From 14be64018fb38d1fa535b9cd12d11371f4eba3b5 Mon Sep 17 00:00:00 2001 From: Alkis Evlogimenos Date: Wed, 4 Feb 2004 22:17:40 +0000 Subject: [PATCH] Modify the two address instruction pass to remove the duplicate operand of the instruction and thus simplify the register allocation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11124 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/CodeGen/MachineInstr.h | 20 ++-- include/llvm/CodeGen/MachineInstrBuilder.h | 5 +- lib/CodeGen/MachineInstr.cpp | 18 --- lib/CodeGen/RegAllocLinearScan.cpp | 56 +++++----- lib/CodeGen/TwoAddressInstructionPass.cpp | 124 +++++++++++---------- lib/Target/X86/PeepholeOptimizer.cpp | 33 ++++-- lib/Target/X86/Printer.cpp | 67 +++++------ lib/Target/X86/X86AsmPrinter.cpp | 67 +++++------ lib/Target/X86/X86CodeEmitter.cpp | 22 ++-- lib/Target/X86/X86PeepholeOpt.cpp | 33 ++++-- lib/Target/X86/X86RegisterInfo.cpp | 10 +- 11 files changed, 225 insertions(+), 230 deletions(-) diff --git a/include/llvm/CodeGen/MachineInstr.h b/include/llvm/CodeGen/MachineInstr.h index f76da2fa4a2..32e728436cc 100644 --- a/include/llvm/CodeGen/MachineInstr.h +++ b/include/llvm/CodeGen/MachineInstr.h @@ -207,10 +207,6 @@ public: return *this; } - bool operator==(const MachineOperand& rhs) const { - return regNum == rhs.regNum && opType == rhs.opType; - } - // Accessor methods. Caller is responsible for checking the // operand type before invoking the corresponding accessor. // @@ -285,14 +281,14 @@ public: return *SymbolName; } - bool isUse () const { return flags & USEFLAG; } - bool isEverUsed (const MachineInstr&) const; - bool isDef () const { return flags & DEFFLAG; } - bool isHiBits32 () const { return flags & HIFLAG32; } - bool isEverDefined (const MachineInstr&) const; - bool isLoBits32 () const { return flags & LOFLAG32; } - bool isHiBits64 () const { return flags & HIFLAG64; } - bool isLoBits64 () const { return flags & LOFLAG64; } + bool isUse () const { return flags & USEFLAG; } + MachineOperand& setUse () { flags |= USEFLAG; return *this; } + bool isDef () const { return flags & DEFFLAG; } + MachineOperand& setDef () { flags |= DEFFLAG; return *this; } + bool isHiBits32 () const { return flags & HIFLAG32; } + bool isLoBits32 () const { return flags & LOFLAG32; } + bool isHiBits64 () const { return flags & HIFLAG64; } + bool isLoBits64 () const { return flags & LOFLAG64; } // used to check if a machine register has been allocated to this operand bool hasAllocatedReg() const { diff --git a/include/llvm/CodeGen/MachineInstrBuilder.h b/include/llvm/CodeGen/MachineInstrBuilder.h index 67255214a20..e0f97361008 100644 --- a/include/llvm/CodeGen/MachineInstrBuilder.h +++ b/include/llvm/CodeGen/MachineInstrBuilder.h @@ -138,9 +138,10 @@ inline MachineInstrBuilder BuildMI(int Opcode, unsigned NumOperands) { /// calls that are expected, it does not include the destination register. /// inline MachineInstrBuilder BuildMI(int Opcode, unsigned NumOperands, - unsigned DestReg) { + unsigned DestReg, + MOTy::UseType useType = MOTy::Def) { return MachineInstrBuilder(new MachineInstr(Opcode, NumOperands+1, - true, true)).addReg(DestReg, MOTy::Def); + true, true)).addReg(DestReg, useType); } diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp index 869d963d53d..9d7b1b2d99f 100644 --- a/lib/CodeGen/MachineInstr.cpp +++ b/lib/CodeGen/MachineInstr.cpp @@ -27,24 +27,6 @@ namespace llvm { // extern const TargetInstrDescriptor *TargetInstrDescriptors; -bool MachineOperand::isEverUsed(const MachineInstr& mi) const -{ - for (int i = 0, e = mi.getNumOperands(); i != e; ++i) { - if (*this == mi.getOperand(i) && mi.getOperand(i).isUse()) - return true; - } - return false; -} - -bool MachineOperand::isEverDefined(const MachineInstr& mi) const -{ - for (int i = 0, e = mi.getNumOperands(); i != e; ++i) { - if (*this == mi.getOperand(i) && mi.getOperand(i).isDef()) - return true; - } - return false; -} - // Constructor for instructions with variable #operands MachineInstr::MachineInstr(MachineOpCode OpCode, unsigned numOperands) : opCode(OpCode), diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp index b71a1386162..7a7c1c0bb9a 100644 --- a/lib/CodeGen/RegAllocLinearScan.cpp +++ b/lib/CodeGen/RegAllocLinearScan.cpp @@ -109,10 +109,6 @@ namespace { typedef std::vector IntervalPtrs; IntervalPtrs unhandled_, fixed_, active_, inactive_; - typedef std::vector Regs; - Regs tempUseOperands_; - Regs tempDefOperands_; - PhysRegTracker prt_; typedef std::map Virt2PhysMap; @@ -428,7 +424,6 @@ bool RA::runOnMachineFunction(MachineFunction &fn) { for (currentInstr_ = currentMbb_->begin(); currentInstr_ != currentMbb_->end(); ) { - DEBUG(std::cerr << "\tinstruction: "; (*currentInstr_)->print(std::cerr, *tm_);); @@ -465,13 +460,17 @@ bool RA::runOnMachineFunction(MachineFunction &fn) { continue; } + typedef std::vector Regs; + Regs toClear; + Regs toSpill; + + const unsigned numOperands = (*currentInstr_)->getNumOperands(); + DEBUG(std::cerr << "\t\tloading temporarily used operands to " "registers:\n"); - for (unsigned i = 0, e = (*currentInstr_)->getNumOperands(); - i != e; ++i) { + for (unsigned i = 0; i != numOperands; ++i) { MachineOperand& op = (*currentInstr_)->getOperand(i); - if (op.isVirtualRegister() && op.isUse() && - !op.isEverDefined(**currentInstr_)) { + if (op.isVirtualRegister() && op.isUse()) { unsigned virtReg = op.getAllocatedRegNum(); unsigned physReg = 0; Virt2PhysMap::const_iterator it = v2pMap_.find(virtReg); @@ -481,26 +480,28 @@ bool RA::runOnMachineFunction(MachineFunction &fn) { else { physReg = getFreeTempPhysReg(virtReg); loadVirt2PhysReg(virtReg, physReg); - tempUseOperands_.push_back(virtReg); + // we will clear uses that are not also defs + // before we allocate registers the defs + if (op.isDef()) + toSpill.push_back(virtReg); + else + toClear.push_back(virtReg); } (*currentInstr_)->SetMachineOperandReg(i, physReg); } } - DEBUG(std::cerr << "\t\tclearing temporarily used operands:\n"); - for (unsigned i = 0, e = tempUseOperands_.size(); i != e; ++i) { - clearVirtReg(tempUseOperands_[i]); - } - tempUseOperands_.clear(); + DEBUG(std::cerr << "\t\tclearing temporarily used but not defined " + "operands:\n"); + std::for_each(toClear.begin(), toClear.end(), + std::bind1st(std::mem_fun(&RA::clearVirtReg), this)); DEBUG(std::cerr << "\t\tassigning temporarily defined operands to " "registers:\n"); - for (unsigned i = 0, e = (*currentInstr_)->getNumOperands(); - i != e; ++i) { + for (unsigned i = 0; i != numOperands; ++i) { MachineOperand& op = (*currentInstr_)->getOperand(i); if (op.isVirtualRegister()) { - assert(op.isEverDefined(**currentInstr_) && - "operand should be defined by this instruction"); + assert(!op.isUse() && "we should not have uses here!"); unsigned virtReg = op.getAllocatedRegNum(); unsigned physReg = 0; Virt2PhysMap::const_iterator it = v2pMap_.find(virtReg); @@ -510,21 +511,18 @@ bool RA::runOnMachineFunction(MachineFunction &fn) { else { physReg = getFreeTempPhysReg(virtReg); assignVirt2PhysReg(virtReg, physReg); - tempDefOperands_.push_back(virtReg); + // need to spill this after we are done with + // this instruction + toSpill.push_back(virtReg); } (*currentInstr_)->SetMachineOperandReg(i, physReg); } } + ++currentInstr_; // spills will go after this instruction - DEBUG(std::cerr << "\t\tspilling temporarily defined operands " - "of this instruction:\n"); - ++currentInstr_; // we want to insert after this instruction - for (unsigned i = 0, e = tempDefOperands_.size(); i != e; ++i) { - spillVirtReg(tempDefOperands_[i]); - } - --currentInstr_; // restore currentInstr_ iterator - tempDefOperands_.clear(); - ++currentInstr_; + DEBUG(std::cerr << "\t\tspilling temporarily defined operands:\n"); + std::for_each(toSpill.begin(), toSpill.end(), + std::bind1st(std::mem_fun(&RA::spillVirtReg), this)); } } diff --git a/lib/CodeGen/TwoAddressInstructionPass.cpp b/lib/CodeGen/TwoAddressInstructionPass.cpp index 991be42e531..dd94d40d8b3 100644 --- a/lib/CodeGen/TwoAddressInstructionPass.cpp +++ b/lib/CodeGen/TwoAddressInstructionPass.cpp @@ -16,11 +16,14 @@ // to: // // A = B -// A = A op C +// A op= C // -// Note that if a register allocator chooses to use this pass, that it has to -// be capable of handling the non-SSA nature of these rewritten virtual -// registers. +// Note that if a register allocator chooses to use this pass, that it +// has to be capable of handling the non-SSA nature of these rewritten +// virtual registers. +// +// It is also worth noting that the duplicate operand of the two +// address instruction is removed. // //===----------------------------------------------------------------------===// @@ -98,63 +101,70 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) { mi->getOperand(1).isUse() && "two address instruction invalid"); - // we have nothing to do if the two operands are the same + // if the two operands are the same we just remove the use + // and mark the def as def&use if (mi->getOperand(0).getAllocatedRegNum() == - mi->getOperand(1).getAllocatedRegNum()) - continue; - - MadeChange = true; - - // rewrite: - // a = b op c - // to: - // a = b - // a = a op c - unsigned regA = mi->getOperand(0).getAllocatedRegNum(); - unsigned regB = mi->getOperand(1).getAllocatedRegNum(); - - assert(MRegisterInfo::isVirtualRegister(regA) && - MRegisterInfo::isVirtualRegister(regB) && - "cannot update physical register live information"); - - // first make sure we do not have a use of a in the - // instruction (a = b + a for example) because our - // transformation will not work. This should never occur - // because we are in SSA form. - for (unsigned i = 1; i != mi->getNumOperands(); ++i) - assert(!mi->getOperand(i).isRegister() || - mi->getOperand(i).getAllocatedRegNum() != (int)regA); - - const TargetRegisterClass* rc =MF.getSSARegMap()->getRegClass(regA); - unsigned Added = MRI.copyRegToReg(*mbbi, mii, regA, regB, rc); - numInstrsAdded += Added; - - MachineInstr* prevMi = *(mii - 1); - DEBUG(std::cerr << "\t\tadded instruction: "; - prevMi->print(std::cerr, TM)); - - // update live variables for regA - assert(Added == 1 && "Cannot handle multi-instruction copies yet!"); - LiveVariables::VarInfo& varInfo = LV.getVarInfo(regA); - varInfo.DefInst = prevMi; - - // update live variables for regB - if (LV.removeVirtualRegisterKilled(regB, &*mbbi, mi)) - LV.addVirtualRegisterKilled(regB, &*mbbi, prevMi); - - if (LV.removeVirtualRegisterDead(regB, &*mbbi, mi)) - LV.addVirtualRegisterDead(regB, &*mbbi, prevMi); - - // replace all occurences of regB with regA - for (unsigned i = 1; i < mi->getNumOperands(); ++i) { - if (mi->getOperand(i).isRegister() && - mi->getOperand(i).getReg() == regB) - mi->SetMachineOperandReg(i, regA); + mi->getOperand(1).getAllocatedRegNum()) { } + else { + MadeChange = true; + + // rewrite: + // a = b op c + // to: + // a = b + // a = a op c + unsigned regA = mi->getOperand(0).getAllocatedRegNum(); + unsigned regB = mi->getOperand(1).getAllocatedRegNum(); + + assert(MRegisterInfo::isVirtualRegister(regA) && + MRegisterInfo::isVirtualRegister(regB) && + "cannot update physical register live information"); + + // first make sure we do not have a use of a in the + // instruction (a = b + a for example) because our + // transformation will not work. This should never occur + // because we are in SSA form. + for (unsigned i = 1; i != mi->getNumOperands(); ++i) + assert(!mi->getOperand(i).isRegister() || + mi->getOperand(i).getAllocatedRegNum() != (int)regA); + + const TargetRegisterClass* rc = + MF.getSSARegMap()->getRegClass(regA); + unsigned Added = MRI.copyRegToReg(*mbbi, mii, regA, regB, rc); + numInstrsAdded += Added; + + MachineInstr* prevMi = *(mii - 1); + DEBUG(std::cerr << "\t\tadded instruction: "; + prevMi->print(std::cerr, TM)); + + // update live variables for regA + assert(Added == 1 && + "Cannot handle multi-instruction copies yet!"); + LiveVariables::VarInfo& varInfo = LV.getVarInfo(regA); + varInfo.DefInst = prevMi; + + // update live variables for regB + if (LV.removeVirtualRegisterKilled(regB, &*mbbi, mi)) + LV.addVirtualRegisterKilled(regB, &*mbbi, prevMi); + + if (LV.removeVirtualRegisterDead(regB, &*mbbi, mi)) + LV.addVirtualRegisterDead(regB, &*mbbi, prevMi); + + // replace all occurences of regB with regA + for (unsigned i = 1, e = mi->getNumOperands(); i != e; ++i) { + if (mi->getOperand(i).isRegister() && + mi->getOperand(i).getReg() == regB) + mi->SetMachineOperandReg(i, regA); + } + } + + assert(mi->getOperand(0).isDef()); + mi->getOperand(0).setUse(); + mi->RemoveOperand(1); + DEBUG(std::cerr << "\t\tmodified original to: "; mi->print(std::cerr, TM)); - assert(mi->getOperand(0).getAllocatedRegNum() == - mi->getOperand(1).getAllocatedRegNum()); } } diff --git a/lib/Target/X86/PeepholeOptimizer.cpp b/lib/Target/X86/PeepholeOptimizer.cpp index 89008aeeca0..6d07ec502a7 100644 --- a/lib/Target/X86/PeepholeOptimizer.cpp +++ b/lib/Target/X86/PeepholeOptimizer.cpp @@ -67,15 +67,35 @@ bool PH::PeepholeOptimize(MachineBasicBlock &MBB, // immediate despite the fact that the operands are 16 or 32 bits. Because // this can save three bytes of code size (and icache space), we want to // shrink them if possible. + case X86::IMULri16: case X86::IMULri32: + assert(MI->getNumOperands() == 3 && "These should all have 3 operands!"); + if (MI->getOperand(2).isImmediate()) { + int Val = MI->getOperand(2).getImmedValue(); + // If the value is the same when signed extended from 8 bits... + if (Val == (signed int)(signed char)Val) { + unsigned Opcode; + switch (MI->getOpcode()) { + default: assert(0 && "Unknown opcode value!"); + case X86::IMULri16: Opcode = X86::IMULri16b; break; + case X86::IMULri32: Opcode = X86::IMULri32b; break; + } + unsigned R0 = MI->getOperand(0).getReg(); + unsigned R1 = MI->getOperand(1).getReg(); + *I = BuildMI(Opcode, 2, R0).addReg(R1).addZImm((char)Val); + delete MI; + return true; + } + } + return false; + case X86::ADDri16: case X86::ADDri32: case X86::SUBri16: case X86::SUBri32: - case X86::IMULri16: case X86::IMULri32: case X86::ANDri16: case X86::ANDri32: case X86::ORri16: case X86::ORri32: case X86::XORri16: case X86::XORri32: - assert(MI->getNumOperands() == 3 && "These should all have 3 operands!"); - if (MI->getOperand(2).isImmediate()) { - int Val = MI->getOperand(2).getImmedValue(); + assert(MI->getNumOperands() == 2 && "These should all have 2 operands!"); + if (MI->getOperand(1).isImmediate()) { + int Val = MI->getOperand(1).getImmedValue(); // If the value is the same when signed extended from 8 bits... if (Val == (signed int)(signed char)Val) { unsigned Opcode; @@ -85,8 +105,6 @@ bool PH::PeepholeOptimize(MachineBasicBlock &MBB, case X86::ADDri32: Opcode = X86::ADDri32b; break; case X86::SUBri16: Opcode = X86::SUBri16b; break; case X86::SUBri32: Opcode = X86::SUBri32b; break; - case X86::IMULri16: Opcode = X86::IMULri16b; break; - case X86::IMULri32: Opcode = X86::IMULri32b; break; case X86::ANDri16: Opcode = X86::ANDri16b; break; case X86::ANDri32: Opcode = X86::ANDri32b; break; case X86::ORri16: Opcode = X86::ORri16b; break; @@ -95,8 +113,7 @@ bool PH::PeepholeOptimize(MachineBasicBlock &MBB, case X86::XORri32: Opcode = X86::XORri32b; break; } unsigned R0 = MI->getOperand(0).getReg(); - unsigned R1 = MI->getOperand(1).getReg(); - *I = BuildMI(Opcode, 2, R0).addReg(R1).addZImm((char)Val); + *I = BuildMI(Opcode, 1, R0, MOTy::UseAndDef).addZImm((char)Val); delete MI; return true; } diff --git a/lib/Target/X86/Printer.cpp b/lib/Target/X86/Printer.cpp index 7cd4573ff66..c410d8bed70 100644 --- a/lib/Target/X86/Printer.cpp +++ b/lib/Target/X86/Printer.cpp @@ -609,35 +609,31 @@ void Printer::printMachineInstruction(const MachineInstr *MI) { return; } case X86II::MRMDestReg: { - // There are two acceptable forms of MRMDestReg instructions, those with 2, - // 3 and 4 operands: + // There are three forms of MRMDestReg instructions, those with 2 + // or 3 operands: // - // 2 Operands: this is for things like mov that do not read a second input + // 2 Operands: this is for things like mov that do not read a + // second input. // - // 3 Operands: in this form, the first two registers (the destination, and - // the first operand) should be the same, post register allocation. The 3rd - // operand is an additional input. This should be for things like add - // instructions. + // 2 Operands: two address instructions which def&use the first + // argument and use the second as input. // - // 4 Operands: This form is for instructions which are 3 operands forms, but - // have a constant argument as well. + // 3 Operands: in this form, two address instructions are the same + // as in 2 but have a constant argument as well. // bool isTwoAddr = TII.isTwoAddrInstr(Opcode); assert(MI->getOperand(0).isRegister() && (MI->getNumOperands() == 2 || - (isTwoAddr && MI->getOperand(1).isRegister() && - MI->getOperand(0).getReg() == MI->getOperand(1).getReg() && - (MI->getNumOperands() == 3 || - (MI->getNumOperands() == 4 && MI->getOperand(3).isImmediate())))) + (MI->getNumOperands() == 3 && MI->getOperand(2).isImmediate())) && "Bad format for MRMDestReg!"); O << TII.getName(MI->getOpCode()) << " "; printOp(MI->getOperand(0)); O << ", "; - printOp(MI->getOperand(1+isTwoAddr)); - if (MI->getNumOperands() == 4) { + printOp(MI->getOperand(1)); + if (MI->getNumOperands() == 3) { O << ", "; - printOp(MI->getOperand(3)); + printOp(MI->getOperand(2)); } O << "\n"; return; @@ -659,40 +655,35 @@ void Printer::printMachineInstruction(const MachineInstr *MI) { } case X86II::MRMSrcReg: { - // There are three forms that are acceptable for MRMSrcReg instructions, - // those with 3 and 2 operands: + // There are three forms that are acceptable for MRMSrcReg + // instructions, those with 2 or 3 operands: // - // 3 Operands: in this form, the last register (the second input) is the - // ModR/M input. The first two operands should be the same, post register - // allocation. This is for things like: add r32, r/m32 + // 2 Operands: this is for things like mov that do not read a + // second input. + // + // 2 Operands: in this form, the last register is the ModR/M + // input. The first operand is a def&use. This is for things + // like: add r32, r/m32 // // 3 Operands: in this form, we can have 'INST R1, R2, imm', which is used // for instructions like the IMULri instructions. // - // 2 Operands: this is for things like mov that do not read a second input // assert(MI->getOperand(0).isRegister() && MI->getOperand(1).isRegister() && - (MI->getNumOperands() == 2 || - (MI->getNumOperands() == 3 && - (MI->getOperand(2).isRegister() || - MI->getOperand(2).isImmediate()))) + (MI->getNumOperands() == 2 || + (MI->getNumOperands() == 3 && + (MI->getOperand(2).isImmediate()))) && "Bad format for MRMSrcReg!"); - if (MI->getNumOperands() == 3 && !MI->getOperand(2).isImmediate() && - MI->getOperand(0).getReg() != MI->getOperand(1).getReg()) - O << "**"; O << TII.getName(MI->getOpCode()) << " "; printOp(MI->getOperand(0)); - - // If this is IMULri* instructions, print the non-two-address operand. - if (MI->getNumOperands() == 3 && MI->getOperand(2).isImmediate()) { - O << ", "; - printOp(MI->getOperand(1)); - } - O << ", "; - printOp(MI->getOperand(MI->getNumOperands()-1)); + printOp(MI->getOperand(1)); + if (MI->getNumOperands() == 3) { + O << ", "; + printOp(MI->getOperand(2)); + } O << "\n"; return; } @@ -705,7 +696,7 @@ void Printer::printMachineInstruction(const MachineInstr *MI) { (MI->getNumOperands() == 1+4 && isMem(MI, 1)) || (MI->getNumOperands() == 2+4 && MI->getOperand(1).isRegister() && isMem(MI, 2)) - && "Bad format for MRMDestReg!"); + && "Bad format for MRMSrcMem!"); if (MI->getNumOperands() == 2+4 && MI->getOperand(0).getReg() != MI->getOperand(1).getReg()) O << "**"; diff --git a/lib/Target/X86/X86AsmPrinter.cpp b/lib/Target/X86/X86AsmPrinter.cpp index 7cd4573ff66..c410d8bed70 100644 --- a/lib/Target/X86/X86AsmPrinter.cpp +++ b/lib/Target/X86/X86AsmPrinter.cpp @@ -609,35 +609,31 @@ void Printer::printMachineInstruction(const MachineInstr *MI) { return; } case X86II::MRMDestReg: { - // There are two acceptable forms of MRMDestReg instructions, those with 2, - // 3 and 4 operands: + // There are three forms of MRMDestReg instructions, those with 2 + // or 3 operands: // - // 2 Operands: this is for things like mov that do not read a second input + // 2 Operands: this is for things like mov that do not read a + // second input. // - // 3 Operands: in this form, the first two registers (the destination, and - // the first operand) should be the same, post register allocation. The 3rd - // operand is an additional input. This should be for things like add - // instructions. + // 2 Operands: two address instructions which def&use the first + // argument and use the second as input. // - // 4 Operands: This form is for instructions which are 3 operands forms, but - // have a constant argument as well. + // 3 Operands: in this form, two address instructions are the same + // as in 2 but have a constant argument as well. // bool isTwoAddr = TII.isTwoAddrInstr(Opcode); assert(MI->getOperand(0).isRegister() && (MI->getNumOperands() == 2 || - (isTwoAddr && MI->getOperand(1).isRegister() && - MI->getOperand(0).getReg() == MI->getOperand(1).getReg() && - (MI->getNumOperands() == 3 || - (MI->getNumOperands() == 4 && MI->getOperand(3).isImmediate())))) + (MI->getNumOperands() == 3 && MI->getOperand(2).isImmediate())) && "Bad format for MRMDestReg!"); O << TII.getName(MI->getOpCode()) << " "; printOp(MI->getOperand(0)); O << ", "; - printOp(MI->getOperand(1+isTwoAddr)); - if (MI->getNumOperands() == 4) { + printOp(MI->getOperand(1)); + if (MI->getNumOperands() == 3) { O << ", "; - printOp(MI->getOperand(3)); + printOp(MI->getOperand(2)); } O << "\n"; return; @@ -659,40 +655,35 @@ void Printer::printMachineInstruction(const MachineInstr *MI) { } case X86II::MRMSrcReg: { - // There are three forms that are acceptable for MRMSrcReg instructions, - // those with 3 and 2 operands: + // There are three forms that are acceptable for MRMSrcReg + // instructions, those with 2 or 3 operands: // - // 3 Operands: in this form, the last register (the second input) is the - // ModR/M input. The first two operands should be the same, post register - // allocation. This is for things like: add r32, r/m32 + // 2 Operands: this is for things like mov that do not read a + // second input. + // + // 2 Operands: in this form, the last register is the ModR/M + // input. The first operand is a def&use. This is for things + // like: add r32, r/m32 // // 3 Operands: in this form, we can have 'INST R1, R2, imm', which is used // for instructions like the IMULri instructions. // - // 2 Operands: this is for things like mov that do not read a second input // assert(MI->getOperand(0).isRegister() && MI->getOperand(1).isRegister() && - (MI->getNumOperands() == 2 || - (MI->getNumOperands() == 3 && - (MI->getOperand(2).isRegister() || - MI->getOperand(2).isImmediate()))) + (MI->getNumOperands() == 2 || + (MI->getNumOperands() == 3 && + (MI->getOperand(2).isImmediate()))) && "Bad format for MRMSrcReg!"); - if (MI->getNumOperands() == 3 && !MI->getOperand(2).isImmediate() && - MI->getOperand(0).getReg() != MI->getOperand(1).getReg()) - O << "**"; O << TII.getName(MI->getOpCode()) << " "; printOp(MI->getOperand(0)); - - // If this is IMULri* instructions, print the non-two-address operand. - if (MI->getNumOperands() == 3 && MI->getOperand(2).isImmediate()) { - O << ", "; - printOp(MI->getOperand(1)); - } - O << ", "; - printOp(MI->getOperand(MI->getNumOperands()-1)); + printOp(MI->getOperand(1)); + if (MI->getNumOperands() == 3) { + O << ", "; + printOp(MI->getOperand(2)); + } O << "\n"; return; } @@ -705,7 +696,7 @@ void Printer::printMachineInstruction(const MachineInstr *MI) { (MI->getNumOperands() == 1+4 && isMem(MI, 1)) || (MI->getNumOperands() == 2+4 && MI->getOperand(1).isRegister() && isMem(MI, 2)) - && "Bad format for MRMDestReg!"); + && "Bad format for MRMSrcMem!"); if (MI->getNumOperands() == 2+4 && MI->getOperand(0).getReg() != MI->getOperand(1).getReg()) O << "**"; diff --git a/lib/Target/X86/X86CodeEmitter.cpp b/lib/Target/X86/X86CodeEmitter.cpp index 13e9d762f5d..516f1d27256 100644 --- a/lib/Target/X86/X86CodeEmitter.cpp +++ b/lib/Target/X86/X86CodeEmitter.cpp @@ -548,10 +548,10 @@ void Emitter::emitInstruction(MachineInstr &MI) { case X86II::MRMDestReg: { MCE.emitByte(BaseOpcode); - MachineOperand &SrcOp = MI.getOperand(1+II->isTwoAddrInstr(Opcode)); - emitRegModRMByte(MI.getOperand(0).getReg(), getX86RegNum(SrcOp.getReg())); - if (MI.getNumOperands() == 4) - emitConstant(MI.getOperand(3).getImmedValue(), sizeOfPtr(Desc)); + emitRegModRMByte(MI.getOperand(0).getReg(), + getX86RegNum(MI.getOperand(1).getReg())); + if (MI.getNumOperands() == 3) + emitConstant(MI.getOperand(2).getImmedValue(), sizeOfPtr(Desc)); break; } case X86II::MRMDestMem: @@ -562,18 +562,10 @@ void Emitter::emitInstruction(MachineInstr &MI) { case X86II::MRMSrcReg: MCE.emitByte(BaseOpcode); - if (MI.getNumOperands() == 2) { - emitRegModRMByte(MI.getOperand(MI.getNumOperands()-1).getReg(), - getX86RegNum(MI.getOperand(0).getReg())); - } else if (MI.getOperand(2).isImmediate()) { - emitRegModRMByte(MI.getOperand(1).getReg(), - getX86RegNum(MI.getOperand(0).getReg())); - + emitRegModRMByte(MI.getOperand(1).getReg(), + getX86RegNum(MI.getOperand(0).getReg())); + if (MI.getNumOperands() == 3) emitConstant(MI.getOperand(2).getImmedValue(), sizeOfPtr(Desc)); - } else { - emitRegModRMByte(MI.getOperand(2).getReg(), - getX86RegNum(MI.getOperand(0).getReg())); - } break; case X86II::MRMSrcMem: diff --git a/lib/Target/X86/X86PeepholeOpt.cpp b/lib/Target/X86/X86PeepholeOpt.cpp index 89008aeeca0..6d07ec502a7 100644 --- a/lib/Target/X86/X86PeepholeOpt.cpp +++ b/lib/Target/X86/X86PeepholeOpt.cpp @@ -67,15 +67,35 @@ bool PH::PeepholeOptimize(MachineBasicBlock &MBB, // immediate despite the fact that the operands are 16 or 32 bits. Because // this can save three bytes of code size (and icache space), we want to // shrink them if possible. + case X86::IMULri16: case X86::IMULri32: + assert(MI->getNumOperands() == 3 && "These should all have 3 operands!"); + if (MI->getOperand(2).isImmediate()) { + int Val = MI->getOperand(2).getImmedValue(); + // If the value is the same when signed extended from 8 bits... + if (Val == (signed int)(signed char)Val) { + unsigned Opcode; + switch (MI->getOpcode()) { + default: assert(0 && "Unknown opcode value!"); + case X86::IMULri16: Opcode = X86::IMULri16b; break; + case X86::IMULri32: Opcode = X86::IMULri32b; break; + } + unsigned R0 = MI->getOperand(0).getReg(); + unsigned R1 = MI->getOperand(1).getReg(); + *I = BuildMI(Opcode, 2, R0).addReg(R1).addZImm((char)Val); + delete MI; + return true; + } + } + return false; + case X86::ADDri16: case X86::ADDri32: case X86::SUBri16: case X86::SUBri32: - case X86::IMULri16: case X86::IMULri32: case X86::ANDri16: case X86::ANDri32: case X86::ORri16: case X86::ORri32: case X86::XORri16: case X86::XORri32: - assert(MI->getNumOperands() == 3 && "These should all have 3 operands!"); - if (MI->getOperand(2).isImmediate()) { - int Val = MI->getOperand(2).getImmedValue(); + assert(MI->getNumOperands() == 2 && "These should all have 2 operands!"); + if (MI->getOperand(1).isImmediate()) { + int Val = MI->getOperand(1).getImmedValue(); // If the value is the same when signed extended from 8 bits... if (Val == (signed int)(signed char)Val) { unsigned Opcode; @@ -85,8 +105,6 @@ bool PH::PeepholeOptimize(MachineBasicBlock &MBB, case X86::ADDri32: Opcode = X86::ADDri32b; break; case X86::SUBri16: Opcode = X86::SUBri16b; break; case X86::SUBri32: Opcode = X86::SUBri32b; break; - case X86::IMULri16: Opcode = X86::IMULri16b; break; - case X86::IMULri32: Opcode = X86::IMULri32b; break; case X86::ANDri16: Opcode = X86::ANDri16b; break; case X86::ANDri32: Opcode = X86::ANDri32b; break; case X86::ORri16: Opcode = X86::ORri16b; break; @@ -95,8 +113,7 @@ bool PH::PeepholeOptimize(MachineBasicBlock &MBB, case X86::XORri32: Opcode = X86::XORri32b; break; } unsigned R0 = MI->getOperand(0).getReg(); - unsigned R1 = MI->getOperand(1).getReg(); - *I = BuildMI(Opcode, 2, R0).addReg(R1).addZImm((char)Val); + *I = BuildMI(Opcode, 1, R0, MOTy::UseAndDef).addZImm((char)Val); delete MI; return true; } diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp index 0e8b889ad8d..9b362be8c54 100644 --- a/lib/Target/X86/X86RegisterInfo.cpp +++ b/lib/Target/X86/X86RegisterInfo.cpp @@ -110,10 +110,10 @@ int X86RegisterInfo::eliminateCallFramePseudoInstr(MachineFunction &MF, Amount = (Amount+Align-1)/Align*Align; if (Old->getOpcode() == X86::ADJCALLSTACKDOWN) { - New=BuildMI(X86::SUBri32, 2, X86::ESP).addReg(X86::ESP).addZImm(Amount); + New=BuildMI(X86::SUBri32, 1, X86::ESP, MOTy::UseAndDef).addZImm(Amount); } else { assert(Old->getOpcode() == X86::ADJCALLSTACKUP); - New=BuildMI(X86::ADDri32, 2, X86::ESP).addReg(X86::ESP).addZImm(Amount); + New=BuildMI(X86::ADDri32, 1, X86::ESP, MOTy::UseAndDef).addZImm(Amount); } } } @@ -181,7 +181,7 @@ int X86RegisterInfo::emitPrologue(MachineFunction &MF) const { int EBPOffset = MFI->getObjectOffset(MFI->getObjectIndexEnd()-1)+4; if (NumBytes) { // adjust stack pointer: ESP -= numbytes - MI= BuildMI(X86::SUBri32, 2, X86::ESP).addReg(X86::ESP).addZImm(NumBytes); + MI= BuildMI(X86::SUBri32, 1, X86::ESP, MOTy::UseAndDef).addZImm(NumBytes); MBBI = MBB.insert(MBBI, MI)+1; } @@ -215,7 +215,7 @@ int X86RegisterInfo::emitPrologue(MachineFunction &MF) const { if (NumBytes) { // adjust stack pointer: ESP -= numbytes - MI= BuildMI(X86::SUBri32, 2, X86::ESP).addReg(X86::ESP).addZImm(NumBytes); + MI= BuildMI(X86::SUBri32, 1, X86::ESP, MOTy::UseAndDef).addZImm(NumBytes); MBB.insert(MBBI, MI); } } @@ -248,7 +248,7 @@ int X86RegisterInfo::emitEpilogue(MachineFunction &MF, unsigned NumBytes = MFI->getStackSize(); if (NumBytes) { // adjust stack pointer back: ESP += numbytes - MI =BuildMI(X86::ADDri32, 2, X86::ESP).addReg(X86::ESP).addZImm(NumBytes); + MI =BuildMI(X86::ADDri32, 1, X86::ESP, MOTy::UseAndDef).addZImm(NumBytes); MBBI = 1+MBB.insert(MBBI, MI); } } -- 2.34.1