classes, but doesn't try to fold memory operands, so there is no problem there. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97262 91177308-0d34-0410-b5e6-96231b3b80d8
285 lines
9.9 KiB
C++
285 lines
9.9 KiB
C++
//===-- llvm/CodeGen/VirtRegMap.cpp - Virtual Register Map ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the VirtRegMap class.
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//
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// It also contains implementations of the Spiller interface, which, given a
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// virtual register map and a machine function, eliminates all virtual
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// references by replacing them with physical register references - adding spill
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// code as necessary.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "virtregmap"
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#include "VirtRegMap.h"
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#include "llvm/Function.h"
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#include "llvm/CodeGen/LiveIntervalAnalysis.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/BitVector.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallSet.h"
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#include <algorithm>
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using namespace llvm;
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STATISTIC(NumSpills , "Number of register spills");
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//===----------------------------------------------------------------------===//
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// VirtRegMap implementation
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//===----------------------------------------------------------------------===//
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char VirtRegMap::ID = 0;
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static RegisterPass<VirtRegMap>
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X("virtregmap", "Virtual Register Map");
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bool VirtRegMap::runOnMachineFunction(MachineFunction &mf) {
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MRI = &mf.getRegInfo();
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TII = mf.getTarget().getInstrInfo();
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TRI = mf.getTarget().getRegisterInfo();
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MF = &mf;
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ReMatId = MAX_STACK_SLOT+1;
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LowSpillSlot = HighSpillSlot = NO_STACK_SLOT;
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Virt2PhysMap.clear();
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Virt2StackSlotMap.clear();
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Virt2ReMatIdMap.clear();
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Virt2SplitMap.clear();
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Virt2SplitKillMap.clear();
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ReMatMap.clear();
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ImplicitDefed.clear();
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SpillSlotToUsesMap.clear();
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MI2VirtMap.clear();
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SpillPt2VirtMap.clear();
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RestorePt2VirtMap.clear();
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EmergencySpillMap.clear();
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EmergencySpillSlots.clear();
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SpillSlotToUsesMap.resize(8);
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ImplicitDefed.resize(MF->getRegInfo().getLastVirtReg()+1-
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TargetRegisterInfo::FirstVirtualRegister);
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allocatableRCRegs.clear();
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for (TargetRegisterInfo::regclass_iterator I = TRI->regclass_begin(),
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E = TRI->regclass_end(); I != E; ++I)
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allocatableRCRegs.insert(std::make_pair(*I,
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TRI->getAllocatableSet(mf, *I)));
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grow();
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return false;
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}
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void VirtRegMap::grow() {
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unsigned LastVirtReg = MF->getRegInfo().getLastVirtReg();
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Virt2PhysMap.grow(LastVirtReg);
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Virt2StackSlotMap.grow(LastVirtReg);
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Virt2ReMatIdMap.grow(LastVirtReg);
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Virt2SplitMap.grow(LastVirtReg);
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Virt2SplitKillMap.grow(LastVirtReg);
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ReMatMap.grow(LastVirtReg);
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ImplicitDefed.resize(LastVirtReg-TargetRegisterInfo::FirstVirtualRegister+1);
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}
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unsigned VirtRegMap::getRegAllocPref(unsigned virtReg) {
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std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(virtReg);
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unsigned physReg = Hint.second;
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if (physReg &&
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TargetRegisterInfo::isVirtualRegister(physReg) && hasPhys(physReg))
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physReg = getPhys(physReg);
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if (Hint.first == 0)
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return (physReg && TargetRegisterInfo::isPhysicalRegister(physReg))
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? physReg : 0;
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return TRI->ResolveRegAllocHint(Hint.first, physReg, *MF);
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}
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int VirtRegMap::assignVirt2StackSlot(unsigned virtReg) {
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assert(TargetRegisterInfo::isVirtualRegister(virtReg));
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assert(Virt2StackSlotMap[virtReg] == NO_STACK_SLOT &&
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"attempt to assign stack slot to already spilled register");
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const TargetRegisterClass* RC = MF->getRegInfo().getRegClass(virtReg);
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int SS = MF->getFrameInfo()->CreateSpillStackObject(RC->getSize(),
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RC->getAlignment());
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if (LowSpillSlot == NO_STACK_SLOT)
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LowSpillSlot = SS;
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if (HighSpillSlot == NO_STACK_SLOT || SS > HighSpillSlot)
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HighSpillSlot = SS;
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unsigned Idx = SS-LowSpillSlot;
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while (Idx >= SpillSlotToUsesMap.size())
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SpillSlotToUsesMap.resize(SpillSlotToUsesMap.size()*2);
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Virt2StackSlotMap[virtReg] = SS;
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++NumSpills;
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return SS;
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}
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void VirtRegMap::assignVirt2StackSlot(unsigned virtReg, int SS) {
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assert(TargetRegisterInfo::isVirtualRegister(virtReg));
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assert(Virt2StackSlotMap[virtReg] == NO_STACK_SLOT &&
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"attempt to assign stack slot to already spilled register");
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assert((SS >= 0 ||
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(SS >= MF->getFrameInfo()->getObjectIndexBegin())) &&
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"illegal fixed frame index");
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Virt2StackSlotMap[virtReg] = SS;
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}
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int VirtRegMap::assignVirtReMatId(unsigned virtReg) {
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assert(TargetRegisterInfo::isVirtualRegister(virtReg));
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assert(Virt2ReMatIdMap[virtReg] == NO_STACK_SLOT &&
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"attempt to assign re-mat id to already spilled register");
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Virt2ReMatIdMap[virtReg] = ReMatId;
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return ReMatId++;
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}
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void VirtRegMap::assignVirtReMatId(unsigned virtReg, int id) {
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assert(TargetRegisterInfo::isVirtualRegister(virtReg));
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assert(Virt2ReMatIdMap[virtReg] == NO_STACK_SLOT &&
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"attempt to assign re-mat id to already spilled register");
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Virt2ReMatIdMap[virtReg] = id;
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}
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int VirtRegMap::getEmergencySpillSlot(const TargetRegisterClass *RC) {
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std::map<const TargetRegisterClass*, int>::iterator I =
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EmergencySpillSlots.find(RC);
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if (I != EmergencySpillSlots.end())
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return I->second;
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int SS = MF->getFrameInfo()->CreateSpillStackObject(RC->getSize(),
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RC->getAlignment());
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if (LowSpillSlot == NO_STACK_SLOT)
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LowSpillSlot = SS;
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if (HighSpillSlot == NO_STACK_SLOT || SS > HighSpillSlot)
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HighSpillSlot = SS;
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EmergencySpillSlots[RC] = SS;
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return SS;
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}
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void VirtRegMap::addSpillSlotUse(int FI, MachineInstr *MI) {
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if (!MF->getFrameInfo()->isFixedObjectIndex(FI)) {
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// If FI < LowSpillSlot, this stack reference was produced by
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// instruction selection and is not a spill
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if (FI >= LowSpillSlot) {
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assert(FI >= 0 && "Spill slot index should not be negative!");
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assert((unsigned)FI-LowSpillSlot < SpillSlotToUsesMap.size()
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&& "Invalid spill slot");
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SpillSlotToUsesMap[FI-LowSpillSlot].insert(MI);
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}
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}
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}
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void VirtRegMap::virtFolded(unsigned VirtReg, MachineInstr *OldMI,
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MachineInstr *NewMI, ModRef MRInfo) {
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// Move previous memory references folded to new instruction.
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MI2VirtMapTy::iterator IP = MI2VirtMap.lower_bound(NewMI);
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for (MI2VirtMapTy::iterator I = MI2VirtMap.lower_bound(OldMI),
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E = MI2VirtMap.end(); I != E && I->first == OldMI; ) {
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MI2VirtMap.insert(IP, std::make_pair(NewMI, I->second));
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MI2VirtMap.erase(I++);
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}
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// add new memory reference
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MI2VirtMap.insert(IP, std::make_pair(NewMI, std::make_pair(VirtReg, MRInfo)));
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}
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void VirtRegMap::virtFolded(unsigned VirtReg, MachineInstr *MI, ModRef MRInfo) {
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MI2VirtMapTy::iterator IP = MI2VirtMap.lower_bound(MI);
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MI2VirtMap.insert(IP, std::make_pair(MI, std::make_pair(VirtReg, MRInfo)));
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}
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void VirtRegMap::RemoveMachineInstrFromMaps(MachineInstr *MI) {
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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MachineOperand &MO = MI->getOperand(i);
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if (!MO.isFI())
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continue;
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int FI = MO.getIndex();
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if (MF->getFrameInfo()->isFixedObjectIndex(FI))
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continue;
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// This stack reference was produced by instruction selection and
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// is not a spill
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if (FI < LowSpillSlot)
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continue;
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assert((unsigned)FI-LowSpillSlot < SpillSlotToUsesMap.size()
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&& "Invalid spill slot");
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SpillSlotToUsesMap[FI-LowSpillSlot].erase(MI);
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}
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MI2VirtMap.erase(MI);
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SpillPt2VirtMap.erase(MI);
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RestorePt2VirtMap.erase(MI);
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EmergencySpillMap.erase(MI);
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}
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/// FindUnusedRegisters - Gather a list of allocatable registers that
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/// have not been allocated to any virtual register.
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bool VirtRegMap::FindUnusedRegisters(LiveIntervals* LIs) {
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unsigned NumRegs = TRI->getNumRegs();
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UnusedRegs.reset();
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UnusedRegs.resize(NumRegs);
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BitVector Used(NumRegs);
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for (unsigned i = TargetRegisterInfo::FirstVirtualRegister,
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e = MF->getRegInfo().getLastVirtReg(); i <= e; ++i)
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if (Virt2PhysMap[i] != (unsigned)VirtRegMap::NO_PHYS_REG)
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Used.set(Virt2PhysMap[i]);
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BitVector Allocatable = TRI->getAllocatableSet(*MF);
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bool AnyUnused = false;
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for (unsigned Reg = 1; Reg < NumRegs; ++Reg) {
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if (Allocatable[Reg] && !Used[Reg] && !LIs->hasInterval(Reg)) {
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bool ReallyUnused = true;
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for (const unsigned *AS = TRI->getAliasSet(Reg); *AS; ++AS) {
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if (Used[*AS] || LIs->hasInterval(*AS)) {
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ReallyUnused = false;
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break;
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}
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}
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if (ReallyUnused) {
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AnyUnused = true;
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UnusedRegs.set(Reg);
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}
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}
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}
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return AnyUnused;
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}
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void VirtRegMap::print(raw_ostream &OS, const Module* M) const {
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const TargetRegisterInfo* TRI = MF->getTarget().getRegisterInfo();
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const MachineRegisterInfo &MRI = MF->getRegInfo();
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OS << "********** REGISTER MAP **********\n";
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for (unsigned i = TargetRegisterInfo::FirstVirtualRegister,
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e = MF->getRegInfo().getLastVirtReg(); i <= e; ++i) {
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if (Virt2PhysMap[i] != (unsigned)VirtRegMap::NO_PHYS_REG)
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OS << "[reg" << i << " -> " << TRI->getName(Virt2PhysMap[i])
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<< "] " << MRI.getRegClass(i)->getName() << "\n";
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}
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for (unsigned i = TargetRegisterInfo::FirstVirtualRegister,
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e = MF->getRegInfo().getLastVirtReg(); i <= e; ++i)
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if (Virt2StackSlotMap[i] != VirtRegMap::NO_STACK_SLOT)
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OS << "[reg" << i << " -> fi#" << Virt2StackSlotMap[i]
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<< "] " << MRI.getRegClass(i)->getName() << "\n";
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OS << '\n';
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}
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void VirtRegMap::dump() const {
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print(dbgs());
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}
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