public static x86Instruction Create(x86OpCode opCode, params Ix86Operand[] operands)
{
var ret = new x86Instruction();
ret.OpCode = opCode;
ret.Operands = operands;
return(ret);
}
public static x86Instruction Create(x86OpCode opCode, params Ix86Operand[] operands)
{
var ret = new x86Instruction();
ret.OpCode = opCode;
ret.Operands = operands;
return ret;
}
private x86Register Normalize(x86Instruction instr)
{
if (instr.Operands.Length == 2 &&
instr.Operands[0] is x86ImmediateOperand &&
instr.Operands[1] is x86ImmediateOperand) {
/*
* op imm1, imm2
* ==>
* mov reg, imm1
* op reg, imm2
*/
x86Register reg = GetFreeRegister();
instrs.Add(x86Instruction.Create(x86OpCode.MOV, new x86RegisterOperand(reg), instr.Operands[0]));
instr.Operands[0] = new x86RegisterOperand(reg);
instrs.Add(instr);
return reg;
}
if (instr.Operands.Length == 1 &&
instr.Operands[0] is x86ImmediateOperand) {
/*
* op imm
* ==>
* mov reg, imm
* op reg
*/
x86Register reg = GetFreeRegister();
instrs.Add(x86Instruction.Create(x86OpCode.MOV, new x86RegisterOperand(reg), instr.Operands[0]));
instr.Operands[0] = new x86RegisterOperand(reg);
instrs.Add(instr);
return reg;
}
if (instr.OpCode == x86OpCode.SUB &&
instr.Operands[0] is x86ImmediateOperand &&
instr.Operands[1] is x86RegisterOperand) {
/*
* sub imm, reg
* ==>
* neg reg
* add reg, imm
*/
x86Register reg = ((x86RegisterOperand)instr.Operands[1]).Register;
instrs.Add(x86Instruction.Create(x86OpCode.NEG, new x86RegisterOperand(reg)));
instr.OpCode = x86OpCode.ADD;
instr.Operands[1] = instr.Operands[0];
instr.Operands[0] = new x86RegisterOperand(reg);
instrs.Add(instr);
return reg;
}
if (instr.Operands.Length == 2 &&
instr.Operands[0] is x86ImmediateOperand &&
instr.Operands[1] is x86RegisterOperand) {
/*
* op imm, reg
* ==>
* op reg, imm
*/
x86Register reg = ((x86RegisterOperand)instr.Operands[1]).Register;
instr.Operands[1] = instr.Operands[0];
instr.Operands[0] = new x86RegisterOperand(reg);
instrs.Add(instr);
return reg;
}
Debug.Assert(instr.Operands.Length > 0);
Debug.Assert(instr.Operands[0] is x86RegisterOperand);
if (instr.Operands.Length == 2 && instr.Operands[1] is x86RegisterOperand)
ReleaseRegister(((x86RegisterOperand)instr.Operands[1]).Register);
instrs.Add(instr);
return ((x86RegisterOperand)instr.Operands[0]).Register;
}
x86Register Normalize(x86Instruction instr)
{
if (instr.Operands.Length == 2 &&
instr.Operands[0] is x86ImmediateOperand &&
instr.Operands[1] is x86ImmediateOperand)
{
/*
* op imm1, imm2
* ==>
* mov reg, imm1
* op reg, imm2
*/
x86Register reg = GetFreeRegister();
instrs.Add(x86Instruction.Create(x86OpCode.MOV, new x86RegisterOperand(reg), instr.Operands[0]));
instr.Operands[0] = new x86RegisterOperand(reg);
instrs.Add(instr);
return(reg);
}
if (instr.Operands.Length == 1 &&
instr.Operands[0] is x86ImmediateOperand)
{
/*
* op imm
* ==>
* mov reg, imm
* op reg
*/
x86Register reg = GetFreeRegister();
instrs.Add(x86Instruction.Create(x86OpCode.MOV, new x86RegisterOperand(reg), instr.Operands[0]));
instr.Operands[0] = new x86RegisterOperand(reg);
instrs.Add(instr);
return(reg);
}
if (instr.OpCode == x86OpCode.SUB &&
instr.Operands[0] is x86ImmediateOperand &&
instr.Operands[1] is x86RegisterOperand)
{
/*
* sub imm, reg
* ==>
* neg reg
* add reg, imm
*/
x86Register reg = ((x86RegisterOperand)instr.Operands[1]).Register;
instrs.Add(x86Instruction.Create(x86OpCode.NEG, new x86RegisterOperand(reg)));
instr.OpCode = x86OpCode.ADD;
instr.Operands[1] = instr.Operands[0];
instr.Operands[0] = new x86RegisterOperand(reg);
instrs.Add(instr);
return(reg);
}
if (instr.Operands.Length == 2 &&
instr.Operands[0] is x86ImmediateOperand &&
instr.Operands[1] is x86RegisterOperand)
{
/*
* op imm, reg
* ==>
* op reg, imm
*/
x86Register reg = ((x86RegisterOperand)instr.Operands[1]).Register;
instr.Operands[1] = instr.Operands[0];
instr.Operands[0] = new x86RegisterOperand(reg);
instrs.Add(instr);
return(reg);
}
Debug.Assert(instr.Operands.Length > 0);
Debug.Assert(instr.Operands[0] is x86RegisterOperand);
if (instr.Operands.Length == 2 && instr.Operands[1] is x86RegisterOperand)
{
ReleaseRegister(((x86RegisterOperand)instr.Operands[1]).Register);
}
instrs.Add(instr);
return(((x86RegisterOperand)instr.Operands[0]).Register);
}
