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Enable pre-regalloc load / store multiple pass for Thumb2.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82893 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-09-27 09:46:04 +00:00
parent 9217f6b2e4
commit e298ab26b1
4 changed files with 114 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/ARM/ARMLoadStoreOptimizer.cpp
+88 -55
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@@ -683,7 +683,7 @@ static bool isMemoryOp(const MachineInstr *MI) {
case ARM::t2LDRi12:
case ARM::t2STRi8:
case ARM::t2STRi12:
return true;
return MI->getOperand(1).isReg();
}
return false;
}
@@ -737,37 +737,43 @@ static void InsertLDR_STR(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI,
int OffImm, bool isDef,
DebugLoc dl, unsigned NewOpc,
unsigned Reg, bool RegDeadKill,
unsigned BaseReg, bool BaseKill,
unsigned OffReg, bool OffKill,
unsigned Reg, bool RegDeadKill, bool RegUndef,
unsigned BaseReg, bool BaseKill, bool BaseUndef,
unsigned OffReg, bool OffKill, bool OffUndef,
ARMCC::CondCodes Pred, unsigned PredReg,
const TargetInstrInfo *TII) {
unsigned Offset;
if (OffImm < 0)
Offset = ARM_AM::getAM2Opc(ARM_AM::sub, -OffImm, ARM_AM::no_shift);
else
Offset = ARM_AM::getAM2Opc(ARM_AM::add, OffImm, ARM_AM::no_shift);
if (isDef)
BuildMI(MBB, MBBI, MBBI->getDebugLoc(), TII->get(NewOpc))
const TargetInstrInfo *TII, bool isT2) {
int Offset = OffImm;
if (!isT2) {
if (OffImm < 0)
Offset = ARM_AM::getAM2Opc(ARM_AM::sub, -OffImm, ARM_AM::no_shift);
else
Offset = ARM_AM::getAM2Opc(ARM_AM::add, OffImm, ARM_AM::no_shift);
}
if (isDef) {
MachineInstrBuilder MIB = BuildMI(MBB, MBBI, MBBI->getDebugLoc(),
TII->get(NewOpc))
.addReg(Reg, getDefRegState(true) | getDeadRegState(RegDeadKill))
.addReg(BaseReg, getKillRegState(BaseKill))
.addReg(OffReg, getKillRegState(OffKill))
.addImm(Offset)
.addImm(Pred).addReg(PredReg);
else
BuildMI(MBB, MBBI, MBBI->getDebugLoc(), TII->get(NewOpc))
.addReg(Reg, getKillRegState(RegDeadKill))
.addReg(BaseReg, getKillRegState(BaseKill))
.addReg(OffReg, getKillRegState(OffKill))
.addImm(Offset)
.addImm(Pred).addReg(PredReg);
.addReg(BaseReg, getKillRegState(BaseKill)|getUndefRegState(BaseUndef));
if (!isT2)
MIB.addReg(OffReg, getKillRegState(OffKill)|getUndefRegState(OffUndef));
MIB.addImm(Offset).addImm(Pred).addReg(PredReg);
} else {
MachineInstrBuilder MIB = BuildMI(MBB, MBBI, MBBI->getDebugLoc(),
TII->get(NewOpc))
.addReg(Reg, getKillRegState(RegDeadKill) | getUndefRegState(RegUndef))
.addReg(BaseReg, getKillRegState(BaseKill)|getUndefRegState(BaseUndef));
if (!isT2)
MIB.addReg(OffReg, getKillRegState(OffKill)|getUndefRegState(OffUndef));
MIB.addImm(Offset).addImm(Pred).addReg(PredReg);
}
}
bool ARMLoadStoreOpt::FixInvalidRegPairOp(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI) {
MachineInstr *MI = &*MBBI;
unsigned Opcode = MI->getOpcode();
if (Opcode == ARM::LDRD || Opcode == ARM::STRD) {
if (Opcode == ARM::LDRD || Opcode == ARM::STRD ||
Opcode == ARM::t2LDRDi8 || Opcode == ARM::t2STRDi8) {
unsigned EvenReg = MI->getOperand(0).getReg();
unsigned OddReg = MI->getOperand(1).getReg();
unsigned EvenRegNum = TRI->getDwarfRegNum(EvenReg, false);
@@ -775,17 +781,21 @@ bool ARMLoadStoreOpt::FixInvalidRegPairOp(MachineBasicBlock &MBB,
if ((EvenRegNum & 1) == 0 && (EvenRegNum + 1) == OddRegNum)
return false;
bool isLd = Opcode == ARM::LDRD;
bool isT2 = Opcode == ARM::t2LDRDi8 || Opcode == ARM::t2STRDi8;
bool isLd = Opcode == ARM::LDRD || Opcode == ARM::t2LDRDi8;
bool EvenDeadKill = isLd ?
MI->getOperand(0).isDead() : MI->getOperand(0).isKill();
bool EvenUndef = MI->getOperand(0).isUndef();
bool OddDeadKill = isLd ?
MI->getOperand(1).isDead() : MI->getOperand(1).isKill();
bool OddUndef = MI->getOperand(1).isUndef();
const MachineOperand &BaseOp = MI->getOperand(2);
unsigned BaseReg = BaseOp.getReg();
bool BaseKill = BaseOp.isKill();
const MachineOperand &OffOp = MI->getOperand(3);
unsigned OffReg = OffOp.getReg();
bool OffKill = OffOp.isKill();
bool BaseUndef = BaseOp.isUndef();
unsigned OffReg = isT2 ? 0 : MI->getOperand(3).getReg();
bool OffKill = isT2 ? false : MI->getOperand(3).isKill();
bool OffUndef = isT2 ? false : MI->getOperand(3).isUndef();
int OffImm = getMemoryOpOffset(MI);
unsigned PredReg = 0;
ARMCC::CondCodes Pred = llvm::getInstrPredicate(MI, PredReg);
@@ -793,27 +803,35 @@ bool ARMLoadStoreOpt::FixInvalidRegPairOp(MachineBasicBlock &MBB,
if (OddRegNum > EvenRegNum && OffReg == 0 && OffImm == 0) {
// Ascending register numbers and no offset. It's safe to change it to a
// ldm or stm.
unsigned NewOpc = (Opcode == ARM::LDRD) ? ARM::LDM : ARM::STM;
unsigned NewOpc = (isLd)
? (isT2 ? ARM::t2LDM : ARM::LDM)
: (isT2 ? ARM::t2STM : ARM::STM);
if (isLd) {
BuildMI(MBB, MBBI, MBBI->getDebugLoc(), TII->get(NewOpc))
.addReg(BaseReg, getKillRegState(BaseKill))
.addImm(ARM_AM::getAM4ModeImm(ARM_AM::ia))
.addImm(Pred).addReg(PredReg)
.addReg(EvenReg, getDefRegState(isLd) | getDeadRegState(EvenDeadKill))
.addReg(OddReg, getDefRegState(isLd) | getDeadRegState(OddDeadKill));
.addReg(OddReg, getDefRegState(isLd)| getDeadRegState(OddDeadKill));
++NumLDRD2LDM;
} else {
BuildMI(MBB, MBBI, MBBI->getDebugLoc(), TII->get(NewOpc))
.addReg(BaseReg, getKillRegState(BaseKill))
.addImm(ARM_AM::getAM4ModeImm(ARM_AM::ia))
.addImm(Pred).addReg(PredReg)
.addReg(EvenReg, getKillRegState(EvenDeadKill))
.addReg(OddReg, getKillRegState(OddDeadKill));
.addReg(EvenReg,
getKillRegState(EvenDeadKill) | getUndefRegState(EvenUndef))
.addReg(OddReg,
getKillRegState(OddDeadKill) | getUndefRegState(OddUndef));
++NumSTRD2STM;
}
} else {
// Split into two instructions.
unsigned NewOpc = (Opcode == ARM::LDRD) ? ARM::LDR : ARM::STR;
assert((!isT2 || !OffReg) &&
"Thumb2 ldrd / strd does not encode offset register!");
unsigned NewOpc = (isLd)
? (isT2 ? (OffImm < 0 ? ARM::t2LDRi8 : ARM::t2LDRi12) : ARM::LDR)
: (isT2 ? (OffImm < 0 ? ARM::t2STRi8 : ARM::t2STRi12) : ARM::STR);
DebugLoc dl = MBBI->getDebugLoc();
// If this is a load and base register is killed, it may have been
// re-defed by the load, make sure the first load does not clobber it.
@@ -823,17 +841,23 @@ bool ARMLoadStoreOpt::FixInvalidRegPairOp(MachineBasicBlock &MBB,
(OffReg && TRI->regsOverlap(EvenReg, OffReg)))) {
assert(!TRI->regsOverlap(OddReg, BaseReg) &&
(!OffReg || !TRI->regsOverlap(OddReg, OffReg)));
InsertLDR_STR(MBB, MBBI, OffImm+4, isLd, dl, NewOpc, OddReg, OddDeadKill,
BaseReg, false, OffReg, false, Pred, PredReg, TII);
InsertLDR_STR(MBB, MBBI, OffImm, isLd, dl, NewOpc, EvenReg, EvenDeadKill,
BaseReg, BaseKill, OffReg, OffKill, Pred, PredReg, TII);
InsertLDR_STR(MBB, MBBI, OffImm+4, isLd, dl, NewOpc,
OddReg, OddDeadKill, false,
BaseReg, false, BaseUndef, OffReg, false, OffUndef,
Pred, PredReg, TII, isT2);
InsertLDR_STR(MBB, MBBI, OffImm, isLd, dl, NewOpc,
EvenReg, EvenDeadKill, false,
BaseReg, BaseKill, BaseUndef, OffReg, OffKill, OffUndef,
Pred, PredReg, TII, isT2);
} else {
InsertLDR_STR(MBB, MBBI, OffImm, isLd, dl, NewOpc,
EvenReg, EvenDeadKill, BaseReg, false, OffReg, false,
Pred, PredReg, TII);
EvenReg, EvenDeadKill, EvenUndef,
BaseReg, false, BaseUndef, OffReg, false, OffUndef,
Pred, PredReg, TII, isT2);
InsertLDR_STR(MBB, MBBI, OffImm+4, isLd, dl, NewOpc,
OddReg, OddDeadKill, BaseReg, BaseKill, OffReg, OffKill,
Pred, PredReg, TII);
OddReg, OddDeadKill, OddUndef,
BaseReg, BaseKill, BaseUndef, OffReg, OffKill, OffUndef,
Pred, PredReg, TII, isT2);
}
if (isLd)
++NumLDRD2LDR;
@@ -1083,7 +1107,7 @@ namespace {
bool CanFormLdStDWord(MachineInstr *Op0, MachineInstr *Op1, DebugLoc &dl,
unsigned &NewOpc, unsigned &EvenReg,
unsigned &OddReg, unsigned &BaseReg,
unsigned &OffReg, unsigned &Offset,
unsigned &OffReg, int &Offset,
unsigned &PredReg, ARMCC::CondCodes &Pred,
bool &isT2);
bool RescheduleOps(MachineBasicBlock *MBB,
@@ -1163,7 +1187,7 @@ ARMPreAllocLoadStoreOpt::CanFormLdStDWord(MachineInstr *Op0, MachineInstr *Op1,
DebugLoc &dl,
unsigned &NewOpc, unsigned &EvenReg,
unsigned &OddReg, unsigned &BaseReg,
unsigned &OffReg, unsigned &Offset,
unsigned &OffReg, int &Offset,
unsigned &PredReg,
ARMCC::CondCodes &Pred,
bool &isT2) {
@@ -1206,19 +1230,28 @@ ARMPreAllocLoadStoreOpt::CanFormLdStDWord(MachineInstr *Op0, MachineInstr *Op1,
// Then make sure the immediate offset fits.
int OffImm = getMemoryOpOffset(Op0);
ARM_AM::AddrOpc AddSub = ARM_AM::add;
if (OffImm < 0) {
AddSub = ARM_AM::sub;
OffImm = - OffImm;
}
int Limit = (1 << 8) * Scale;
if (OffImm >= Limit || (OffImm & (Scale-1)))
return false;
if (isT2)
if (isT2) {
if (OffImm < 0) {
if (OffImm < -255)
// Can't fall back to t2LDRi8 / t2STRi8.
return false;
} else {
int Limit = (1 << 8) * Scale;
if (OffImm >= Limit || (OffImm & (Scale-1)))
return false;
}
Offset = OffImm;
else
} else {
ARM_AM::AddrOpc AddSub = ARM_AM::add;
if (OffImm < 0) {
AddSub = ARM_AM::sub;
OffImm = - OffImm;
}
int Limit = (1 << 8) * Scale;
if (OffImm >= Limit || (OffImm & (Scale-1)))
return false;
Offset = ARM_AM::getAM3Opc(AddSub, OffImm);
}
EvenReg = Op0->getOperand(0).getReg();
OddReg = Op1->getOperand(0).getReg();
if (EvenReg == OddReg)
@@ -1316,7 +1349,7 @@ bool ARMPreAllocLoadStoreOpt::RescheduleOps(MachineBasicBlock *MBB,
ARMCC::CondCodes Pred = ARMCC::AL;
bool isT2 = false;
unsigned NewOpc = 0;
unsigned Offset = 0;
int Offset = 0;
DebugLoc dl;
if (NumMove == 2 && CanFormLdStDWord(Op0, Op1, dl, NewOpc,
EvenReg, OddReg, BaseReg, OffReg,