#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Support/Compiler.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
- struct VISIBILITY_HIDDEN LowerSubregsInstructionPass
- : public MachineFunctionPass {
+ struct LowerSubregsInstructionPass : public MachineFunctionPass {
+ private:
+ const TargetRegisterInfo *TRI;
+ const TargetInstrInfo *TII;
+
+ public:
static char ID; // Pass identification, replacement for typeid
LowerSubregsInstructionPass() : MachineFunctionPass(&ID) {}
/// runOnMachineFunction - pass entry point
bool runOnMachineFunction(MachineFunction&);
-
+
+ private:
bool LowerExtract(MachineInstr *MI);
bool LowerInsert(MachineInstr *MI);
bool LowerSubregToReg(MachineInstr *MI);
void TransferDeadFlag(MachineInstr *MI, unsigned DstReg,
- const TargetRegisterInfo &TRI);
+ const TargetRegisterInfo *TRI);
void TransferKillFlag(MachineInstr *MI, unsigned SrcReg,
- const TargetRegisterInfo &TRI);
+ const TargetRegisterInfo *TRI,
+ bool AddIfNotFound = false);
};
char LowerSubregsInstructionPass::ID = 0;
void
LowerSubregsInstructionPass::TransferDeadFlag(MachineInstr *MI,
unsigned DstReg,
- const TargetRegisterInfo &TRI) {
+ const TargetRegisterInfo *TRI) {
for (MachineBasicBlock::iterator MII =
prior(MachineBasicBlock::iterator(MI)); ; --MII) {
- if (MII->addRegisterDead(DstReg, &TRI))
+ if (MII->addRegisterDead(DstReg, TRI))
break;
assert(MII != MI->getParent()->begin() &&
"copyRegToReg output doesn't reference destination register!");
void
LowerSubregsInstructionPass::TransferKillFlag(MachineInstr *MI,
unsigned SrcReg,
- const TargetRegisterInfo &TRI) {
+ const TargetRegisterInfo *TRI,
+ bool AddIfNotFound) {
for (MachineBasicBlock::iterator MII =
prior(MachineBasicBlock::iterator(MI)); ; --MII) {
- if (MII->addRegisterKilled(SrcReg, &TRI))
+ if (MII->addRegisterKilled(SrcReg, TRI, AddIfNotFound))
break;
assert(MII != MI->getParent()->begin() &&
"copyRegToReg output doesn't reference source register!");
bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) {
MachineBasicBlock *MBB = MI->getParent();
- MachineFunction &MF = *MBB->getParent();
- const TargetRegisterInfo &TRI = *MF.getTarget().getRegisterInfo();
- const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
assert(MI->getOperand(0).isReg() && MI->getOperand(0).isDef() &&
MI->getOperand(1).isReg() && MI->getOperand(1).isUse() &&
unsigned DstReg = MI->getOperand(0).getReg();
unsigned SuperReg = MI->getOperand(1).getReg();
unsigned SubIdx = MI->getOperand(2).getImm();
- unsigned SrcReg = TRI.getSubReg(SuperReg, SubIdx);
+ unsigned SrcReg = TRI->getSubReg(SuperReg, SubIdx);
assert(TargetRegisterInfo::isPhysicalRegister(SuperReg) &&
"Extract supperg source must be a physical register");
assert(TargetRegisterInfo::isPhysicalRegister(DstReg) &&
"Extract destination must be in a physical register");
+ assert(SrcReg && "invalid subregister index for register");
- DOUT << "subreg: CONVERTING: " << *MI;
+ DEBUG(dbgs() << "subreg: CONVERTING: " << *MI);
if (SrcReg == DstReg) {
// No need to insert an identity copy instruction.
if (MI->getOperand(1).isKill()) {
- // We must make sure the super-register gets killed.Replace the
- // instruction with IMPLICIT_DEF.
- MI->setDesc(TII.get(TargetInstrInfo::IMPLICIT_DEF));
+ // We must make sure the super-register gets killed. Replace the
+ // instruction with KILL.
+ MI->setDesc(TII->get(TargetOpcode::KILL));
MI->RemoveOperand(2); // SubIdx
- DOUT << "subreg: replace by: " << *MI;
+ DEBUG(dbgs() << "subreg: replace by: " << *MI);
return true;
}
- DOUT << "subreg: eliminated!";
+
+ DEBUG(dbgs() << "subreg: eliminated!");
} else {
// Insert copy
- const TargetRegisterClass *TRCS = TRI.getPhysicalRegisterRegClass(DstReg);
- const TargetRegisterClass *TRCD = TRI.getPhysicalRegisterRegClass(SrcReg);
- bool Emitted = TII.copyRegToReg(*MBB, MI, DstReg, SrcReg, TRCD, TRCS);
+ const TargetRegisterClass *TRCS = TRI->getPhysicalRegisterRegClass(DstReg);
+ const TargetRegisterClass *TRCD = TRI->getPhysicalRegisterRegClass(SrcReg);
+ bool Emitted = TII->copyRegToReg(*MBB, MI, DstReg, SrcReg, TRCD, TRCS);
(void)Emitted;
assert(Emitted && "Subreg and Dst must be of compatible register class");
// Transfer the kill/dead flags, if needed.
if (MI->getOperand(0).isDead())
TransferDeadFlag(MI, DstReg, TRI);
if (MI->getOperand(1).isKill())
- TransferKillFlag(MI, SrcReg, TRI);
-
-#ifndef NDEBUG
- MachineBasicBlock::iterator dMI = MI;
- DOUT << "subreg: " << *(--dMI);
-#endif
+ TransferKillFlag(MI, SuperReg, TRI, true);
+ DEBUG({
+ MachineBasicBlock::iterator dMI = MI;
+ dbgs() << "subreg: " << *(--dMI);
+ });
}
- DOUT << "\n";
+ DEBUG(dbgs() << '\n');
MBB->erase(MI);
return true;
}
bool LowerSubregsInstructionPass::LowerSubregToReg(MachineInstr *MI) {
MachineBasicBlock *MBB = MI->getParent();
- MachineFunction &MF = *MBB->getParent();
- const TargetRegisterInfo &TRI = *MF.getTarget().getRegisterInfo();
- const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
assert((MI->getOperand(0).isReg() && MI->getOperand(0).isDef()) &&
MI->getOperand(1).isImm() &&
(MI->getOperand(2).isReg() && MI->getOperand(2).isUse()) &&
unsigned SubIdx = MI->getOperand(3).getImm();
assert(SubIdx != 0 && "Invalid index for insert_subreg");
- unsigned DstSubReg = TRI.getSubReg(DstReg, SubIdx);
+ unsigned DstSubReg = TRI->getSubReg(DstReg, SubIdx);
assert(TargetRegisterInfo::isPhysicalRegister(DstReg) &&
"Insert destination must be in a physical register");
assert(TargetRegisterInfo::isPhysicalRegister(InsReg) &&
"Inserted value must be in a physical register");
- DOUT << "subreg: CONVERTING: " << *MI;
+ DEBUG(dbgs() << "subreg: CONVERTING: " << *MI);
if (DstSubReg == InsReg && InsSIdx == 0) {
// No need to insert an identify copy instruction.
// %RAX<def> = SUBREG_TO_REG 0, %EAX:3<kill>, 3
// The first def is defining RAX, not EAX so the top bits were not
// zero extended.
- DOUT << "subreg: eliminated!";
+ DEBUG(dbgs() << "subreg: eliminated!");
} else {
// Insert sub-register copy
- const TargetRegisterClass *TRC0= TRI.getPhysicalRegisterRegClass(DstSubReg);
- const TargetRegisterClass *TRC1= TRI.getPhysicalRegisterRegClass(InsReg);
- TII.copyRegToReg(*MBB, MI, DstSubReg, InsReg, TRC0, TRC1);
+ const TargetRegisterClass *TRC0= TRI->getPhysicalRegisterRegClass(DstSubReg);
+ const TargetRegisterClass *TRC1= TRI->getPhysicalRegisterRegClass(InsReg);
+ bool Emitted = TII->copyRegToReg(*MBB, MI, DstSubReg, InsReg, TRC0, TRC1);
+ (void)Emitted;
+ assert(Emitted && "Subreg and Dst must be of compatible register class");
// Transfer the kill/dead flags, if needed.
if (MI->getOperand(0).isDead())
TransferDeadFlag(MI, DstSubReg, TRI);
if (MI->getOperand(2).isKill())
TransferKillFlag(MI, InsReg, TRI);
-
-#ifndef NDEBUG
- MachineBasicBlock::iterator dMI = MI;
- DOUT << "subreg: " << *(--dMI);
-#endif
+ DEBUG({
+ MachineBasicBlock::iterator dMI = MI;
+ dbgs() << "subreg: " << *(--dMI);
+ });
}
- DOUT << "\n";
+ DEBUG(dbgs() << '\n');
MBB->erase(MI);
- return true;
+ return true;
}
bool LowerSubregsInstructionPass::LowerInsert(MachineInstr *MI) {
MachineBasicBlock *MBB = MI->getParent();
- MachineFunction &MF = *MBB->getParent();
- const TargetRegisterInfo &TRI = *MF.getTarget().getRegisterInfo();
- const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
assert((MI->getOperand(0).isReg() && MI->getOperand(0).isDef()) &&
(MI->getOperand(1).isReg() && MI->getOperand(1).isUse()) &&
(MI->getOperand(2).isReg() && MI->getOperand(2).isUse()) &&
assert(DstReg == SrcReg && "insert_subreg not a two-address instruction?");
assert(SubIdx != 0 && "Invalid index for insert_subreg");
- unsigned DstSubReg = TRI.getSubReg(DstReg, SubIdx);
+ unsigned DstSubReg = TRI->getSubReg(DstReg, SubIdx);
assert(DstSubReg && "invalid subregister index for register");
assert(TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
"Insert superreg source must be in a physical register");
assert(TargetRegisterInfo::isPhysicalRegister(InsReg) &&
"Inserted value must be in a physical register");
- DOUT << "subreg: CONVERTING: " << *MI;
+ DEBUG(dbgs() << "subreg: CONVERTING: " << *MI);
if (DstSubReg == InsReg) {
// No need to insert an identity copy instruction. If the SrcReg was
- // <undef>, we need to make sure it is alive by inserting an IMPLICIT_DEF
+ // <undef>, we need to make sure it is alive by inserting a KILL
if (MI->getOperand(1).isUndef() && !MI->getOperand(0).isDead()) {
MachineInstrBuilder MIB = BuildMI(*MBB, MI, MI->getDebugLoc(),
- TII.get(TargetInstrInfo::IMPLICIT_DEF), DstReg);
+ TII->get(TargetOpcode::KILL), DstReg);
if (MI->getOperand(2).isUndef())
- MIB.addReg(InsReg, RegState::Implicit | RegState::Undef);
+ MIB.addReg(InsReg, RegState::Undef);
else
- MIB.addReg(InsReg, RegState::ImplicitKill);
+ MIB.addReg(InsReg, RegState::Kill);
} else {
- DOUT << "subreg: eliminated!\n";
+ DEBUG(dbgs() << "subreg: eliminated!\n");
MBB->erase(MI);
return true;
}
} else {
// Insert sub-register copy
- const TargetRegisterClass *TRC0= TRI.getPhysicalRegisterRegClass(DstSubReg);
- const TargetRegisterClass *TRC1= TRI.getPhysicalRegisterRegClass(InsReg);
+ const TargetRegisterClass *TRC0= TRI->getPhysicalRegisterRegClass(DstSubReg);
+ const TargetRegisterClass *TRC1= TRI->getPhysicalRegisterRegClass(InsReg);
if (MI->getOperand(2).isUndef())
- // If the source register being inserted is undef, then this becomes an
- // implicit_def.
+ // If the source register being inserted is undef, then this becomes a
+ // KILL.
BuildMI(*MBB, MI, MI->getDebugLoc(),
- TII.get(TargetInstrInfo::IMPLICIT_DEF), DstSubReg);
- else
- TII.copyRegToReg(*MBB, MI, DstSubReg, InsReg, TRC0, TRC1);
+ TII->get(TargetOpcode::KILL), DstSubReg);
+ else {
+ bool Emitted = TII->copyRegToReg(*MBB, MI, DstSubReg, InsReg, TRC0, TRC1);
+ (void)Emitted;
+ assert(Emitted && "Subreg and Dst must be of compatible register class");
+ }
MachineBasicBlock::iterator CopyMI = MI;
--CopyMI;
+ // INSERT_SUBREG is a two-address instruction so it implicitly kills SrcReg.
+ if (!MI->getOperand(1).isUndef())
+ CopyMI->addOperand(MachineOperand::CreateReg(DstReg, false, true, true));
+
// Transfer the kill/dead flags, if needed.
if (MI->getOperand(0).isDead()) {
TransferDeadFlag(MI, DstSubReg, TRI);
- // Also add a SrcReg<imp-kill> of the super register.
- CopyMI->addOperand(MachineOperand::CreateReg(DstReg, false, true, true));
- } else if (MI->getOperand(1).isUndef()) {
- // If SrcReg was marked <undef> we must make sure it is alive after this
- // replacement. Add a SrcReg<imp-def> operand.
+ } else {
+ // Make sure the full DstReg is live after this replacement.
CopyMI->addOperand(MachineOperand::CreateReg(DstReg, true, true));
}
TransferKillFlag(MI, InsReg, TRI);
}
-#ifndef NDEBUG
- MachineBasicBlock::iterator dMI = MI;
- DOUT << "subreg: " << *(--dMI);
-#endif
+ DEBUG({
+ MachineBasicBlock::iterator dMI = MI;
+ dbgs() << "subreg: " << *(--dMI) << "\n";
+ });
- DOUT << "\n";
MBB->erase(MI);
- return true;
+ return true;
}
/// runOnMachineFunction - Reduce subregister inserts and extracts to register
/// copies.
///
bool LowerSubregsInstructionPass::runOnMachineFunction(MachineFunction &MF) {
- DOUT << "Machine Function\n";
-
- bool MadeChange = false;
+ DEBUG(dbgs() << "Machine Function\n"
+ << "********** LOWERING SUBREG INSTRS **********\n"
+ << "********** Function: "
+ << MF.getFunction()->getName() << '\n');
+ TRI = MF.getTarget().getRegisterInfo();
+ TII = MF.getTarget().getInstrInfo();
- DOUT << "********** LOWERING SUBREG INSTRS **********\n";
- DEBUG(errs() << "********** Function: "
- << MF.getFunction()->getName() << '\n');
+ bool MadeChange = false;
for (MachineFunction::iterator mbbi = MF.begin(), mbbe = MF.end();
mbbi != mbbe; ++mbbi) {
for (MachineBasicBlock::iterator mi = mbbi->begin(), me = mbbi->end();
mi != me;) {
- MachineInstr *MI = mi++;
-
- if (MI->getOpcode() == TargetInstrInfo::EXTRACT_SUBREG) {
+ MachineBasicBlock::iterator nmi = llvm::next(mi);
+ MachineInstr *MI = mi;
+ if (MI->isExtractSubreg()) {
MadeChange |= LowerExtract(MI);
- } else if (MI->getOpcode() == TargetInstrInfo::INSERT_SUBREG) {
+ } else if (MI->isInsertSubreg()) {
MadeChange |= LowerInsert(MI);
- } else if (MI->getOpcode() == TargetInstrInfo::SUBREG_TO_REG) {
+ } else if (MI->isSubregToReg()) {
MadeChange |= LowerSubregToReg(MI);
}
+ mi = nmi;
}
}
projects / oota-llvm.git / blobdiff