inst.rs

fn ld_a_mhld(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.a = byte;
    cpu.set_hl(cpu.hl().wrapping_sub(1));
}

fn dec_sp(cpu: &mut Cpu) {
    cpu.sp = cpu.sp.wrapping_sub(1);
}

fn inc_a(cpu: &mut Cpu) {
    let a = cpu.a;
    let value = a.wrapping_add(1);

    cpu.set_sub(false);
    cpu.set_zero(value == 0);
    cpu.set_half_carry((a & 0xf) == 0xf);

    cpu.a = value;
}

fn dec_a(cpu: &mut Cpu) {
    let a = cpu.a;
    let value = a.wrapping_sub(1);

    cpu.set_sub(true);
    cpu.set_zero(value == 0);
    cpu.set_half_carry((a & 0xf) == 0x0);

    cpu.a = value;
}

fn ld_a_u8(cpu: &mut Cpu) {
    let byte = cpu.read_u8();
    cpu.a = byte;
}

fn ccf(cpu: &mut Cpu) {
    cpu.set_sub(false);
    cpu.set_half_carry(false);
    cpu.set_carry(!cpu.carry());
}

fn ld_b_b(_cpu: &mut Cpu) {}

fn ld_b_c(cpu: &mut Cpu) {
    cpu.b = cpu.c;
}

fn ld_b_d(cpu: &mut Cpu) {
    cpu.b = cpu.d;
}

fn ld_b_e(cpu: &mut Cpu) {
    cpu.b = cpu.e;
}

fn ld_b_h(cpu: &mut Cpu) {
    cpu.b = cpu.h;
}

fn ld_b_l(cpu: &mut Cpu) {
    cpu.b = cpu.l;
}

fn ld_b_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.b = byte;
}

fn ld_b_a(cpu: &mut Cpu) {
    cpu.b = cpu.a;
}

fn ld_c_b(cpu: &mut Cpu) {
    cpu.c = cpu.b;
}

fn ld_c_c(_cpu: &mut Cpu) {}

fn ld_c_d(cpu: &mut Cpu) {
    cpu.c = cpu.d;
}

fn ld_c_e(cpu: &mut Cpu) {
    cpu.c = cpu.e;
}

fn ld_c_h(cpu: &mut Cpu) {
    cpu.c = cpu.h;
}

fn ld_c_l(cpu: &mut Cpu) {
    cpu.c = cpu.l;
}

fn ld_c_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.c = byte;
}

fn ld_c_a(cpu: &mut Cpu) {
    cpu.c = cpu.a;
}

fn ld_d_b(cpu: &mut Cpu) {
    cpu.d = cpu.b;
}

fn ld_d_c(cpu: &mut Cpu) {
    cpu.d = cpu.c;
}

fn ld_d_d(_cpu: &mut Cpu) {}

fn ld_d_e(cpu: &mut Cpu) {
    cpu.d = cpu.e;
}

fn ld_d_h(cpu: &mut Cpu) {
    cpu.d = cpu.h;
}

fn ld_d_l(cpu: &mut Cpu) {
    cpu.d = cpu.l;
}

fn ld_d_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.d = byte;
}

fn ld_d_a(cpu: &mut Cpu) {
    cpu.d = cpu.a;
}

fn ld_e_b(cpu: &mut Cpu) {
    cpu.e = cpu.b;
}

fn ld_e_c(cpu: &mut Cpu) {
    cpu.e = cpu.c;
}

fn ld_e_d(cpu: &mut Cpu) {
    cpu.e = cpu.d;
}

fn ld_e_e(_cpu: &mut Cpu) {}

fn ld_e_h(cpu: &mut Cpu) {
    cpu.e = cpu.h;
}

fn ld_e_l(cpu: &mut Cpu) {
    cpu.e = cpu.l;
}

fn ld_e_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.e = byte;
}

fn ld_e_a(cpu: &mut Cpu) {
    cpu.e = cpu.a;
}

fn ld_h_b(cpu: &mut Cpu) {
    cpu.h = cpu.b;
}

fn ld_h_c(cpu: &mut Cpu) {
    cpu.h = cpu.c;
}

fn ld_h_d(cpu: &mut Cpu) {
    cpu.h = cpu.d;
}

fn ld_h_e(cpu: &mut Cpu) {
    cpu.h = cpu.e;
}

fn ld_h_h(_cpu: &mut Cpu) {}

fn ld_h_l(cpu: &mut Cpu) {
    cpu.h = cpu.l;
}

fn ld_h_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.h = byte;
}

fn ld_h_a(cpu: &mut Cpu) {
    cpu.h = cpu.a;
}

fn ld_l_b(cpu: &mut Cpu) {
    cpu.l = cpu.b;
}

fn ld_l_c(cpu: &mut Cpu) {
    cpu.l = cpu.c;
}

fn ld_l_d(cpu: &mut Cpu) {
    cpu.l = cpu.d;
}

fn ld_l_e(cpu: &mut Cpu) {
    cpu.l = cpu.e;
}

fn ld_l_h(cpu: &mut Cpu) {
    cpu.l = cpu.h;
}

fn ld_l_l(_cpu: &mut Cpu) {}

fn ld_l_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.l = byte;
}

fn ld_l_a(cpu: &mut Cpu) {
    cpu.l = cpu.a;
}

fn ld_mhl_b(cpu: &mut Cpu) {
    cpu.mmu.write(cpu.hl(), cpu.b);
}

fn ld_mhl_c(cpu: &mut Cpu) {
    cpu.mmu.write(cpu.hl(), cpu.c);
}

fn ld_mhl_d(cpu: &mut Cpu) {
    cpu.mmu.write(cpu.hl(), cpu.d);
}

fn ld_mhl_e(cpu: &mut Cpu) {
    cpu.mmu.write(cpu.hl(), cpu.e);
}

fn ld_mhl_h(cpu: &mut Cpu) {
    cpu.mmu.write(cpu.hl(), cpu.h);
}

fn ld_mhl_l(cpu: &mut Cpu) {
    cpu.mmu.write(cpu.hl(), cpu.l);
}

fn halt(cpu: &mut Cpu) {
    cpu.halt();
}

fn ld_mhl_a(cpu: &mut Cpu) {
    cpu.mmu.write(cpu.hl(), cpu.a);
}

fn ld_a_b(cpu: &mut Cpu) {
    cpu.a = cpu.b;
}

fn ld_a_c(cpu: &mut Cpu) {
    cpu.a = cpu.c;
}

fn ld_a_d(cpu: &mut Cpu) {
    cpu.a = cpu.d;
}

fn ld_a_e(cpu: &mut Cpu) {
    cpu.a = cpu.e;
}

fn ld_a_h(cpu: &mut Cpu) {
    cpu.a = cpu.h;
}

fn ld_a_l(cpu: &mut Cpu) {
    cpu.a = cpu.l;
}

fn ld_a_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.a = byte;
}

fn ld_a_a(_cpu: &mut Cpu) {}

fn add_a_b(cpu: &mut Cpu) {
    cpu.a = add_set_flags(cpu, cpu.a, cpu.b);
}

fn add_a_c(cpu: &mut Cpu) {
    cpu.a = add_set_flags(cpu, cpu.a, cpu.c);
}

fn add_a_d(cpu: &mut Cpu) {
    cpu.a = add_set_flags(cpu, cpu.a, cpu.d);
}

fn add_a_e(cpu: &mut Cpu) {
    cpu.a = add_set_flags(cpu, cpu.a, cpu.e);
}

fn add_a_h(cpu: &mut Cpu) {
    cpu.a = add_set_flags(cpu, cpu.a, cpu.h);
}

fn add_a_l(cpu: &mut Cpu) {
    cpu.a = add_set_flags(cpu, cpu.a, cpu.l);
}

fn add_a_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.a = add_set_flags(cpu, cpu.a, byte);
}

fn add_a_a(cpu: &mut Cpu) {
    cpu.a = add_set_flags(cpu, cpu.a, cpu.a);
}

fn adc_a_b(cpu: &mut Cpu) {
    cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.b);
}

fn adc_a_c(cpu: &mut Cpu) {
    cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.c);
}

fn adc_a_d(cpu: &mut Cpu) {
    cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.d);
}

fn adc_a_e(cpu: &mut Cpu) {
    cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.e);
}

fn adc_a_h(cpu: &mut Cpu) {
    cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.h);
}

fn adc_a_l(cpu: &mut Cpu) {
    cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.l);
}

fn adc_a_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.a = add_carry_set_flags(cpu, cpu.a, byte);
}

fn adc_a_a(cpu: &mut Cpu) {
    cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.a);
}

fn sub_a_b(cpu: &mut Cpu) {
    cpu.a = sub_set_flags(cpu, cpu.a, cpu.b);
}

fn sub_a_c(cpu: &mut Cpu) {
    cpu.a = sub_set_flags(cpu, cpu.a, cpu.c);
}

fn sub_a_d(cpu: &mut Cpu) {
    cpu.a = sub_set_flags(cpu, cpu.a, cpu.d);
}

fn sub_a_e(cpu: &mut Cpu) {
    cpu.a = sub_set_flags(cpu, cpu.a, cpu.e);
}

fn sub_a_h(cpu: &mut Cpu) {
    cpu.a = sub_set_flags(cpu, cpu.a, cpu.h);
}

fn sub_a_l(cpu: &mut Cpu) {
    cpu.a = sub_set_flags(cpu, cpu.a, cpu.l);
}

fn sub_a_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.a = sub_set_flags(cpu, cpu.a, byte);
}

fn sub_a_a(cpu: &mut Cpu) {
    cpu.a = sub_set_flags(cpu, cpu.a, cpu.a);
}

fn sbc_a_b(cpu: &mut Cpu) {
    cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.b);
}

fn sbc_a_c(cpu: &mut Cpu) {
    cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.c);
}

fn sbc_a_d(cpu: &mut Cpu) {
    cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.d);
}

fn sbc_a_e(cpu: &mut Cpu) {
    cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.e);
}

fn sbc_a_h(cpu: &mut Cpu) {
    cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.h);
}

fn sbc_a_l(cpu: &mut Cpu) {
    cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.l);
}

fn sbc_a_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.a = sub_carry_set_flags(cpu, cpu.a, byte);
}

fn sbc_a_a(cpu: &mut Cpu) {
    cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.a);
}

fn and_a_b(cpu: &mut Cpu) {
    cpu.a &= cpu.b;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(true);
    cpu.set_carry(false);
}

fn and_a_c(cpu: &mut Cpu) {
    cpu.a &= cpu.c;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(true);
    cpu.set_carry(false);
}

fn and_a_d(cpu: &mut Cpu) {
    cpu.a &= cpu.d;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(true);
    cpu.set_carry(false);
}

fn and_a_e(cpu: &mut Cpu) {
    cpu.a &= cpu.e;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(true);
    cpu.set_carry(false);
}

fn and_a_h(cpu: &mut Cpu) {
    cpu.a &= cpu.h;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(true);
    cpu.set_carry(false);
}

fn and_a_l(cpu: &mut Cpu) {
    cpu.a &= cpu.l;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(true);
    cpu.set_carry(false);
}

fn and_a_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.a &= byte;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(true);
    cpu.set_carry(false);
}

fn and_a_a(cpu: &mut Cpu) {
    cpu.a &= cpu.a;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(true);
    cpu.set_carry(false);
}

fn xor_a_b(cpu: &mut Cpu) {
    cpu.a ^= cpu.b;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn xor_a_c(cpu: &mut Cpu) {
    cpu.a ^= cpu.c;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn xor_a_d(cpu: &mut Cpu) {
    cpu.a ^= cpu.d;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn xor_a_e(cpu: &mut Cpu) {
    cpu.a ^= cpu.e;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn xor_a_h(cpu: &mut Cpu) {
    cpu.a ^= cpu.h;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn xor_a_l(cpu: &mut Cpu) {
    cpu.a ^= cpu.l;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn xor_a_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.a ^= byte;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn xor_a_a(cpu: &mut Cpu) {
    cpu.a ^= cpu.a;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn or_a_b(cpu: &mut Cpu) {
    cpu.a |= cpu.b;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn or_a_c(cpu: &mut Cpu) {
    cpu.a |= cpu.c;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn or_a_d(cpu: &mut Cpu) {
    cpu.a |= cpu.d;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn or_a_e(cpu: &mut Cpu) {
    cpu.a |= cpu.e;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn or_a_h(cpu: &mut Cpu) {
    cpu.a |= cpu.h;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn or_a_l(cpu: &mut Cpu) {
    cpu.a |= cpu.l;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn or_a_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    cpu.a |= byte;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn or_a_a(cpu: &mut Cpu) {
    cpu.a |= cpu.a;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn cp_a_b(cpu: &mut Cpu) {
    sub_set_flags(cpu, cpu.a, cpu.b);
}

fn cp_a_c(cpu: &mut Cpu) {
    sub_set_flags(cpu, cpu.a, cpu.c);
}

fn cp_a_d(cpu: &mut Cpu) {
    sub_set_flags(cpu, cpu.a, cpu.d);
}

fn cp_a_e(cpu: &mut Cpu) {
    sub_set_flags(cpu, cpu.a, cpu.e);
}

fn cp_a_h(cpu: &mut Cpu) {
    sub_set_flags(cpu, cpu.a, cpu.h);
}

fn cp_a_l(cpu: &mut Cpu) {
    sub_set_flags(cpu, cpu.a, cpu.l);
}

fn cp_a_mhl(cpu: &mut Cpu) {
    let byte = cpu.mmu.read(cpu.hl());
    sub_set_flags(cpu, cpu.a, byte);
}

fn cp_a_a(cpu: &mut Cpu) {
    sub_set_flags(cpu, cpu.a, cpu.a);
}

fn ret_nz(cpu: &mut Cpu) {
    if cpu.zero() {
        return;
    }

    cpu.pc = cpu.pop_word();
    cpu.cycles = cpu.cycles.wrapping_add(12);
}

fn pop_bc(cpu: &mut Cpu) {
    let word = cpu.pop_word();
    cpu.set_bc(word);
}

fn jp_nz_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();

    if cpu.zero() {
        return;
    }

    cpu.pc = word;
    cpu.cycles = cpu.cycles.wrapping_add(4);
}

fn jp_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();
    cpu.pc = word;
}

fn call_nz_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();

    if cpu.zero() {
        return;
    }

    cpu.push_word(cpu.pc);
    cpu.pc = word;
    cpu.cycles = cpu.cycles.wrapping_add(12);
}

fn push_bc(cpu: &mut Cpu) {
    cpu.push_word(cpu.bc());
}

fn add_a_u8(cpu: &mut Cpu) {
    let byte = cpu.read_u8();
    cpu.a = add_set_flags(cpu, cpu.a, byte);
}

fn rst_00h(cpu: &mut Cpu) {
    rst(cpu, 0x0000);
}

fn ret_z(cpu: &mut Cpu) {
    if !cpu.zero() {
        return;
    }

    cpu.pc = cpu.pop_word();
    cpu.cycles = cpu.cycles.wrapping_add(12);
}

fn ret(cpu: &mut Cpu) {
    cpu.pc = cpu.pop_word();
}

fn jp_z_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();

    if !cpu.zero() {
        return;
    }

    cpu.pc = word;
    cpu.cycles = cpu.cycles.wrapping_add(4);
}

fn call_z_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();

    if !cpu.zero() {
        return;
    }

    cpu.push_word(cpu.pc);
    cpu.pc = word;
    cpu.cycles = cpu.cycles.wrapping_add(12);
}

fn call_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();
    cpu.push_word(cpu.pc);
    cpu.pc = word;
}

fn adc_a_u8(cpu: &mut Cpu) {
    let byte = cpu.read_u8();
    cpu.a = add_carry_set_flags(cpu, cpu.a, byte);
}

fn rst_08h(cpu: &mut Cpu) {
    rst(cpu, 0x0008);
}

fn ret_nc(cpu: &mut Cpu) {
    if cpu.carry() {
        return;
    }

    cpu.pc = cpu.pop_word();
    cpu.cycles = cpu.cycles.wrapping_add(12);
}

fn pop_de(cpu: &mut Cpu) {
    let word = cpu.pop_word();
    cpu.set_de(word);
}

fn jp_nc_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();

    if cpu.carry() {
        return;
    }

    cpu.pc = word;
    cpu.cycles = cpu.cycles.wrapping_add(4);
}

fn call_nc_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();

    if cpu.carry() {
        return;
    }

    cpu.push_word(cpu.pc);
    cpu.pc = word;
    cpu.cycles = cpu.cycles.wrapping_add(12);
}

fn push_de(cpu: &mut Cpu) {
    cpu.push_word(cpu.de());
}

fn sub_a_u8(cpu: &mut Cpu) {
    let byte = cpu.read_u8();
    cpu.a = sub_set_flags(cpu, cpu.a, byte);
}

fn rst_10h(cpu: &mut Cpu) {
    rst(cpu, 0x0010);
}

fn ret_c(cpu: &mut Cpu) {
    if !cpu.carry() {
        return;
    }

    cpu.pc = cpu.pop_word();
    cpu.cycles = cpu.cycles.wrapping_add(12);
}

fn reti(cpu: &mut Cpu) {
    cpu.pc = cpu.pop_word();
    cpu.enable_int();
}

fn jp_c_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();

    if !cpu.carry() {
        return;
    }

    cpu.pc = word;
    cpu.cycles = cpu.cycles.wrapping_add(4);
}

fn call_c_u16(cpu: &mut Cpu) {
    let word = cpu.read_u16();

    if !cpu.carry() {
        return;
    }

    cpu.push_word(cpu.pc);
    cpu.pc = word;
    cpu.cycles = cpu.cycles.wrapping_add(12);
}

fn sbc_a_u8(cpu: &mut Cpu) {
    let byte = cpu.read_u8();
    cpu.a = sub_carry_set_flags(cpu, cpu.a, byte);
}

fn rst_18h(cpu: &mut Cpu) {
    rst(cpu, 0x0018);
}

fn ld_mff00u8_a(cpu: &mut Cpu) {
    let byte = cpu.read_u8();
    cpu.mmu.write(0xff00 + byte as u16, cpu.a);
}

fn pop_hl(cpu: &mut Cpu) {
    let word = cpu.pop_word();
    cpu.set_hl(word);
}

fn ld_mff00c_a(cpu: &mut Cpu) {
    cpu.mmu.write(0xff00 + cpu.c as u16, cpu.a);
}

fn push_hl(cpu: &mut Cpu) {
    cpu.push_word(cpu.hl());
}

fn and_a_u8(cpu: &mut Cpu) {
    let byte = cpu.read_u8();

    cpu.a &= byte;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(true);
    cpu.set_carry(false);
}

fn rst_20h(cpu: &mut Cpu) {
    rst(cpu, 0x0020);
}

fn add_sp_i8(cpu: &mut Cpu) {
    let sp = cpu.sp as i32;
    let byte = cpu.read_u8() as i8;
    let byte_i32 = byte as i32;

    let result = sp.wrapping_add(byte_i32);

    cpu.set_sub(false);
    cpu.set_zero(false);
    cpu.set_half_carry((sp ^ byte_i32 ^ result) & 0x10 == 0x10);
    cpu.set_carry((sp ^ byte_i32 ^ result) & 0x100 == 0x100);

    cpu.sp = result as u16;
}

fn jp_hl(cpu: &mut Cpu) {
    cpu.pc = cpu.hl();
}

fn ld_mu16_a(cpu: &mut Cpu) {
    let word = cpu.read_u16();
    cpu.mmu.write(word, cpu.a);
}

fn xor_a_u8(cpu: &mut Cpu) {
    let byte = cpu.read_u8();
    cpu.a ^= byte;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn rst_28h(cpu: &mut Cpu) {
    rst(cpu, 0x0028);
}

fn ld_a_mff00u8(cpu: &mut Cpu) {
    let byte = cpu.read_u8();
    cpu.a = cpu.mmu.read(0xff00 + byte as u16);
}

fn pop_af(cpu: &mut Cpu) {
    let word = cpu.pop_word();
    cpu.set_af(word);
}

fn ld_a_mff00c(cpu: &mut Cpu) {
    cpu.a = cpu.mmu.read(0xff00 + cpu.c as u16);
}

fn di(cpu: &mut Cpu) {
    cpu.disable_int();
}

fn push_af(cpu: &mut Cpu) {
    cpu.push_word(cpu.af());
}

fn or_a_u8(cpu: &mut Cpu) {
    let byte = cpu.read_u8();
    cpu.a |= byte;

    cpu.set_sub(false);
    cpu.set_zero(cpu.a == 0);
    cpu.set_half_carry(false);
    cpu.set_carry(false);
}

fn rst_30h(cpu: &mut Cpu) {
    rst(cpu, 0x0030);
}

fn ld_hl_spi8(cpu: &mut Cpu) {
    let sp = cpu.sp as i32;
    let byte = cpu.read_u8() as i8;
    let byte_i32 = byte as i32;

    let result = sp.wrapping_add(byte_i32);

    cpu.set_sub(false);
    cpu.set_zero(false);
    cpu.set_half_carry((sp ^ byte_i32 ^ result) & 0x10 == 0x10);
    cpu.set_carry((sp ^ byte_i32 ^ result) & 0x100 == 0x100);

    cpu.set_hl(result as u16);
}