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llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
Dan Gohman 014278e6a1 Remove isImm(), isReg(), and friends, in favor of 
isImmediate(), isRegister(), and friends, to avoid confusion
about having two different names with the same meaning. I'm
not attached to the longer names, and would be ok with
changing to the shorter names if others prefer it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56189 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-13 17:58:21 +00:00

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//===- PPCInstrInfo.cpp - PowerPC32 Instruction Information -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the PowerPC implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "PPCInstrInfo.h"
#include "PPCInstrBuilder.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCPredicates.h"
#include "PPCGenInstrInfo.inc"
#include "PPCTargetMachine.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetAsmInfo.h"
using namespace llvm;
extern cl::opt<bool> EnablePPC32RS; // FIXME (64-bit): See PPCRegisterInfo.cpp.
extern cl::opt<bool> EnablePPC64RS; // FIXME (64-bit): See PPCRegisterInfo.cpp.
PPCInstrInfo::PPCInstrInfo(PPCTargetMachine &tm)
: TargetInstrInfoImpl(PPCInsts, array_lengthof(PPCInsts)), TM(tm),
RI(*TM.getSubtargetImpl(), *this) {}
/// getPointerRegClass - Return the register class to use to hold pointers.
/// This is used for addressing modes.
const TargetRegisterClass *PPCInstrInfo::getPointerRegClass() const {
if (TM.getSubtargetImpl()->isPPC64())
return &PPC::G8RCRegClass;
else
return &PPC::GPRCRegClass;
}
bool PPCInstrInfo::isMoveInstr(const MachineInstr& MI,
unsigned& sourceReg,
unsigned& destReg) const {
unsigned oc = MI.getOpcode();
if (oc == PPC::OR || oc == PPC::OR8 || oc == PPC::VOR ||
oc == PPC::OR4To8 || oc == PPC::OR8To4) { // or r1, r2, r2
assert(MI.getNumOperands() >= 3 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(1).isRegister() &&
MI.getOperand(2).isRegister() &&
"invalid PPC OR instruction!");
if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
sourceReg = MI.getOperand(1).getReg();
destReg = MI.getOperand(0).getReg();
return true;
}
} else if (oc == PPC::ADDI) { // addi r1, r2, 0
assert(MI.getNumOperands() >= 3 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(2).isImmediate() &&
"invalid PPC ADDI instruction!");
if (MI.getOperand(1).isRegister() && MI.getOperand(2).getImm() == 0) {
sourceReg = MI.getOperand(1).getReg();
destReg = MI.getOperand(0).getReg();
return true;
}
} else if (oc == PPC::ORI) { // ori r1, r2, 0
assert(MI.getNumOperands() >= 3 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(1).isRegister() &&
MI.getOperand(2).isImmediate() &&
"invalid PPC ORI instruction!");
if (MI.getOperand(2).getImm() == 0) {
sourceReg = MI.getOperand(1).getReg();
destReg = MI.getOperand(0).getReg();
return true;
}
} else if (oc == PPC::FMRS || oc == PPC::FMRD ||
oc == PPC::FMRSD) { // fmr r1, r2
assert(MI.getNumOperands() >= 2 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(1).isRegister() &&
"invalid PPC FMR instruction");
sourceReg = MI.getOperand(1).getReg();
destReg = MI.getOperand(0).getReg();
return true;
} else if (oc == PPC::MCRF) { // mcrf cr1, cr2
assert(MI.getNumOperands() >= 2 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(1).isRegister() &&
"invalid PPC MCRF instruction");
sourceReg = MI.getOperand(1).getReg();
destReg = MI.getOperand(0).getReg();
return true;
}
return false;
}
unsigned PPCInstrInfo::isLoadFromStackSlot(MachineInstr *MI,
int &FrameIndex) const {
switch (MI->getOpcode()) {
default: break;
case PPC::LD:
case PPC::LWZ:
case PPC::LFS:
case PPC::LFD:
if (MI->getOperand(1).isImmediate() && !MI->getOperand(1).getImm() &&
MI->getOperand(2).isFrameIndex()) {
FrameIndex = MI->getOperand(2).getIndex();
return MI->getOperand(0).getReg();
}
break;
}
return 0;
}
unsigned PPCInstrInfo::isStoreToStackSlot(MachineInstr *MI,
int &FrameIndex) const {
switch (MI->getOpcode()) {
default: break;
case PPC::STD:
case PPC::STW:
case PPC::STFS:
case PPC::STFD:
if (MI->getOperand(1).isImmediate() && !MI->getOperand(1).getImm() &&
MI->getOperand(2).isFrameIndex()) {
FrameIndex = MI->getOperand(2).getIndex();
return MI->getOperand(0).getReg();
}
break;
}
return 0;
}
// commuteInstruction - We can commute rlwimi instructions, but only if the
// rotate amt is zero. We also have to munge the immediates a bit.
MachineInstr *
PPCInstrInfo::commuteInstruction(MachineInstr *MI, bool NewMI) const {
MachineFunction &MF = *MI->getParent()->getParent();
// Normal instructions can be commuted the obvious way.
if (MI->getOpcode() != PPC::RLWIMI)
return TargetInstrInfoImpl::commuteInstruction(MI, NewMI);
// Cannot commute if it has a non-zero rotate count.
if (MI->getOperand(3).getImm() != 0)
return 0;
// If we have a zero rotate count, we have:
// M = mask(MB,ME)
// Op0 = (Op1 & ~M) | (Op2 & M)
// Change this to:
// M = mask((ME+1)&31, (MB-1)&31)
// Op0 = (Op2 & ~M) | (Op1 & M)
// Swap op1/op2
unsigned Reg0 = MI->getOperand(0).getReg();
unsigned Reg1 = MI->getOperand(1).getReg();
unsigned Reg2 = MI->getOperand(2).getReg();
bool Reg1IsKill = MI->getOperand(1).isKill();
bool Reg2IsKill = MI->getOperand(2).isKill();
bool ChangeReg0 = false;
// If machine instrs are no longer in two-address forms, update
// destination register as well.
if (Reg0 == Reg1) {
// Must be two address instruction!
assert(MI->getDesc().getOperandConstraint(0, TOI::TIED_TO) &&
"Expecting a two-address instruction!");
Reg2IsKill = false;
ChangeReg0 = true;
}
// Masks.
unsigned MB = MI->getOperand(4).getImm();
unsigned ME = MI->getOperand(5).getImm();
if (NewMI) {
// Create a new instruction.
unsigned Reg0 = ChangeReg0 ? Reg2 : MI->getOperand(0).getReg();
bool Reg0IsDead = MI->getOperand(0).isDead();
return BuildMI(MF, MI->getDesc())
.addReg(Reg0, true, false, false, Reg0IsDead)
.addReg(Reg2, false, false, Reg2IsKill)
.addReg(Reg1, false, false, Reg1IsKill)
.addImm((ME+1) & 31)
.addImm((MB-1) & 31);
}
if (ChangeReg0)
MI->getOperand(0).setReg(Reg2);
MI->getOperand(2).setReg(Reg1);
MI->getOperand(1).setReg(Reg2);
MI->getOperand(2).setIsKill(Reg1IsKill);
MI->getOperand(1).setIsKill(Reg2IsKill);
// Swap the mask around.
MI->getOperand(4).setImm((ME+1) & 31);
MI->getOperand(5).setImm((MB-1) & 31);
return MI;
}
void PPCInstrInfo::insertNoop(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const {
BuildMI(MBB, MI, get(PPC::NOP));
}
// Branch analysis.
bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
SmallVectorImpl<MachineOperand> &Cond) const {
// If the block has no terminators, it just falls into the block after it.
MachineBasicBlock::iterator I = MBB.end();
if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
return false;
// Get the last instruction in the block.
MachineInstr *LastInst = I;
// If there is only one terminator instruction, process it.
if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
if (LastInst->getOpcode() == PPC::B) {
TBB = LastInst->getOperand(0).getMBB();
return false;
} else if (LastInst->getOpcode() == PPC::BCC) {
// Block ends with fall-through condbranch.
TBB = LastInst->getOperand(2).getMBB();
Cond.push_back(LastInst->getOperand(0));
Cond.push_back(LastInst->getOperand(1));
return false;
}
// Otherwise, don't know what this is.
return true;
}
// Get the instruction before it if it's a terminator.
MachineInstr *SecondLastInst = I;
// If there are three terminators, we don't know what sort of block this is.
if (SecondLastInst && I != MBB.begin() &&
isUnpredicatedTerminator(--I))
return true;
// If the block ends with PPC::B and PPC:BCC, handle it.
if (SecondLastInst->getOpcode() == PPC::BCC &&
LastInst->getOpcode() == PPC::B) {
TBB = SecondLastInst->getOperand(2).getMBB();
Cond.push_back(SecondLastInst->getOperand(0));
Cond.push_back(SecondLastInst->getOperand(1));
FBB = LastInst->getOperand(0).getMBB();
return false;
}
// If the block ends with two PPC:Bs, handle it. The second one is not
// executed, so remove it.
if (SecondLastInst->getOpcode() == PPC::B &&
LastInst->getOpcode() == PPC::B) {
TBB = SecondLastInst->getOperand(0).getMBB();
I = LastInst;
I->eraseFromParent();
return false;
}
// Otherwise, can't handle this.
return true;
}
unsigned PPCInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator I = MBB.end();
if (I == MBB.begin()) return 0;
--I;
if (I->getOpcode() != PPC::B && I->getOpcode() != PPC::BCC)
return 0;
// Remove the branch.
I->eraseFromParent();
I = MBB.end();
if (I == MBB.begin()) return 1;
--I;
if (I->getOpcode() != PPC::BCC)
return 1;
// Remove the branch.
I->eraseFromParent();
return 2;
}
unsigned
PPCInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
const SmallVectorImpl<MachineOperand> &Cond) const {
// Shouldn't be a fall through.
assert(TBB && "InsertBranch must not be told to insert a fallthrough");
assert((Cond.size() == 2 || Cond.size() == 0) &&
"PPC branch conditions have two components!");
// One-way branch.
if (FBB == 0) {
if (Cond.empty()) // Unconditional branch
BuildMI(&MBB, get(PPC::B)).addMBB(TBB);
else // Conditional branch
BuildMI(&MBB, get(PPC::BCC))
.addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
return 1;
}
// Two-way Conditional Branch.
BuildMI(&MBB, get(PPC::BCC))
.addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
BuildMI(&MBB, get(PPC::B)).addMBB(FBB);
return 2;
}
bool PPCInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *DestRC,
const TargetRegisterClass *SrcRC) const {
if (DestRC != SrcRC) {
// Not yet supported!
return false;
}
if (DestRC == PPC::GPRCRegisterClass) {
BuildMI(MBB, MI, get(PPC::OR), DestReg).addReg(SrcReg).addReg(SrcReg);
} else if (DestRC == PPC::G8RCRegisterClass) {
BuildMI(MBB, MI, get(PPC::OR8), DestReg).addReg(SrcReg).addReg(SrcReg);
} else if (DestRC == PPC::F4RCRegisterClass) {
BuildMI(MBB, MI, get(PPC::FMRS), DestReg).addReg(SrcReg);
} else if (DestRC == PPC::F8RCRegisterClass) {
BuildMI(MBB, MI, get(PPC::FMRD), DestReg).addReg(SrcReg);
} else if (DestRC == PPC::CRRCRegisterClass) {
BuildMI(MBB, MI, get(PPC::MCRF), DestReg).addReg(SrcReg);
} else if (DestRC == PPC::VRRCRegisterClass) {
BuildMI(MBB, MI, get(PPC::VOR), DestReg).addReg(SrcReg).addReg(SrcReg);
} else if (DestRC == PPC::CRBITRCRegisterClass) {
BuildMI(MBB, MI, get(PPC::CROR), DestReg).addReg(SrcReg).addReg(SrcReg);
} else {
// Attempt to copy register that is not GPR or FPR
return false;
}
return true;
}
bool
PPCInstrInfo::StoreRegToStackSlot(MachineFunction &MF,
unsigned SrcReg, bool isKill,
int FrameIdx,
const TargetRegisterClass *RC,
SmallVectorImpl<MachineInstr*> &NewMIs) const{
if (RC == PPC::GPRCRegisterClass) {
if (SrcReg != PPC::LR) {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STW))
.addReg(SrcReg, false, false, isKill),
FrameIdx));
} else {
// FIXME: this spills LR immediately to memory in one step. To do this,
// we use R11, which we know cannot be used in the prolog/epilog. This is
// a hack.
NewMIs.push_back(BuildMI(MF, get(PPC::MFLR), PPC::R11));
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STW))
.addReg(PPC::R11, false, false, isKill),
FrameIdx));
}
} else if (RC == PPC::G8RCRegisterClass) {
if (SrcReg != PPC::LR8) {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STD))
.addReg(SrcReg, false, false, isKill), FrameIdx));
} else {
// FIXME: this spills LR immediately to memory in one step. To do this,
// we use R11, which we know cannot be used in the prolog/epilog. This is
// a hack.
NewMIs.push_back(BuildMI(MF, get(PPC::MFLR8), PPC::X11));
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STD))
.addReg(PPC::X11, false, false, isKill), FrameIdx));
}
} else if (RC == PPC::F8RCRegisterClass) {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STFD))
.addReg(SrcReg, false, false, isKill), FrameIdx));
} else if (RC == PPC::F4RCRegisterClass) {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STFS))
.addReg(SrcReg, false, false, isKill), FrameIdx));
} else if (RC == PPC::CRRCRegisterClass) {
if ((EnablePPC32RS && !TM.getSubtargetImpl()->isPPC64()) ||
(EnablePPC64RS && TM.getSubtargetImpl()->isPPC64())) {
// FIXME (64-bit): Enable
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::SPILL_CR))
.addReg(SrcReg, false, false, isKill),
FrameIdx));
return true;
} else {
// FIXME: We use R0 here, because it isn't available for RA. We need to
// store the CR in the low 4-bits of the saved value. First, issue a MFCR
// to save all of the CRBits.
NewMIs.push_back(BuildMI(MF, get(PPC::MFCR), PPC::R0));
// If the saved register wasn't CR0, shift the bits left so that they are
// in CR0's slot.
if (SrcReg != PPC::CR0) {
unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(SrcReg)*4;
// rlwinm r0, r0, ShiftBits, 0, 31.
NewMIs.push_back(BuildMI(MF, get(PPC::RLWINM), PPC::R0)
.addReg(PPC::R0).addImm(ShiftBits).addImm(0).addImm(31));
}
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STW))
.addReg(PPC::R0, false, false, isKill),
FrameIdx));
}
} else if (RC == PPC::CRBITRCRegisterClass) {
// FIXME: We use CRi here because there is no mtcrf on a bit. Since the
// backend currently only uses CR1EQ as an individual bit, this should
// not cause any bug. If we need other uses of CR bits, the following
// code may be invalid.
unsigned Reg = 0;
if (SrcReg >= PPC::CR0LT || SrcReg <= PPC::CR0UN)
Reg = PPC::CR0;
else if (SrcReg >= PPC::CR1LT || SrcReg <= PPC::CR1UN)
Reg = PPC::CR1;
else if (SrcReg >= PPC::CR2LT || SrcReg <= PPC::CR2UN)
Reg = PPC::CR2;
else if (SrcReg >= PPC::CR3LT || SrcReg <= PPC::CR3UN)
Reg = PPC::CR3;
else if (SrcReg >= PPC::CR4LT || SrcReg <= PPC::CR4UN)
Reg = PPC::CR4;
else if (SrcReg >= PPC::CR5LT || SrcReg <= PPC::CR5UN)
Reg = PPC::CR5;
else if (SrcReg >= PPC::CR6LT || SrcReg <= PPC::CR6UN)
Reg = PPC::CR6;
else if (SrcReg >= PPC::CR7LT || SrcReg <= PPC::CR7UN)
Reg = PPC::CR7;
return StoreRegToStackSlot(MF, Reg, isKill, FrameIdx,
PPC::CRRCRegisterClass, NewMIs);
} else if (RC == PPC::VRRCRegisterClass) {
// We don't have indexed addressing for vector loads. Emit:
// R0 = ADDI FI#
// STVX VAL, 0, R0
//
// FIXME: We use R0 here, because it isn't available for RA.
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::ADDI), PPC::R0),
FrameIdx, 0, 0));
NewMIs.push_back(BuildMI(MF, get(PPC::STVX))
.addReg(SrcReg, false, false, isKill).addReg(PPC::R0).addReg(PPC::R0));
} else {
assert(0 && "Unknown regclass!");
abort();
}
return false;
}
void
PPCInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill, int FrameIdx,
const TargetRegisterClass *RC) const {
MachineFunction &MF = *MBB.getParent();
SmallVector<MachineInstr*, 4> NewMIs;
if (StoreRegToStackSlot(MF, SrcReg, isKill, FrameIdx, RC, NewMIs)) {
PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
FuncInfo->setSpillsCR();
}
for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
MBB.insert(MI, NewMIs[i]);
}
void PPCInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
bool isKill,
SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC,
SmallVectorImpl<MachineInstr*> &NewMIs) const{
if (Addr[0].isFrameIndex()) {
if (StoreRegToStackSlot(MF, SrcReg, isKill,
Addr[0].getIndex(), RC, NewMIs)) {
PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
FuncInfo->setSpillsCR();
}
return;
}
unsigned Opc = 0;
if (RC == PPC::GPRCRegisterClass) {
Opc = PPC::STW;
} else if (RC == PPC::G8RCRegisterClass) {
Opc = PPC::STD;
} else if (RC == PPC::F8RCRegisterClass) {
Opc = PPC::STFD;
} else if (RC == PPC::F4RCRegisterClass) {
Opc = PPC::STFS;
} else if (RC == PPC::VRRCRegisterClass) {
Opc = PPC::STVX;
} else {
assert(0 && "Unknown regclass!");
abort();
}
MachineInstrBuilder MIB = BuildMI(MF, get(Opc))
.addReg(SrcReg, false, false, isKill);
for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
MachineOperand &MO = Addr[i];
if (MO.isRegister())
MIB.addReg(MO.getReg());
else if (MO.isImmediate())
MIB.addImm(MO.getImm());
else
MIB.addFrameIndex(MO.getIndex());
}
NewMIs.push_back(MIB);
return;
}
void
PPCInstrInfo::LoadRegFromStackSlot(MachineFunction &MF,
unsigned DestReg, int FrameIdx,
const TargetRegisterClass *RC,
SmallVectorImpl<MachineInstr*> &NewMIs)const{
if (RC == PPC::GPRCRegisterClass) {
if (DestReg != PPC::LR) {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LWZ), DestReg),
FrameIdx));
} else {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LWZ), PPC::R11),
FrameIdx));
NewMIs.push_back(BuildMI(MF, get(PPC::MTLR)).addReg(PPC::R11));
}
} else if (RC == PPC::G8RCRegisterClass) {
if (DestReg != PPC::LR8) {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LD), DestReg),
FrameIdx));
} else {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LD), PPC::R11),
FrameIdx));
NewMIs.push_back(BuildMI(MF, get(PPC::MTLR8)).addReg(PPC::R11));
}
} else if (RC == PPC::F8RCRegisterClass) {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LFD), DestReg),
FrameIdx));
} else if (RC == PPC::F4RCRegisterClass) {
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LFS), DestReg),
FrameIdx));
} else if (RC == PPC::CRRCRegisterClass) {
// FIXME: We use R0 here, because it isn't available for RA.
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LWZ), PPC::R0),
FrameIdx));
// If the reloaded register isn't CR0, shift the bits right so that they are
// in the right CR's slot.
if (DestReg != PPC::CR0) {
unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(DestReg)*4;
// rlwinm r11, r11, 32-ShiftBits, 0, 31.
NewMIs.push_back(BuildMI(MF, get(PPC::RLWINM), PPC::R0)
.addReg(PPC::R0).addImm(32-ShiftBits).addImm(0).addImm(31));
}
NewMIs.push_back(BuildMI(MF, get(PPC::MTCRF), DestReg).addReg(PPC::R0));
} else if (RC == PPC::CRBITRCRegisterClass) {
unsigned Reg = 0;
if (DestReg >= PPC::CR0LT || DestReg <= PPC::CR0UN)
Reg = PPC::CR0;
else if (DestReg >= PPC::CR1LT || DestReg <= PPC::CR1UN)
Reg = PPC::CR1;
else if (DestReg >= PPC::CR2LT || DestReg <= PPC::CR2UN)
Reg = PPC::CR2;
else if (DestReg >= PPC::CR3LT || DestReg <= PPC::CR3UN)
Reg = PPC::CR3;
else if (DestReg >= PPC::CR4LT || DestReg <= PPC::CR4UN)
Reg = PPC::CR4;
else if (DestReg >= PPC::CR5LT || DestReg <= PPC::CR5UN)
Reg = PPC::CR5;
else if (DestReg >= PPC::CR6LT || DestReg <= PPC::CR6UN)
Reg = PPC::CR6;
else if (DestReg >= PPC::CR7LT || DestReg <= PPC::CR7UN)
Reg = PPC::CR7;
return LoadRegFromStackSlot(MF, Reg, FrameIdx,
PPC::CRRCRegisterClass, NewMIs);
} else if (RC == PPC::VRRCRegisterClass) {
// We don't have indexed addressing for vector loads. Emit:
// R0 = ADDI FI#
// Dest = LVX 0, R0
//
// FIXME: We use R0 here, because it isn't available for RA.
NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::ADDI), PPC::R0),
FrameIdx, 0, 0));
NewMIs.push_back(BuildMI(MF, get(PPC::LVX),DestReg).addReg(PPC::R0)
.addReg(PPC::R0));
} else {
assert(0 && "Unknown regclass!");
abort();
}
}
void
PPCInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, int FrameIdx,
const TargetRegisterClass *RC) const {
MachineFunction &MF = *MBB.getParent();
SmallVector<MachineInstr*, 4> NewMIs;
LoadRegFromStackSlot(MF, DestReg, FrameIdx, RC, NewMIs);
for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
MBB.insert(MI, NewMIs[i]);
}
void PPCInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC,
SmallVectorImpl<MachineInstr*> &NewMIs)const{
if (Addr[0].isFrameIndex()) {
LoadRegFromStackSlot(MF, DestReg, Addr[0].getIndex(), RC, NewMIs);
return;
}
unsigned Opc = 0;
if (RC == PPC::GPRCRegisterClass) {
assert(DestReg != PPC::LR && "Can't handle this yet!");
Opc = PPC::LWZ;
} else if (RC == PPC::G8RCRegisterClass) {
assert(DestReg != PPC::LR8 && "Can't handle this yet!");
Opc = PPC::LD;
} else if (RC == PPC::F8RCRegisterClass) {
Opc = PPC::LFD;
} else if (RC == PPC::F4RCRegisterClass) {
Opc = PPC::LFS;
} else if (RC == PPC::VRRCRegisterClass) {
Opc = PPC::LVX;
} else {
assert(0 && "Unknown regclass!");
abort();
}
MachineInstrBuilder MIB = BuildMI(MF, get(Opc), DestReg);
for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
MachineOperand &MO = Addr[i];
if (MO.isRegister())
MIB.addReg(MO.getReg());
else if (MO.isImmediate())
MIB.addImm(MO.getImm());
else
MIB.addFrameIndex(MO.getIndex());
}
NewMIs.push_back(MIB);
return;
}
/// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
/// copy instructions, turning them into load/store instructions.
MachineInstr *PPCInstrInfo::foldMemoryOperand(MachineFunction &MF,
MachineInstr *MI,
SmallVectorImpl<unsigned> &Ops,
int FrameIndex) const {
if (Ops.size() != 1) return NULL;
// Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
// it takes more than one instruction to store it.
unsigned Opc = MI->getOpcode();
unsigned OpNum = Ops[0];
MachineInstr *NewMI = NULL;
if ((Opc == PPC::OR &&
MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
if (OpNum == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
NewMI = addFrameReference(BuildMI(MF, get(PPC::STW))
.addReg(InReg, false, false, isKill),
FrameIndex);
} else { // move -> load
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
NewMI = addFrameReference(BuildMI(MF, get(PPC::LWZ))
.addReg(OutReg, true, false, false, isDead),
FrameIndex);
}
} else if ((Opc == PPC::OR8 &&
MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
if (OpNum == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
NewMI = addFrameReference(BuildMI(MF, get(PPC::STD))
.addReg(InReg, false, false, isKill),
FrameIndex);
} else { // move -> load
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
NewMI = addFrameReference(BuildMI(MF, get(PPC::LD))
.addReg(OutReg, true, false, false, isDead),
FrameIndex);
}
} else if (Opc == PPC::FMRD) {
if (OpNum == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
NewMI = addFrameReference(BuildMI(MF, get(PPC::STFD))
.addReg(InReg, false, false, isKill),
FrameIndex);
} else { // move -> load
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
NewMI = addFrameReference(BuildMI(MF, get(PPC::LFD))
.addReg(OutReg, true, false, false, isDead),
FrameIndex);
}
} else if (Opc == PPC::FMRS) {
if (OpNum == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
NewMI = addFrameReference(BuildMI(MF, get(PPC::STFS))
.addReg(InReg, false, false, isKill),
FrameIndex);
} else { // move -> load
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
NewMI = addFrameReference(BuildMI(MF, get(PPC::LFS))
.addReg(OutReg, true, false, false, isDead),
FrameIndex);
}
}
return NewMI;
}
bool PPCInstrInfo::canFoldMemoryOperand(MachineInstr *MI,
SmallVectorImpl<unsigned> &Ops) const {
if (Ops.size() != 1) return false;
// Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
// it takes more than one instruction to store it.
unsigned Opc = MI->getOpcode();
if ((Opc == PPC::OR &&
MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
return true;
else if ((Opc == PPC::OR8 &&
MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
return true;
else if (Opc == PPC::FMRD || Opc == PPC::FMRS)
return true;
return false;
}
bool PPCInstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
if (MBB.empty()) return false;
switch (MBB.back().getOpcode()) {
case PPC::BLR: // Return.
case PPC::B: // Uncond branch.
case PPC::BCTR: // Indirect branch.
return true;
default: return false;
}
}
bool PPCInstrInfo::
ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
assert(Cond.size() == 2 && "Invalid PPC branch opcode!");
// Leave the CR# the same, but invert the condition.
Cond[0].setImm(PPC::InvertPredicate((PPC::Predicate)Cond[0].getImm()));
return false;
}
/// GetInstSize - Return the number of bytes of code the specified
/// instruction may be. This returns the maximum number of bytes.
///
unsigned PPCInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
switch (MI->getOpcode()) {
case PPC::INLINEASM: { // Inline Asm: Variable size.
const MachineFunction *MF = MI->getParent()->getParent();
const char *AsmStr = MI->getOperand(0).getSymbolName();
return MF->getTarget().getTargetAsmInfo()->getInlineAsmLength(AsmStr);
}
case PPC::DBG_LABEL:
case PPC::EH_LABEL:
case PPC::GC_LABEL:
return 0;
default:
return 4; // PowerPC instructions are all 4 bytes
}
}
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