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#include "instructions/arithmetic.h"
InstructionArithmetic::InstructionArithmetic(enum InstructionArithmeticT type, std::uint8_t rs, std::uint8_t rd, std::uint8_t rt)
: InstructionR(rs, rd, rt, 0) {
this->type = type;
}
void InstructionArithmetic::decode(Registers *regs) {
Instruction::decode(regs);
this->rs_d = regs->read_gp(this->rs);
this->rd_d = regs->read_gp(this->rd);
}
void InstructionArithmetic::execute() {
Instruction::execute();
switch (this->type) {
case IAT_ADD:
this->rt_d = (std::uint32_t)((std::int32_t)this->rs_d + (std::int32_t)this->rd_d);
break;
case IAT_ADDU:
this->rt_d = this->rs_d + this->rd_d;
break;
case IAT_SUB:
this->rt_d = (std::uint32_t)((std::int32_t)this->rs_d - (std::int32_t)this->rd_d);
break;
case IAT_SUBU:
this->rt_d = this->rs_d - this->rd_d;
break;
case IAT_AND:
this->rt_d = this->rs_d & this->rd_d;
break;
case IAT_OR:
this->rt_d = this->rs_d | this->rd_d;
break;
case IAT_XOR:
this->rt_d = this->rs_d ^ this->rd_d;
break;
case IAT_NOR:
// TODO
break;
case IAT_SLT:
// TODO
break;
case IAT_SLTU:
// TODO
break;
}
}
void InstructionArithmetic::memory(Memory *mem) {
Instruction::memory(mem);
// pass
}
void InstructionArithmetic::write_back(Registers *regs) {
Instruction::write_back(regs);
regs->write_gp(this->rt, this->rt_d);
}
QVector<QString> InstructionArithmetic::to_strs() {
QVector<QString> str = this->InstructionR::to_strs();
str.erase(str.begin() + 4); // Drop sa field
switch (this->type) {
case IAT_ADD:
str[0] = "add";
break;
case IAT_ADDU:
str[0] = "addu";
break;
case IAT_SUB:
str[0] = "sub";
break;
case IAT_SUBU:
str[0] = "subu";
break;
case IAT_AND:
str[0] = "and";
break;
case IAT_OR:
str[0] = "or";
break;
case IAT_XOR:
str[0] = "xor";
break;
case IAT_NOR:
str[0] = "nor";
break;
case IAT_SLT:
str[0] = "slt";
break;
case IAT_SLTU:
str[0] = "sltu";
break;
default:
// TODO different exception
throw std::exception();
}
return str;
}
InstructionArithmeticImmediate::InstructionArithmeticImmediate(enum InstructionArithmeticImmediateT type, std::uint8_t rs, std::uint8_t rt, std::uint16_t value)
: InstructionI(rs, rt, value) {
this->type = type;
}
void InstructionArithmeticImmediate::decode(Registers *regs) {
Instruction::decode(regs);
this->rs_d = regs->read_gp(this->rs);
}
void InstructionArithmeticImmediate::execute() {
Instruction::execute();
switch (this->type) {
case IAT_ADDI:
this->rt_d = (std::uint32_t)((std::int32_t)this->rs_d + (std::int32_t)this->immediate);
break;
case IAT_ADDIU:
this->rt_d = this->rs_d + this->immediate;
break;
case IAT_ANDI:
this->rt_d = (std::uint32_t)((std::int32_t)this->rs_d - (std::int32_t)this->immediate);
break;
case IAT_ORI:
this->rt_d = this->rs_d - this->immediate;
break;
case IAT_XORI:
this->rt_d = this->rs_d & this->immediate;
break;
}
}
void InstructionArithmeticImmediate::memory(Memory *mem) {
Instruction::memory(mem);
// pass
}
void InstructionArithmeticImmediate::write_back(Registers *regs) {
Instruction::write_back(regs);
regs->write_gp(this->rt, this->rt_d);
}
QVector<QString> InstructionArithmeticImmediate::to_strs() {
QVector<QString> str = this->InstructionI::to_strs();
switch (this->type) {
case IAT_ADDI:
str[0] = "addi";
break;
case IAT_ADDIU:
str[0] = "addiu";
break;
case IAT_ANDI:
str[0] = "andi";
break;
case IAT_ORI:
str[0] = "ori";
break;
case IAT_XORI:
str[0] = "xori";
break;
case IAT_SLTI:
str[0] = "slti";
break;
case IAT_SLTIU:
str[0] = "sltiu";
break;
case IAT_LUI:
str[0] = "lui";
break;
default:
// TODO different exception
throw std::exception();
}
return str;
}
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