This commit is contained in:
@@ -123,7 +123,7 @@ impl Instruction {
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let addr = Self::imm_word(cpu);
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let sp = cpu.register_pair(RegisterPair::SP);
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Self::write_word(&mut cpu.bus, addr, sp);
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(20)
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20
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}
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(LDTarget::Group1(pair), LDSource::ImmediateWord) => {
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// LD r16, u16 | Store u16 in 16-bit register
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@@ -133,7 +133,7 @@ impl Instruction {
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match pair {
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BC | DE | HL | SP => cpu.set_register_pair(pair.as_register_pair(), word),
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}
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(12)
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12
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}
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(LDTarget::IndirectGroup2(pair), LDSource::A) => {
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// LD (r16), A | Store accumulator in byte at 16-bit register
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@@ -155,7 +155,7 @@ impl Instruction {
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cpu.set_register_pair(RegisterPair::HL, addr - 1);
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}
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}
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(8)
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8
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}
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(LDTarget::A, LDSource::IndirectGroup2(pair)) => {
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// LD A, (r16) | Store byte at 16-bit register in accumulator
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@@ -178,7 +178,7 @@ impl Instruction {
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cpu.set_register_pair(RegisterPair::HL, addr - 1);
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}
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}
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(8)
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8
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}
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(LDTarget::Register(reg), LDSource::ImmediateByte) => {
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// LD r8, u8 | Store u8 in 8-bit register
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@@ -188,12 +188,12 @@ impl Instruction {
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match reg {
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A | B | C | D | E | H | L => {
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cpu.set_register(reg.cpu_register(), right);
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(8)
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8
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}
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IndirectHL => {
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let addr = cpu.register_pair(RegisterPair::HL);
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Self::write_byte(&mut cpu.bus, addr, right);
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(12)
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12
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}
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}
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}
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@@ -202,14 +202,14 @@ impl Instruction {
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let addr = 0xFF00 + cpu.register(CpuRegister::C) as u16;
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let acc = cpu.register(CpuRegister::A);
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Self::write_byte(&mut cpu.bus, addr, acc);
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(8)
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8
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}
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(LDTarget::A, LDSource::IoWithC) => {
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// LD A, (0xFF00 + C) | Store byte at 0xFF00 + C in register A
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let addr = 0xFF00 + cpu.register(CpuRegister::C) as u16;
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let byte = Self::read_byte(&mut cpu.bus, addr);
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cpu.set_register(CpuRegister::A, byte);
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(8)
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8
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}
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(LDTarget::Register(target), LDSource::Register(source)) => {
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// LD r8, r8 | Store 8-bit register in 8-bit register
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@@ -222,12 +222,12 @@ impl Instruction {
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match target {
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B | C | D | E | H | L | A => {
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cpu.set_register(target.cpu_register(), right);
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(4)
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4
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}
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IndirectHL => {
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let addr = cpu.register_pair(RegisterPair::HL);
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Self::write_byte(&mut cpu.bus, addr, right);
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(8)
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8
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}
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}
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}
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@@ -238,7 +238,7 @@ impl Instruction {
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match target {
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B | C | D | E | H | L | A => {
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cpu.set_register(target.cpu_register(), right);
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(8)
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8
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}
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IndirectHL => {
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unreachable!("LD (HL), (HL) is an illegal instruction")
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@@ -252,33 +252,33 @@ impl Instruction {
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let addr = 0xFF00 + Self::imm_byte(cpu) as u16;
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let acc = cpu.register(CpuRegister::A);
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Self::write_byte(&mut cpu.bus, addr, acc);
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(12)
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12
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}
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(LDTarget::A, LDSource::IoWithImmediateOffset) => {
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// LD A, (0xFF00 + u8) | Store byte at address 0xFF00 + u8 in accumulator
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let addr = 0xFF00 + Self::imm_byte(cpu) as u16;
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let byte = Self::read_byte(&mut cpu.bus, addr);
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cpu.set_register(CpuRegister::A, byte);
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(12)
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12
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}
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(LDTarget::SP, LDSource::HL) => {
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// LD SP, HL | Store HL in stack pointer
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cpu.set_register_pair(RegisterPair::SP, cpu.register_pair(RegisterPair::HL));
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(8) // performs an internal operation that takes 4 cycles
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8 // performs an internal operation that takes 4 cycles
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}
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(LDTarget::IndirectImmediateWord, LDSource::A) => {
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// LD (u16), A | Store accumulator in byte at 16-bit register
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let addr = Self::imm_word(cpu);
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let acc = cpu.register(CpuRegister::A);
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Self::write_byte(&mut cpu.bus, addr, acc);
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(16)
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16
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}
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(LDTarget::A, LDSource::IndirectImmediateWord) => {
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// LD A, (u16) | Store byte at 16-bit register in accumulator
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let addr = Self::imm_word(cpu);
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let byte = Self::read_byte(&mut cpu.bus, addr);
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cpu.set_register(CpuRegister::A, byte);
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(16)
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16
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}
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_ => unreachable!("LD {:?}, {:?} is an illegal instruction", target, src),
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},
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@@ -296,38 +296,38 @@ impl Instruction {
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JumpCondition::NotZero => {
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if !flags.z() {
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Self::jump(cpu, addr);
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(12)
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12
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} else {
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(8)
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8
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}
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}
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JumpCondition::Zero => {
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if flags.z() {
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Self::jump(cpu, addr);
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(12)
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12
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} else {
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(8)
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8
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}
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}
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JumpCondition::NotCarry => {
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if !flags.c() {
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Self::jump(cpu, addr);
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(12)
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12
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} else {
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(8)
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8
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}
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}
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JumpCondition::Carry => {
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if flags.c() {
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Self::jump(cpu, addr);
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(12)
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12
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} else {
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(8)
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8
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}
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}
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JumpCondition::Always => {
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Self::jump(cpu, addr);
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(12)
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12
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}
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}
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}
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@@ -349,7 +349,7 @@ impl Instruction {
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}
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}
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cpu.set_flags(flags);
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(8)
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8
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}
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(AddTarget::A, AddSource::Register(reg)) => {
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// ADD A, r8 | Add 8-bit register to accumulator
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@@ -383,7 +383,7 @@ impl Instruction {
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let sum = Self::add_u16_i8(left, Self::imm_byte(cpu) as i8, &mut flags);
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cpu.set_register_pair(RegisterPair::SP, sum);
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cpu.set_flags(flags);
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(16)
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16
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}
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(AddTarget::A, AddSource::ImmediateByte) => {
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// ADD A, u8 | Add u8 to accumulator
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@@ -393,7 +393,7 @@ impl Instruction {
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let sum = Self::add(left, Self::imm_byte(cpu), &mut flags);
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cpu.set_register(CpuRegister::A, sum);
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cpu.set_flags(flags);
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(8)
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8
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}
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_ => unreachable!("ADD {:?}, {:?} is an illegal instruction", target, src),
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},
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@@ -408,13 +408,13 @@ impl Instruction {
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B | C | D | E | H | L | A => {
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let reg = reg.cpu_register();
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cpu.set_register(reg, Self::inc(cpu.register(reg), &mut flags));
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(4)
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4
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}
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IndirectHL => {
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let addr = cpu.register_pair(RegisterPair::HL);
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let left = Self::read_byte(&mut cpu.bus, addr);
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Self::write_byte(&mut cpu.bus, addr, Self::inc(left, &mut flags));
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(12)
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12
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}
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};
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cpu.set_flags(flags);
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@@ -433,7 +433,7 @@ impl Instruction {
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cpu.set_register_pair(pair, left.wrapping_add(1));
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}
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}
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(8)
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8
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}
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}
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}
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@@ -448,13 +448,13 @@ impl Instruction {
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B | C | D | E | H | L | A => {
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let reg = reg.cpu_register();
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cpu.set_register(reg, Self::dec(cpu.register(reg), &mut flags));
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(4)
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4
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}
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IndirectHL => {
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let addr = cpu.register_pair(RegisterPair::HL);
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let left = Self::read_byte(&mut cpu.bus, addr);
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Self::write_byte(&mut cpu.bus, addr, Self::dec(left, &mut flags));
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(12)
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12
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}
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};
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cpu.set_flags(flags);
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@@ -472,7 +472,7 @@ impl Instruction {
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cpu.set_register_pair(pair, left.wrapping_sub(1));
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}
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};
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(8)
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8
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}
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}
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}
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@@ -483,7 +483,7 @@ impl Instruction {
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let acc_rotated = acc.rotate_left(1);
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cpu.set_register(CpuRegister::A, acc_rotated);
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cpu.update_flags(false, false, false, most_sgfnt == 0x01);
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(4)
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4
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}
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Instruction::RRCA => {
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// RRCA | Rotate accumulator right
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@@ -492,7 +492,7 @@ impl Instruction {
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let acc_rotated = acc.rotate_right(1);
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cpu.set_register(CpuRegister::A, acc_rotated);
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cpu.update_flags(false, false, false, least_sgfnt == 0x01);
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(4)
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4
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}
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Instruction::RLA => {
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// RLA | Rotate accumulator left through carry
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@@ -502,7 +502,7 @@ impl Instruction {
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let (acc_rotated, carry) = Self::rl_thru_carry(acc, flags.c());
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cpu.set_register(CpuRegister::A, acc_rotated);
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cpu.update_flags(false, false, false, carry);
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(4)
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4
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}
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Instruction::RRA => {
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// RRA | Rotate accumulator right through carry
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@@ -512,7 +512,7 @@ impl Instruction {
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let (acc_rotated, carry) = Self::rr_thru_carry(acc, flags.c());
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cpu.set_register(CpuRegister::A, acc_rotated);
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cpu.update_flags(false, false, false, carry);
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(4)
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4
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}
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Instruction::DAA => {
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// DAA | Change accumulator into its BCD representation
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@@ -553,7 +553,7 @@ impl Instruction {
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flags.set_z(tmp as u8 == 0);
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flags.set_h(false);
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cpu.set_flags(flags);
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(4)
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4
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}
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Instruction::CPL => {
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// CPL | Compliment accumulator
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@@ -564,7 +564,7 @@ impl Instruction {
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flags.set_n(true);
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flags.set_h(true);
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cpu.set_flags(flags);
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(4)
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4
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}
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Instruction::SCF => {
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// SCF | Set Carry Flag
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@@ -574,7 +574,7 @@ impl Instruction {
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flags.set_h(false);
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flags.set_c(true);
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cpu.set_flags(flags);
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(4)
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4
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}
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Instruction::CCF => {
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// CCF | Compliment Carry Flag
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@@ -584,7 +584,7 @@ impl Instruction {
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flags.set_h(false);
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flags.set_c(!flags.c());
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cpu.set_flags(flags);
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(4)
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4
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}
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Instruction::HALT => {
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// HALT | Enter CPU low power consumption mode until interrupt occurs
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@@ -596,7 +596,7 @@ impl Instruction {
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_ => NonePending,
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};
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cpu.halt_cpu(kind);
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(4)
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4
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}
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Instruction::ADC(source) => match source {
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AluSource::Register(reg) => {
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@@ -632,7 +632,7 @@ impl Instruction {
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let sum = Self::add_with_carry_bit(left, right, flags.c(), &mut flags);
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cpu.set_register(CpuRegister::A, sum);
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cpu.set_flags(flags);
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(8)
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8
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}
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},
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Instruction::SUB(source) => match source {
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@@ -666,7 +666,7 @@ impl Instruction {
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let right = Self::imm_byte(cpu);
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cpu.set_register(CpuRegister::A, Self::sub(left, right, &mut flags));
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cpu.set_flags(flags);
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(8)
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8
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}
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},
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Instruction::SBC(target) => match target {
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@@ -703,7 +703,7 @@ impl Instruction {
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let diff = Self::sub_with_carry(left, right, flags.c(), &mut flags);
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cpu.set_register(CpuRegister::A, diff);
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cpu.set_flags(flags);
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(8)
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8
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}
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},
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Instruction::AND(target) => match target {
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@@ -729,7 +729,7 @@ impl Instruction {
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let acc = cpu.register(CpuRegister::A) & Self::imm_byte(cpu);
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cpu.set_register(CpuRegister::A, acc);
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cpu.update_flags(acc == 0, false, true, false);
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(8)
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8
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}
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},
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Instruction::XOR(source) => match source {
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@@ -755,7 +755,7 @@ impl Instruction {
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let acc = cpu.register(CpuRegister::A) ^ Self::imm_byte(cpu);
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cpu.set_register(CpuRegister::A, acc);
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cpu.update_flags(acc == 0, false, false, false);
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(8)
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8
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}
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},
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Instruction::OR(target) => match target {
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@@ -781,7 +781,7 @@ impl Instruction {
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let acc = cpu.register(CpuRegister::A) | Self::imm_byte(cpu);
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cpu.set_register(CpuRegister::A, acc);
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cpu.update_flags(acc == 0, false, false, false);
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(8)
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8
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}
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},
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Instruction::CP(target) => match target {
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@@ -795,13 +795,13 @@ impl Instruction {
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let cycles = match reg {
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B | C | D | E | H | L | A => {
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let _ = Self::sub(left, cpu.register(reg.cpu_register()), &mut flags);
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(4)
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4
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}
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IndirectHL => {
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let addr = cpu.register_pair(RegisterPair::HL);
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let right = Self::read_byte(&mut cpu.bus, addr);
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let _ = Self::sub(left, right, &mut flags);
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(8)
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8
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}
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};
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cpu.set_flags(flags);
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@@ -814,7 +814,7 @@ impl Instruction {
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let left = cpu.register(CpuRegister::A);
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let _ = Self::sub(left, Self::imm_byte(cpu), &mut flags);
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cpu.set_flags(flags);
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(8)
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8
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}
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},
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Instruction::LDHL => {
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@@ -826,7 +826,7 @@ impl Instruction {
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cpu.set_register_pair(RegisterPair::HL, sum);
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cpu.set_flags(flags);
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cpu.bus.clock(); // FIXME: Is this in the right place?
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(12)
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12
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}
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Instruction::RET(cond) => {
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// RET cond | Return from subroutine if condition is true
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@@ -840,9 +840,9 @@ impl Instruction {
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if !flags.z() {
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let addr = Self::pop(cpu);
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Self::jump(cpu, addr);
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(20)
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20
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} else {
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(8)
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8
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}
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}
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JumpCondition::Zero => {
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@@ -851,9 +851,9 @@ impl Instruction {
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if flags.z() {
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let addr = Self::pop(cpu);
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Self::jump(cpu, addr);
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(20)
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20
|
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} else {
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(8)
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8
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}
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}
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JumpCondition::NotCarry => {
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@@ -862,9 +862,9 @@ impl Instruction {
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if !flags.c() {
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let addr = Self::pop(cpu);
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Self::jump(cpu, addr);
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(20)
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20
|
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} else {
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(8)
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8
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}
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}
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JumpCondition::Carry => {
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@@ -873,15 +873,15 @@ impl Instruction {
|
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if flags.c() {
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let addr = Self::pop(cpu);
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Self::jump(cpu, addr);
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(20)
|
||||
20
|
||||
} else {
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(8)
|
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8
|
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}
|
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}
|
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JumpCondition::Always => {
|
||||
let addr = Self::pop(cpu);
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Self::jump(cpu, addr);
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||||
(16)
|
||||
16
|
||||
}
|
||||
}
|
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}
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@@ -895,21 +895,21 @@ impl Instruction {
|
||||
cpu.set_register_pair(pair.as_register_pair(), right);
|
||||
}
|
||||
}
|
||||
(12)
|
||||
12
|
||||
}
|
||||
Instruction::RETI => {
|
||||
// RETI | Return from subroutine, then enable interrupts
|
||||
let addr = Self::pop(cpu);
|
||||
Self::jump(cpu, addr);
|
||||
cpu.set_ime(ImeState::Enabled);
|
||||
(16)
|
||||
16
|
||||
}
|
||||
Instruction::JP(cond, location) => match location {
|
||||
JumpLocation::HL => {
|
||||
// JP HL | Store HL in program counter
|
||||
let right = cpu.register_pair(RegisterPair::HL);
|
||||
cpu.set_register_pair(RegisterPair::PC, right);
|
||||
(4)
|
||||
4
|
||||
}
|
||||
JumpLocation::ImmediateWord => {
|
||||
// JP cond u16 | Store u16 in program counter if condition is true
|
||||
@@ -922,38 +922,38 @@ impl Instruction {
|
||||
JumpCondition::NotZero => {
|
||||
if !flags.z() {
|
||||
Self::jump(cpu, addr);
|
||||
(16)
|
||||
16
|
||||
} else {
|
||||
(12)
|
||||
12
|
||||
}
|
||||
}
|
||||
JumpCondition::Zero => {
|
||||
if flags.z() {
|
||||
Self::jump(cpu, addr);
|
||||
(16)
|
||||
16
|
||||
} else {
|
||||
(12)
|
||||
12
|
||||
}
|
||||
}
|
||||
JumpCondition::NotCarry => {
|
||||
if !flags.c() {
|
||||
Self::jump(cpu, addr);
|
||||
(16)
|
||||
16
|
||||
} else {
|
||||
(12)
|
||||
12
|
||||
}
|
||||
}
|
||||
JumpCondition::Carry => {
|
||||
if flags.c() {
|
||||
Self::jump(cpu, addr);
|
||||
(16)
|
||||
16
|
||||
} else {
|
||||
(12)
|
||||
12
|
||||
}
|
||||
}
|
||||
JumpCondition::Always => {
|
||||
Self::jump(cpu, addr);
|
||||
(16)
|
||||
16
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -961,12 +961,12 @@ impl Instruction {
|
||||
Instruction::DI => {
|
||||
// DI | Disable IME
|
||||
cpu.set_ime(ImeState::Disabled);
|
||||
(4)
|
||||
4
|
||||
}
|
||||
Instruction::EI => {
|
||||
// EI | Enable IME after the next instruction
|
||||
cpu.set_ime(ImeState::EiExecuted);
|
||||
(4)
|
||||
4
|
||||
}
|
||||
Instruction::CALL(cond) => {
|
||||
// CALL cond u16 | Push PC on the stack and store u16 in program counter if condition is true
|
||||
@@ -982,9 +982,9 @@ impl Instruction {
|
||||
cpu.bus.clock(); // internal branch decision
|
||||
Self::push(cpu, return_addr);
|
||||
cpu.set_register_pair(RegisterPair::PC, addr);
|
||||
(24)
|
||||
24
|
||||
} else {
|
||||
(12)
|
||||
12
|
||||
}
|
||||
}
|
||||
JumpCondition::Zero => {
|
||||
@@ -992,9 +992,9 @@ impl Instruction {
|
||||
cpu.bus.clock(); // internal branch decision
|
||||
Self::push(cpu, return_addr);
|
||||
cpu.set_register_pair(RegisterPair::PC, addr);
|
||||
(24)
|
||||
24
|
||||
} else {
|
||||
(12)
|
||||
12
|
||||
}
|
||||
}
|
||||
JumpCondition::NotCarry => {
|
||||
@@ -1002,9 +1002,9 @@ impl Instruction {
|
||||
cpu.bus.clock(); // internal branch decision
|
||||
Self::push(cpu, return_addr);
|
||||
cpu.set_register_pair(RegisterPair::PC, addr);
|
||||
(24)
|
||||
24
|
||||
} else {
|
||||
(12)
|
||||
12
|
||||
}
|
||||
}
|
||||
JumpCondition::Carry => {
|
||||
@@ -1012,16 +1012,16 @@ impl Instruction {
|
||||
cpu.bus.clock(); // internal branch decision
|
||||
Self::push(cpu, return_addr);
|
||||
cpu.set_register_pair(RegisterPair::PC, addr);
|
||||
(24)
|
||||
24
|
||||
} else {
|
||||
(12)
|
||||
12
|
||||
}
|
||||
}
|
||||
JumpCondition::Always => {
|
||||
cpu.bus.clock(); // internal branch decision
|
||||
Self::push(cpu, return_addr);
|
||||
cpu.set_register_pair(RegisterPair::PC, addr);
|
||||
(24)
|
||||
24
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -1037,7 +1037,7 @@ impl Instruction {
|
||||
Self::push(cpu, word);
|
||||
}
|
||||
}
|
||||
(16)
|
||||
16
|
||||
}
|
||||
Instruction::RST(vector) => {
|
||||
// RST vector | Push current address onto the stack, jump to 0x0000 + n
|
||||
@@ -1262,13 +1262,13 @@ impl Instruction {
|
||||
let register = reg.cpu_register();
|
||||
let byte = cpu.register(register);
|
||||
cpu.set_register(register, byte & !(1 << bit));
|
||||
(8)
|
||||
8
|
||||
}
|
||||
IndirectHL => {
|
||||
let addr = cpu.register_pair(RegisterPair::HL);
|
||||
let byte = Self::read_byte(&mut cpu.bus, addr);
|
||||
Self::write_byte(&mut cpu.bus, addr, byte & !(1 << bit));
|
||||
(16)
|
||||
16
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -1281,13 +1281,13 @@ impl Instruction {
|
||||
let reg = reg.cpu_register();
|
||||
let byte = cpu.register(reg);
|
||||
cpu.set_register(reg, byte | (1u8 << bit));
|
||||
(8)
|
||||
8
|
||||
}
|
||||
IndirectHL => {
|
||||
let addr = cpu.register_pair(RegisterPair::HL);
|
||||
let byte = Self::read_byte(&mut cpu.bus, addr);
|
||||
Self::write_byte(&mut cpu.bus, addr, byte | (1u8 << bit));
|
||||
(16)
|
||||
16
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -1473,7 +1473,7 @@ impl Instruction {
|
||||
let addr = cpu.register_pair(RegisterPair::PC);
|
||||
Self::push(cpu, addr);
|
||||
cpu.set_register_pair(RegisterPair::PC, vector as u16);
|
||||
(16)
|
||||
16
|
||||
}
|
||||
|
||||
/// Read u8 from memory (4 cycles)
|
||||
|
||||
Reference in New Issue
Block a user