-// $Id$
-//***************************************************************************
-// File:
-// MachineInstr.cpp
+//===-- MachineInstr.cpp --------------------------------------------------===//
//
-// Purpose:
-//
-//
-// Strategy:
-//
-// History:
-// 7/2/01 - Vikram Adve - Created
-//**************************************************************************/
+//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineInstr.h"
-#include "llvm/ConstPoolVals.h"
-#include "llvm/Instruction.h"
-#include <strstream>
-
-//************************ Class Implementations **************************/
+#include "llvm/Value.h"
+using std::cerr;
-bool
-MachineInstrInfo::constantFitsInImmedField(int64_t intValue) const
+// Constructor for instructions with fixed #operands (nearly all)
+MachineInstr::MachineInstr(MachineOpCode _opCode,
+ OpCodeMask _opCodeMask)
+ : opCode(_opCode),
+ opCodeMask(_opCodeMask),
+ operands(TargetInstrDescriptors[_opCode].numOperands)
{
- // First, check if opCode has an immed field.
- bool isSignExtended;
- uint64_t maxImmedValue = this->maxImmedConstant(isSignExtended);
- if (maxImmedValue != 0)
- {
- // Now check if the constant fits
- if (intValue <= (int64_t) maxImmedValue &&
- intValue >= -((int64_t) maxImmedValue+1))
- return true;
- }
-
- return false;
+ assert(TargetInstrDescriptors[_opCode].numOperands >= 0);
}
+// Constructor for instructions with variable #operands
MachineInstr::MachineInstr(MachineOpCode _opCode,
+ unsigned numOperands,
OpCodeMask _opCodeMask)
: opCode(_opCode),
opCodeMask(_opCodeMask),
- operands(TargetMachineInstrInfo[_opCode].numOperands)
+ operands(numOperands)
{
}
+//
+// Support for replacing opcode and operands of a MachineInstr in place.
+// This only resets the size of the operand vector and initializes it.
+// The new operands must be set explicitly later.
+//
void
-MachineInstr::SetMachineOperand(unsigned int i,
- MachineOperand::MachineOperandType operandType,
- Value* _val)
+MachineInstr::replace(MachineOpCode _opCode,
+ unsigned numOperands,
+ OpCodeMask _opCodeMask)
{
- assert(i < TargetMachineInstrInfo[opCode].numOperands);
- operands[i].Initialize(operandType, _val);
+ opCode = _opCode;
+ opCodeMask = _opCodeMask;
+ operands.clear();
+ operands.resize(numOperands);
}
void
-MachineInstr::SetMachineOperand(unsigned int i,
- MachineOperand::MachineOperandType operandType,
- int64_t intValue)
+MachineInstr::SetMachineOperandVal(unsigned int i,
+ MachineOperand::MachineOperandType opType,
+ Value* _val,
+ bool isdef,
+ bool isDefAndUse)
{
- assert(i < TargetMachineInstrInfo[opCode].numOperands);
- operands[i].InitializeConst(operandType, intValue);
+ assert(i < operands.size());
+ operands[i].Initialize(opType, _val);
+ if (isdef || TargetInstrDescriptors[opCode].resultPos == (int) i)
+ operands[i].markDef();
+ if (isDefAndUse)
+ operands[i].markDefAndUse();
}
void
-MachineInstr::SetMachineOperand(unsigned int i,
- unsigned int regNum)
+MachineInstr::SetMachineOperandConst(unsigned int i,
+ MachineOperand::MachineOperandType operandType,
+ int64_t intValue)
{
- assert(i < TargetMachineInstrInfo[opCode].numOperands);
- operands[i].InitializeReg(regNum);
+ assert(i < operands.size());
+ assert(TargetInstrDescriptors[opCode].resultPos != (int) i &&
+ "immed. constant cannot be defined");
+ operands[i].InitializeConst(operandType, intValue);
}
void
-MachineInstr::dump(unsigned int indent)
+MachineInstr::SetMachineOperandReg(unsigned int i,
+ int regNum,
+ bool isdef,
+ bool isDefAndUse,
+ bool isCCReg)
{
- for (unsigned i=0; i < indent; i++)
- cout << " ";
-
- cout << *this;
+ assert(i < operands.size());
+ operands[i].InitializeReg(regNum, isCCReg);
+ if (isdef || TargetInstrDescriptors[opCode].resultPos == (int) i)
+ operands[i].markDef();
+ if (isDefAndUse)
+ operands[i].markDefAndUse();
+ regsUsed.insert(regNum);
}
-ostream&
-operator<< (ostream& os, const MachineInstr& minstr)
+void
+MachineInstr::SetRegForOperand(unsigned i, int regNum)
{
- os << TargetMachineInstrInfo[minstr.opCode].opCodeString;
-
- for (unsigned i=0, N=minstr.getNumOperands(); i < N; i++)
- os << "\t" << minstr.getOperand(i);
-
- return os;
+ operands[i].setRegForValue(regNum);
+ regsUsed.insert(regNum);
}
-ostream&
-operator<< (ostream& os, const MachineOperand& mop)
-{
- strstream regInfo;
- if (mop.machineOperandType == MachineOperand::MO_Register)
- {
- if (mop.vregType == MachineOperand::MO_VirtualReg)
- regInfo << "(val " << mop.value << ")" << ends;
- else
- regInfo << "(" << mop.regNum << ")" << ends;
- }
- else if (mop.machineOperandType == MachineOperand::MO_CCRegister)
- regInfo << "(val " << mop.value << ")" << ends;
-
- switch(mop.machineOperandType)
- {
- case MachineOperand::MO_Register:
- os << "%reg" << regInfo.str();
- free(regInfo.str());
- break;
-
- case MachineOperand::MO_CCRegister:
- os << "%ccreg" << regInfo.str();
- free(regInfo.str());
- break;
-
- case MachineOperand::MO_SignExtendedImmed:
- os << mop.immedVal;
- break;
- case MachineOperand::MO_UnextendedImmed:
- os << mop.immedVal;
- break;
-
- case MachineOperand::MO_PCRelativeDisp:
- os << "%disp(label " << mop.value << ")";
- break;
-
- default:
- assert(0 && "Unrecognized operand type");
- break;
- }
-
- return os;
+// Subsitute all occurrences of Value* oldVal with newVal in all operands
+// and all implicit refs. If defsOnly == true, substitute defs only.
+unsigned
+MachineInstr::substituteValue(const Value* oldVal, Value* newVal, bool defsOnly)
+{
+ unsigned numSubst = 0;
+
+ // Subsitute operands
+ for (MachineInstr::val_op_iterator O = begin(), E = end(); O != E; ++O)
+ if (*O == oldVal)
+ if (!defsOnly || O.isDef())
+ {
+ O.getMachineOperand().value = newVal;
+ ++numSubst;
+ }
+
+ // Subsitute implicit refs
+ for (unsigned i=0, N=implicitRefs.size(); i < N; ++i)
+ if (implicitRefs[i] == oldVal)
+ if (!defsOnly || implicitRefIsDefined(i))
+ {
+ implicitRefs[i] = newVal;
+ ++numSubst;
+ }
+
+ return numSubst;
}
-//---------------------------------------------------------------------------
-// Target-independent utility routines for creating machine instructions
-//---------------------------------------------------------------------------
-
-
-//------------------------------------------------------------------------
-// Function Set2OperandsFromInstr
-// Function Set3OperandsFromInstr
-//
-// For the common case of 2- and 3-operand arithmetic/logical instructions,
-// set the m/c instr. operands directly from the VM instruction's operands.
-// Check whether the first or second operand is 0 and can use a dedicated "0" register.
-// Check whether the second operand should use an immediate field or register.
-// (First and third operands are never immediates for such instructions.)
-//
-// Arguments:
-// canDiscardResult: Specifies that the result operand can be discarded
-// by using the dedicated "0"
-//
-// op1position, op2position and resultPosition: Specify in which position
-// in the machine instruction the 3 operands (arg1, arg2
-// and result) should go.
-//
-// RETURN VALUE: unsigned int flags, where
-// flags & 0x01 => operand 1 is constant and needs a register
-// flags & 0x02 => operand 2 is constant and needs a register
-//------------------------------------------------------------------------
-
void
-Set2OperandsFromInstr(MachineInstr* minstr,
- InstructionNode* vmInstrNode,
- const TargetMachine& targetMachine,
- bool canDiscardResult,
- int op1Position,
- int resultPosition)
+MachineInstr::dump() const
{
- Set3OperandsFromInstr(minstr, vmInstrNode, targetMachine,
- canDiscardResult, op1Position,
- /*op2Position*/ -1, resultPosition);
+ cerr << " " << *this;
}
-
-unsigned
-Set3OperandsFromInstrJUNK(MachineInstr* minstr,
- InstructionNode* vmInstrNode,
- const TargetMachine& targetMachine,
- bool canDiscardResult,
- int op1Position,
- int op2Position,
- int resultPosition)
+static inline std::ostream&
+OutputValue(std::ostream &os, const Value* val)
{
- assert(op1Position >= 0);
- assert(resultPosition >= 0);
-
- unsigned returnFlags = 0x0;
-
- // Check if operand 1 is 0 and if so, try to use the register that gives 0, if any.
- Value* op1Value = vmInstrNode->leftChild()->getValue();
- bool isValidConstant;
- int64_t intValue = GetConstantValueAsSignedInt(op1Value, isValidConstant);
- if (isValidConstant && intValue == 0 && targetMachine.zeroRegNum >= 0)
- minstr->SetMachineOperand(op1Position, /*regNum*/ targetMachine.zeroRegNum);
+ os << "(val ";
+ if (val && val->hasName())
+ return os << val->getName() << ")";
else
- {
- if (op1Value->getValueType() == Value::ConstantVal)
- {// value is constant and must be loaded from constant pool
- returnFlags = returnFlags | (1 << op1Position);
- }
- minstr->SetMachineOperand(op1Position, MachineOperand::MO_Register,
- op1Value);
- }
-
- // Check if operand 2 (if any) fits in the immediate field of the instruction,
- // of if it is 0 and can use a dedicated machine register
- if (op2Position >= 0)
- {
- Value* op2Value = vmInstrNode->rightChild()->getValue();
- int64_t immedValue;
- MachineOperand::VirtualRegisterType vregType;
- unsigned int machineRegNum;
-
- MachineOperand::MachineOperandType
- op2type = ChooseRegOrImmed(op2Value, minstr->getOpCode(),targetMachine,
- /*canUseImmed*/ true,
- vregType, machineRegNum, immedValue);
-
- if (op2type == MachineOperand::MO_Register)
- {
- if (vregType == MachineOperand::MO_MachineReg)
- minstr->SetMachineOperand(op2Position, machineRegNum);
- else
- {
- if (op2Value->getValueType() == Value::ConstantVal)
- {// value is constant and must be loaded from constant pool
- returnFlags = returnFlags | (1 << op2Position);
- }
- minstr->SetMachineOperand(op2Position, op2type, op2Value);
- }
- }
- else
- minstr->SetMachineOperand(op2Position, op2type, immedValue);
- }
-
- // If operand 3 (result) can be discarded, use a dead register if one exists
- if (canDiscardResult && targetMachine.zeroRegNum >= 0)
- minstr->SetMachineOperand(resultPosition, targetMachine.zeroRegNum);
- else
- minstr->SetMachineOperand(resultPosition, MachineOperand::MO_Register,
- vmInstrNode->getValue());
-
- return returnFlags;
+ return os << (void*) val << ")"; // print address only
}
+static inline std::ostream&
+OutputReg(std::ostream &os, unsigned int regNum)
+{
+ return os << "%mreg(" << regNum << ")";
+}
-void
-Set3OperandsFromInstr(MachineInstr* minstr,
- InstructionNode* vmInstrNode,
- const TargetMachine& targetMachine,
- bool canDiscardResult,
- int op1Position,
- int op2Position,
- int resultPosition)
+std::ostream &operator<<(std::ostream& os, const MachineInstr& minstr)
{
- assert(op1Position >= 0);
- assert(resultPosition >= 0);
-
- // operand 1
- minstr->SetMachineOperand(op1Position, MachineOperand::MO_Register,
- vmInstrNode->leftChild()->getValue());
+ os << TargetInstrDescriptors[minstr.opCode].opCodeString;
- // operand 2 (if any)
- if (op2Position >= 0)
- minstr->SetMachineOperand(op2Position, MachineOperand::MO_Register,
- vmInstrNode->rightChild()->getValue());
+ for (unsigned i=0, N=minstr.getNumOperands(); i < N; i++) {
+ os << "\t" << minstr.getOperand(i);
+ if( minstr.operandIsDefined(i) )
+ os << "*";
+ if( minstr.operandIsDefinedAndUsed(i) )
+ os << "*";
+ }
+
+ // code for printing implict references
+ unsigned NumOfImpRefs = minstr.getNumImplicitRefs();
+ if( NumOfImpRefs > 0 ) {
+ os << "\tImplicit: ";
+ for(unsigned z=0; z < NumOfImpRefs; z++) {
+ OutputValue(os, minstr.getImplicitRef(z));
+ if( minstr.implicitRefIsDefined(z)) os << "*";
+ if( minstr.implicitRefIsDefinedAndUsed(z)) os << "*";
+ os << "\t";
+ }
+ }
- // result operand: if it can be discarded, use a dead register if one exists
- if (canDiscardResult && targetMachine.zeroRegNum >= 0)
- minstr->SetMachineOperand(resultPosition, targetMachine.zeroRegNum);
- else
- minstr->SetMachineOperand(resultPosition, MachineOperand::MO_Register,
- vmInstrNode->getValue());
+ return os << "\n";
}
-
-MachineOperand::MachineOperandType
-ChooseRegOrImmed(Value* val,
- MachineOpCode opCode,
- const TargetMachine& targetMachine,
- bool canUseImmed,
- MachineOperand::VirtualRegisterType& getVRegType,
- unsigned int& getMachineRegNum,
- int64_t& getImmedValue)
+std::ostream &operator<<(std::ostream &os, const MachineOperand &mop)
{
- MachineOperand::MachineOperandType opType = MachineOperand::MO_Register;
- getVRegType = MachineOperand::MO_VirtualReg;
- getMachineRegNum = 0;
- getImmedValue = 0;
-
- // Check for the common case first: argument is not constant
- //
- if (val->getValueType() != Value::ConstantVal)
- return opType;
-
- // Now get the constant value and check if it fits in the IMMED field.
- // Take advantage of the fact that the max unsigned value will rarely
- // fit into any IMMED field and ignore that case (i.e., cast smaller
- // unsigned constants to signed).
- //
- bool isValidConstant;
- int64_t intValue = GetConstantValueAsSignedInt(val, isValidConstant);
-
- if (isValidConstant)
+ if (mop.opHiBits32())
+ os << "%lm(";
+ else if (mop.opLoBits32())
+ os << "%lo(";
+ else if (mop.opHiBits64())
+ os << "%hh(";
+ else if (mop.opLoBits64())
+ os << "%hm(";
+
+ switch(mop.opType)
{
- if (intValue == 0 && targetMachine.zeroRegNum >= 0)
- {
- getVRegType = MachineOperand::MO_MachineReg;
- getMachineRegNum = targetMachine.zeroRegNum;
- }
- else if (canUseImmed &&
- targetMachine.machineInstrInfo[opCode].constantFitsInImmedField(intValue))
- {
- opType = MachineOperand::MO_SignExtendedImmed;
- getImmedValue = intValue;
- }
+ case MachineOperand::MO_VirtualRegister:
+ os << "%reg";
+ OutputValue(os, mop.getVRegValue());
+ if (mop.hasAllocatedReg())
+ os << "==" << OutputReg(os, mop.getAllocatedRegNum());
+ break;
+ case MachineOperand::MO_CCRegister:
+ os << "%ccreg";
+ OutputValue(os, mop.getVRegValue());
+ if (mop.hasAllocatedReg())
+ os << "==" << OutputReg(os, mop.getAllocatedRegNum());
+ break;
+ case MachineOperand::MO_MachineRegister:
+ OutputReg(os, mop.getMachineRegNum());
+ break;
+ case MachineOperand::MO_SignExtendedImmed:
+ os << (long)mop.immedVal;
+ break;
+ case MachineOperand::MO_UnextendedImmed:
+ os << (long)mop.immedVal;
+ break;
+ case MachineOperand::MO_PCRelativeDisp:
+ {
+ const Value* opVal = mop.getVRegValue();
+ bool isLabel = isa<Function>(opVal) || isa<BasicBlock>(opVal);
+ os << "%disp(" << (isLabel? "label " : "addr-of-val ");
+ if (opVal->hasName())
+ os << opVal->getName();
+ else
+ os << (const void*) opVal;
+ os << ")";
+ break;
+ }
+ default:
+ assert(0 && "Unrecognized operand type");
+ break;
}
- return opType;
+ if (mop.flags &
+ (MachineOperand::HIFLAG32 | MachineOperand::LOFLAG32 |
+ MachineOperand::HIFLAG64 | MachineOperand::LOFLAG64))
+ os << ")";
+
+ return os;
}
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