MachineBasicBlock *
MipsTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) const {
- // There is no need to expand CMov instructions if target has
- // conditional moves.
- if (Subtarget->hasCondMov())
- return BB;
-
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
bool isFPCmp = false;
DebugLoc dl = MI->getDebugLoc();
switch (MI->getOpcode()) {
default: assert(false && "Unexpected instr type to insert");
+
+ case Mips::ATOMIC_LOAD_ADD_I8:
+ return EmitAtomicBinaryPartword(MI, BB, 1, Mips::ADDu);
+ case Mips::ATOMIC_LOAD_ADD_I16:
+ return EmitAtomicBinaryPartword(MI, BB, 2, Mips::ADDu);
+ case Mips::ATOMIC_LOAD_ADD_I32:
+ return EmitAtomicBinary(MI, BB, 4, Mips::ADDu);
+
+ case Mips::ATOMIC_LOAD_AND_I8:
+ return EmitAtomicBinaryPartword(MI, BB, 1, Mips::AND);
+ case Mips::ATOMIC_LOAD_AND_I16:
+ return EmitAtomicBinaryPartword(MI, BB, 2, Mips::AND);
+ case Mips::ATOMIC_LOAD_AND_I32:
+ return EmitAtomicBinary(MI, BB, 4, Mips::AND);
+
+ case Mips::ATOMIC_LOAD_OR_I8:
+ return EmitAtomicBinaryPartword(MI, BB, 1, Mips::OR);
+ case Mips::ATOMIC_LOAD_OR_I16:
+ return EmitAtomicBinaryPartword(MI, BB, 2, Mips::OR);
+ case Mips::ATOMIC_LOAD_OR_I32:
+ return EmitAtomicBinary(MI, BB, 4, Mips::OR);
+
+ case Mips::ATOMIC_LOAD_XOR_I8:
+ return EmitAtomicBinaryPartword(MI, BB, 1, Mips::XOR);
+ case Mips::ATOMIC_LOAD_XOR_I16:
+ return EmitAtomicBinaryPartword(MI, BB, 2, Mips::XOR);
+ case Mips::ATOMIC_LOAD_XOR_I32:
+ return EmitAtomicBinary(MI, BB, 4, Mips::XOR);
+
+ case Mips::ATOMIC_LOAD_NAND_I8:
+ return EmitAtomicBinaryPartword(MI, BB, 1, 0, true);
+ case Mips::ATOMIC_LOAD_NAND_I16:
+ return EmitAtomicBinaryPartword(MI, BB, 2, 0, true);
+ case Mips::ATOMIC_LOAD_NAND_I32:
+ return EmitAtomicBinary(MI, BB, 4, 0, true);
+
+ case Mips::ATOMIC_LOAD_SUB_I8:
+ return EmitAtomicBinaryPartword(MI, BB, 1, Mips::SUBu);
+ case Mips::ATOMIC_LOAD_SUB_I16:
+ return EmitAtomicBinaryPartword(MI, BB, 2, Mips::SUBu);
+ case Mips::ATOMIC_LOAD_SUB_I32:
+ return EmitAtomicBinary(MI, BB, 4, Mips::SUBu);
+
+ case Mips::ATOMIC_SWAP_I8:
+ return EmitAtomicBinaryPartword(MI, BB, 1, 0);
+ case Mips::ATOMIC_SWAP_I16:
+ return EmitAtomicBinaryPartword(MI, BB, 2, 0);
+ case Mips::ATOMIC_SWAP_I32:
+ return EmitAtomicBinary(MI, BB, 4, 0);
+
+ case Mips::ATOMIC_CMP_SWAP_I8:
+ return EmitAtomicCmpSwapPartword(MI, BB, 1);
+ case Mips::ATOMIC_CMP_SWAP_I16:
+ return EmitAtomicCmpSwapPartword(MI, BB, 2);
+ case Mips::ATOMIC_CMP_SWAP_I32:
+ return EmitAtomicCmpSwap(MI, BB, 4);
+
case Mips::MOVT:
case Mips::MOVT_S:
case Mips::MOVT_D:
break;
}
+ // There is no need to expand CMov instructions if target has
+ // conditional moves.
+ if (Subtarget->hasCondMov())
+ return BB;
+
// To "insert" a SELECT_CC instruction, we actually have to insert the
// diamond control-flow pattern. The incoming instruction knows the
// destination vreg to set, the condition code register to branch on, the
return BB;
}
+// This function also handles Mips::ATOMIC_SWAP_I32 (when BinOpcode == 0), and
+// Mips::ATOMIC_LOAD_NAND_I32 (when Nand == true)
+MachineBasicBlock *
+MipsTargetLowering::EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
+ unsigned Size, unsigned BinOpcode, bool Nand) const {
+ assert(Size == 4 && "Unsupported size for EmitAtomicBinary.");
+
+ MachineFunction *MF = BB->getParent();
+ MachineRegisterInfo &RegInfo = MF->getRegInfo();
+ const TargetRegisterClass *RC = getRegClassFor(MVT::i32);
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ DebugLoc dl = MI->getDebugLoc();
+
+ unsigned Dest = MI->getOperand(0).getReg();
+ unsigned Ptr = MI->getOperand(1).getReg();
+ unsigned Incr = MI->getOperand(2).getReg();
+
+ unsigned Oldval = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp1 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp2 = RegInfo.createVirtualRegister(RC);
+
+ // insert new blocks after the current block
+ const BasicBlock *LLVM_BB = BB->getBasicBlock();
+ MachineBasicBlock *loopMBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineFunction::iterator It = BB;
+ ++It;
+ MF->insert(It, loopMBB);
+ MF->insert(It, exitMBB);
+
+ // Transfer the remainder of BB and its successor edges to exitMBB.
+ exitMBB->splice(exitMBB->begin(), BB,
+ llvm::next(MachineBasicBlock::iterator(MI)),
+ BB->end());
+ exitMBB->transferSuccessorsAndUpdatePHIs(BB);
+
+ // thisMBB:
+ // ...
+ // sw incr, fi(sp) // store incr to stack (when BinOpcode == 0)
+ // fallthrough --> loopMBB
+
+ // Note: for atomic.swap (when BinOpcode == 0), storing incr to stack before
+ // the loop and then loading it from stack in block loopMBB is necessary to
+ // prevent MachineLICM pass to hoist "or" instruction out of the block
+ // loopMBB.
+
+ int fi;
+ if (BinOpcode == 0 && !Nand) {
+ // Get or create a temporary stack location.
+ MipsFunctionInfo *MipsFI = MF->getInfo<MipsFunctionInfo>();
+ fi = MipsFI->getAtomicFrameIndex();
+ if (fi == -1) {
+ fi = MF->getFrameInfo()->CreateStackObject(Size, Size, false);
+ MipsFI->setAtomicFrameIndex(fi);
+ }
+
+ BuildMI(BB, dl, TII->get(Mips::SW))
+ .addReg(Incr).addImm(0).addFrameIndex(fi);
+ }
+ BB->addSuccessor(loopMBB);
+
+ // loopMBB:
+ // ll oldval, 0(ptr)
+ // or dest, $0, oldval
+ // <binop> tmp1, oldval, incr
+ // sc tmp1, 0(ptr)
+ // beq tmp1, $0, loopMBB
+ BB = loopMBB;
+ BuildMI(BB, dl, TII->get(Mips::LL), Oldval).addImm(0).addReg(Ptr);
+ BuildMI(BB, dl, TII->get(Mips::OR), Dest).addReg(Mips::ZERO).addReg(Oldval);
+ if (Nand) {
+ // and tmp2, oldval, incr
+ // nor tmp1, $0, tmp2
+ BuildMI(BB, dl, TII->get(Mips::AND), Tmp2).addReg(Oldval).addReg(Incr);
+ BuildMI(BB, dl, TII->get(Mips::NOR), Tmp1).addReg(Mips::ZERO).addReg(Tmp2);
+ } else if (BinOpcode) {
+ // <binop> tmp1, oldval, incr
+ BuildMI(BB, dl, TII->get(BinOpcode), Tmp1).addReg(Oldval).addReg(Incr);
+ } else {
+ // lw tmp2, fi(sp) // load incr from stack
+ // or tmp1, $zero, tmp2
+ BuildMI(BB, dl, TII->get(Mips::LW), Tmp2).addImm(0).addFrameIndex(fi);;
+ BuildMI(BB, dl, TII->get(Mips::OR), Tmp1).addReg(Mips::ZERO).addReg(Tmp2);
+ }
+ BuildMI(BB, dl, TII->get(Mips::SC), Tmp1).addReg(Tmp1).addImm(0).addReg(Ptr);
+ BuildMI(BB, dl, TII->get(Mips::BEQ))
+ .addReg(Tmp1).addReg(Mips::ZERO).addMBB(loopMBB);
+ BB->addSuccessor(loopMBB);
+ BB->addSuccessor(exitMBB);
+
+ MI->eraseFromParent(); // The instruction is gone now.
+
+ return BB;
+}
+
+MachineBasicBlock *
+MipsTargetLowering::EmitAtomicBinaryPartword(MachineInstr *MI,
+ MachineBasicBlock *BB, unsigned Size, unsigned BinOpcode,
+ bool Nand) const {
+ assert((Size == 1 || Size == 2) &&
+ "Unsupported size for EmitAtomicBinaryPartial.");
+
+ MachineFunction *MF = BB->getParent();
+ MachineRegisterInfo &RegInfo = MF->getRegInfo();
+ const TargetRegisterClass *RC = getRegClassFor(MVT::i32);
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ DebugLoc dl = MI->getDebugLoc();
+
+ unsigned Dest = MI->getOperand(0).getReg();
+ unsigned Ptr = MI->getOperand(1).getReg();
+ unsigned Incr = MI->getOperand(2).getReg();
+
+ unsigned Addr = RegInfo.createVirtualRegister(RC);
+ unsigned Shift = RegInfo.createVirtualRegister(RC);
+ unsigned Mask = RegInfo.createVirtualRegister(RC);
+ unsigned Mask2 = RegInfo.createVirtualRegister(RC);
+ unsigned Newval = RegInfo.createVirtualRegister(RC);
+ unsigned Oldval = RegInfo.createVirtualRegister(RC);
+ unsigned Incr2 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp1 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp2 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp3 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp4 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp5 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp6 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp7 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp8 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp9 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp10 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp11 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp12 = RegInfo.createVirtualRegister(RC);
+
+ // insert new blocks after the current block
+ const BasicBlock *LLVM_BB = BB->getBasicBlock();
+ MachineBasicBlock *loopMBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineFunction::iterator It = BB;
+ ++It;
+ MF->insert(It, loopMBB);
+ MF->insert(It, exitMBB);
+
+ // Transfer the remainder of BB and its successor edges to exitMBB.
+ exitMBB->splice(exitMBB->begin(), BB,
+ llvm::next(MachineBasicBlock::iterator(MI)),
+ BB->end());
+ exitMBB->transferSuccessorsAndUpdatePHIs(BB);
+
+ // thisMBB:
+ // addiu tmp1,$0,-4 # 0xfffffffc
+ // and addr,ptr,tmp1
+ // andi tmp2,ptr,3
+ // sll shift,tmp2,3
+ // ori tmp3,$0,255 # 0xff
+ // sll mask,tmp3,shift
+ // nor mask2,$0,mask
+ // andi tmp4,incr,255
+ // sll incr2,tmp4,shift
+ // sw incr2, fi(sp) // store incr2 to stack (when BinOpcode == 0)
+
+ // Note: for atomic.swap (when BinOpcode == 0), storing incr2 to stack before
+ // the loop and then loading it from stack in block loopMBB is necessary to
+ // prevent MachineLICM pass to hoist "or" instruction out of the block
+ // loopMBB.
+
+ int64_t MaskImm = (Size == 1) ? 255 : 65535;
+ BuildMI(BB, dl, TII->get(Mips::ADDiu), Tmp1).addReg(Mips::ZERO).addImm(-4);
+ BuildMI(BB, dl, TII->get(Mips::AND), Addr).addReg(Ptr).addReg(Tmp1);
+ BuildMI(BB, dl, TII->get(Mips::ANDi), Tmp2).addReg(Ptr).addImm(3);
+ BuildMI(BB, dl, TII->get(Mips::SLL), Shift).addReg(Tmp2).addImm(3);
+ BuildMI(BB, dl, TII->get(Mips::ORi), Tmp3).addReg(Mips::ZERO).addImm(MaskImm);
+ BuildMI(BB, dl, TII->get(Mips::SLL), Mask).addReg(Tmp3).addReg(Shift);
+ BuildMI(BB, dl, TII->get(Mips::NOR), Mask2).addReg(Mips::ZERO).addReg(Mask);
+ if (BinOpcode != Mips::SUBu) {
+ BuildMI(BB, dl, TII->get(Mips::ANDi), Tmp4).addReg(Incr).addImm(MaskImm);
+ BuildMI(BB, dl, TII->get(Mips::SLL), Incr2).addReg(Tmp4).addReg(Shift);
+ } else {
+ BuildMI(BB, dl, TII->get(Mips::SUBu), Tmp4).addReg(Mips::ZERO).addReg(Incr);
+ BuildMI(BB, dl, TII->get(Mips::ANDi), Tmp5).addReg(Tmp4).addImm(MaskImm);
+ BuildMI(BB, dl, TII->get(Mips::SLL), Incr2).addReg(Tmp5).addReg(Shift);
+ }
+ int fi;
+ if (BinOpcode == 0 && !Nand) {
+ // Get or create a temporary stack location.
+ MipsFunctionInfo *MipsFI = MF->getInfo<MipsFunctionInfo>();
+ fi = MipsFI->getAtomicFrameIndex();
+ if (fi == -1) {
+ fi = MF->getFrameInfo()->CreateStackObject(Size, Size, false);
+ MipsFI->setAtomicFrameIndex(fi);
+ }
+
+ BuildMI(BB, dl, TII->get(Mips::SW))
+ .addReg(Incr2).addImm(0).addFrameIndex(fi);
+ }
+ BB->addSuccessor(loopMBB);
+
+ // loopMBB:
+ // ll oldval,0(addr)
+ // binop tmp7,oldval,incr2
+ // and newval,tmp7,mask
+ // and tmp8,oldval,mask2
+ // or tmp9,tmp8,newval
+ // sc tmp9,0(addr)
+ // beq tmp9,$0,loopMBB
+ BB = loopMBB;
+ BuildMI(BB, dl, TII->get(Mips::LL), Oldval).addImm(0).addReg(Addr);
+ if (Nand) {
+ // and tmp6, oldval, incr2
+ // nor tmp7, $0, tmp6
+ BuildMI(BB, dl, TII->get(Mips::AND), Tmp6).addReg(Oldval).addReg(Incr2);
+ BuildMI(BB, dl, TII->get(Mips::NOR), Tmp7).addReg(Mips::ZERO).addReg(Tmp6);
+ } else if (BinOpcode == Mips::SUBu) {
+ // addu tmp7, oldval, incr2
+ BuildMI(BB, dl, TII->get(Mips::ADDu), Tmp7).addReg(Oldval).addReg(Incr2);
+ } else if (BinOpcode) {
+ // <binop> tmp7, oldval, incr2
+ BuildMI(BB, dl, TII->get(BinOpcode), Tmp7).addReg(Oldval).addReg(Incr2);
+ } else {
+ // lw tmp6, fi(sp) // load incr2 from stack
+ // or tmp7, $zero, tmp6
+ BuildMI(BB, dl, TII->get(Mips::LW), Tmp6).addImm(0).addFrameIndex(fi);;
+ BuildMI(BB, dl, TII->get(Mips::OR), Tmp7).addReg(Mips::ZERO).addReg(Tmp6);
+ }
+ BuildMI(BB, dl, TII->get(Mips::AND), Newval).addReg(Tmp7).addReg(Mask);
+ BuildMI(BB, dl, TII->get(Mips::AND), Tmp8).addReg(Oldval).addReg(Mask2);
+ BuildMI(BB, dl, TII->get(Mips::OR), Tmp9).addReg(Tmp8).addReg(Newval);
+ BuildMI(BB, dl, TII->get(Mips::SC), Tmp9).addReg(Tmp9).addImm(0).addReg(Addr);
+ BuildMI(BB, dl, TII->get(Mips::BEQ))
+ .addReg(Tmp9).addReg(Mips::ZERO).addMBB(loopMBB);
+ BB->addSuccessor(loopMBB);
+ BB->addSuccessor(exitMBB);
+
+ // exitMBB:
+ // and tmp10,oldval,mask
+ // srl tmp11,tmp10,shift
+ // sll tmp12,tmp11,24
+ // sra dest,tmp12,24
+ BB = exitMBB;
+ int64_t ShiftImm = (Size == 1) ? 24 : 16;
+ // reverse order
+ BuildMI(*BB, BB->begin(), dl, TII->get(Mips::SRA), Dest)
+ .addReg(Tmp12).addImm(ShiftImm);
+ BuildMI(*BB, BB->begin(), dl, TII->get(Mips::SLL), Tmp12)
+ .addReg(Tmp11).addImm(ShiftImm);
+ BuildMI(*BB, BB->begin(), dl, TII->get(Mips::SRL), Tmp11)
+ .addReg(Tmp10).addReg(Shift);
+ BuildMI(*BB, BB->begin(), dl, TII->get(Mips::AND), Tmp10)
+ .addReg(Oldval).addReg(Mask);
+
+ MI->eraseFromParent(); // The instruction is gone now.
+
+ return BB;
+}
+
+MachineBasicBlock *
+MipsTargetLowering::EmitAtomicCmpSwap(MachineInstr *MI,
+ MachineBasicBlock *BB,
+ unsigned Size) const {
+ assert(Size == 4 && "Unsupported size for EmitAtomicCmpSwap.");
+
+ MachineFunction *MF = BB->getParent();
+ MachineRegisterInfo &RegInfo = MF->getRegInfo();
+ const TargetRegisterClass *RC = getRegClassFor(MVT::i32);
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ DebugLoc dl = MI->getDebugLoc();
+
+ unsigned Dest = MI->getOperand(0).getReg();
+ unsigned Ptr = MI->getOperand(1).getReg();
+ unsigned Oldval = MI->getOperand(2).getReg();
+ unsigned Newval = MI->getOperand(3).getReg();
+
+ unsigned Tmp1 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp2 = RegInfo.createVirtualRegister(RC);
+
+ // insert new blocks after the current block
+ const BasicBlock *LLVM_BB = BB->getBasicBlock();
+ MachineBasicBlock *loop1MBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *loop2MBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineFunction::iterator It = BB;
+ ++It;
+ MF->insert(It, loop1MBB);
+ MF->insert(It, loop2MBB);
+ MF->insert(It, exitMBB);
+
+ // Transfer the remainder of BB and its successor edges to exitMBB.
+ exitMBB->splice(exitMBB->begin(), BB,
+ llvm::next(MachineBasicBlock::iterator(MI)),
+ BB->end());
+ exitMBB->transferSuccessorsAndUpdatePHIs(BB);
+
+ // Get or create a temporary stack location.
+ MipsFunctionInfo *MipsFI = MF->getInfo<MipsFunctionInfo>();
+ int fi = MipsFI->getAtomicFrameIndex();
+ if (fi == -1) {
+ fi = MF->getFrameInfo()->CreateStackObject(Size, Size, false);
+ MipsFI->setAtomicFrameIndex(fi);
+ }
+
+ // thisMBB:
+ // ...
+ // sw newval, fi(sp) // store newval to stack
+ // fallthrough --> loop1MBB
+
+ // Note: storing newval to stack before the loop and then loading it from
+ // stack in block loop2MBB is necessary to prevent MachineLICM pass to
+ // hoist "or" instruction out of the block loop2MBB.
+
+ BuildMI(BB, dl, TII->get(Mips::SW))
+ .addReg(Newval).addImm(0).addFrameIndex(fi);
+ BB->addSuccessor(loop1MBB);
+
+ // loop1MBB:
+ // ll dest, 0(ptr)
+ // bne dest, oldval, exitMBB
+ BB = loop1MBB;
+ BuildMI(BB, dl, TII->get(Mips::LL), Dest).addImm(0).addReg(Ptr);
+ BuildMI(BB, dl, TII->get(Mips::BNE))
+ .addReg(Dest).addReg(Oldval).addMBB(exitMBB);
+ BB->addSuccessor(exitMBB);
+ BB->addSuccessor(loop2MBB);
+
+ // loop2MBB:
+ // lw tmp2, fi(sp) // load newval from stack
+ // or tmp1, $0, tmp2
+ // sc tmp1, 0(ptr)
+ // beq tmp1, $0, loop1MBB
+ BB = loop2MBB;
+ BuildMI(BB, dl, TII->get(Mips::LW), Tmp2).addImm(0).addFrameIndex(fi);;
+ BuildMI(BB, dl, TII->get(Mips::OR), Tmp1).addReg(Mips::ZERO).addReg(Tmp2);
+ BuildMI(BB, dl, TII->get(Mips::SC), Tmp1).addReg(Tmp1).addImm(0).addReg(Ptr);
+ BuildMI(BB, dl, TII->get(Mips::BEQ))
+ .addReg(Tmp1).addReg(Mips::ZERO).addMBB(loop1MBB);
+ BB->addSuccessor(loop1MBB);
+ BB->addSuccessor(exitMBB);
+
+ MI->eraseFromParent(); // The instruction is gone now.
+
+ return BB;
+}
+
+MachineBasicBlock *
+MipsTargetLowering::EmitAtomicCmpSwapPartword(MachineInstr *MI,
+ MachineBasicBlock *BB,
+ unsigned Size) const {
+ assert((Size == 1 || Size == 2) &&
+ "Unsupported size for EmitAtomicCmpSwapPartial.");
+
+ MachineFunction *MF = BB->getParent();
+ MachineRegisterInfo &RegInfo = MF->getRegInfo();
+ const TargetRegisterClass *RC = getRegClassFor(MVT::i32);
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ DebugLoc dl = MI->getDebugLoc();
+
+ unsigned Dest = MI->getOperand(0).getReg();
+ unsigned Ptr = MI->getOperand(1).getReg();
+ unsigned Oldval = MI->getOperand(2).getReg();
+ unsigned Newval = MI->getOperand(3).getReg();
+
+ unsigned Addr = RegInfo.createVirtualRegister(RC);
+ unsigned Shift = RegInfo.createVirtualRegister(RC);
+ unsigned Mask = RegInfo.createVirtualRegister(RC);
+ unsigned Mask2 = RegInfo.createVirtualRegister(RC);
+ unsigned Oldval2 = RegInfo.createVirtualRegister(RC);
+ unsigned Oldval3 = RegInfo.createVirtualRegister(RC);
+ unsigned Oldval4 = RegInfo.createVirtualRegister(RC);
+ unsigned Newval2 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp1 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp2 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp3 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp4 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp5 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp6 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp7 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp8 = RegInfo.createVirtualRegister(RC);
+ unsigned Tmp9 = RegInfo.createVirtualRegister(RC);
+
+ // insert new blocks after the current block
+ const BasicBlock *LLVM_BB = BB->getBasicBlock();
+ MachineBasicBlock *loop1MBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *loop2MBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
+ MachineFunction::iterator It = BB;
+ ++It;
+ MF->insert(It, loop1MBB);
+ MF->insert(It, loop2MBB);
+ MF->insert(It, exitMBB);
+
+ // Transfer the remainder of BB and its successor edges to exitMBB.
+ exitMBB->splice(exitMBB->begin(), BB,
+ llvm::next(MachineBasicBlock::iterator(MI)),
+ BB->end());
+ exitMBB->transferSuccessorsAndUpdatePHIs(BB);
+
+ // thisMBB:
+ // addiu tmp1,$0,-4 # 0xfffffffc
+ // and addr,ptr,tmp1
+ // andi tmp2,ptr,3
+ // sll shift,tmp2,3
+ // ori tmp3,$0,255 # 0xff
+ // sll mask,tmp3,shift
+ // nor mask2,$0,mask
+ // andi tmp4,oldval,255
+ // sll oldval2,tmp4,shift
+ // andi tmp5,newval,255
+ // sll newval2,tmp5,shift
+ int64_t MaskImm = (Size == 1) ? 255 : 65535;
+ BuildMI(BB, dl, TII->get(Mips::ADDiu), Tmp1).addReg(Mips::ZERO).addImm(-4);
+ BuildMI(BB, dl, TII->get(Mips::AND), Addr).addReg(Ptr).addReg(Tmp1);
+ BuildMI(BB, dl, TII->get(Mips::ANDi), Tmp2).addReg(Ptr).addImm(3);
+ BuildMI(BB, dl, TII->get(Mips::SLL), Shift).addReg(Tmp2).addImm(3);
+ BuildMI(BB, dl, TII->get(Mips::ORi), Tmp3).addReg(Mips::ZERO).addImm(MaskImm);
+ BuildMI(BB, dl, TII->get(Mips::SLL), Mask).addReg(Tmp3).addReg(Shift);
+ BuildMI(BB, dl, TII->get(Mips::NOR), Mask2).addReg(Mips::ZERO).addReg(Mask);
+ BuildMI(BB, dl, TII->get(Mips::ANDi), Tmp4).addReg(Oldval).addImm(MaskImm);
+ BuildMI(BB, dl, TII->get(Mips::SLL), Oldval2).addReg(Tmp4).addReg(Shift);
+ BuildMI(BB, dl, TII->get(Mips::ANDi), Tmp5).addReg(Newval).addImm(MaskImm);
+ BuildMI(BB, dl, TII->get(Mips::SLL), Newval2).addReg(Tmp5).addReg(Shift);
+ BB->addSuccessor(loop1MBB);
+
+ // loop1MBB:
+ // ll oldval3,0(addr)
+ // and oldval4,oldval3,mask
+ // bne oldval4,oldval2,exitMBB
+ BB = loop1MBB;
+ BuildMI(BB, dl, TII->get(Mips::LL), Oldval3).addImm(0).addReg(Addr);
+ BuildMI(BB, dl, TII->get(Mips::AND), Oldval4).addReg(Oldval3).addReg(Mask);
+ BuildMI(BB, dl, TII->get(Mips::BNE))
+ .addReg(Oldval4).addReg(Oldval2).addMBB(exitMBB);
+ BB->addSuccessor(exitMBB);
+ BB->addSuccessor(loop2MBB);
+
+ // loop2MBB:
+ // and tmp6,oldval3,mask2
+ // or tmp7,tmp6,newval2
+ // sc tmp7,0(addr)
+ // beq tmp7,$0,loop1MBB
+ BB = loop2MBB;
+ BuildMI(BB, dl, TII->get(Mips::AND), Tmp6).addReg(Oldval3).addReg(Mask2);
+ BuildMI(BB, dl, TII->get(Mips::OR), Tmp7).addReg(Tmp6).addReg(Newval2);
+ BuildMI(BB, dl, TII->get(Mips::SC), Tmp7)
+ .addReg(Tmp7).addImm(0).addReg(Addr);
+ BuildMI(BB, dl, TII->get(Mips::BEQ))
+ .addReg(Tmp7).addReg(Mips::ZERO).addMBB(loop1MBB);
+ BB->addSuccessor(loop1MBB);
+ BB->addSuccessor(exitMBB);
+
+ // exitMBB:
+ // srl tmp8,oldval4,shift
+ // sll tmp9,tmp8,24
+ // sra dest,tmp9,24
+ BB = exitMBB;
+ int64_t ShiftImm = (Size == 1) ? 24 : 16;
+ // reverse order
+ BuildMI(*BB, BB->begin(), dl, TII->get(Mips::SRA), Dest)
+ .addReg(Tmp9).addImm(ShiftImm);
+ BuildMI(*BB, BB->begin(), dl, TII->get(Mips::SLL), Tmp9)
+ .addReg(Tmp8).addImm(ShiftImm);
+ BuildMI(*BB, BB->begin(), dl, TII->get(Mips::SRL), Tmp8)
+ .addReg(Oldval4).addReg(Shift);
+
+ MI->eraseFromParent(); // The instruction is gone now.
+
+ return BB;
+}
+
//===----------------------------------------------------------------------===//
// Misc Lower Operation implementation
//===----------------------------------------------------------------------===//
projects / oota-llvm.git / blobdiff