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op_ctrl.go
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op_ctrl.go
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package z80
import "math/bits"
// port from WebMSX.
// See https://github.com/ppeccin/WebMSX/blob/654e3aa303e84404fba4a89d5fa21fae32753cf5/src/main/msx/cpu/CPU.js#L1010-L1030
func oopDAA(cpu *CPU) {
r := cpu.AF.Hi
c := cpu.flagC()
if cpu.flagN() {
if cpu.flagH() || (cpu.AF.Hi&0x0f) > 9 {
r -= 0x06
}
if c || (cpu.AF.Hi > 0x99) {
r -= 0x60
}
} else {
if cpu.flagH() || (cpu.AF.Hi&0x0f) > 9 {
r += 0x06
}
if c || (cpu.AF.Hi > 0x99) {
r += 0x60
}
}
var nand uint8 = maskS53 | maskZ | maskH | maskPV
var or uint8
or |= uint8(r) & maskS53
if uint8(r) == 0 {
or |= maskZ
}
or |= (cpu.AF.Hi ^ r) & maskH
or |= (uint8(bits.OnesCount8(r)%2) - 1) & maskPV
if cpu.AF.Hi > 0x99 {
or |= maskC
}
cpu.AF.Lo = cpu.AF.Lo&^nand | or
cpu.AF.Hi = r
}
func oopHALT(cpu *CPU) {
cpu.HALT = true
}
func oopEI(cpu *CPU) {
cpu.IFF1 = true
cpu.IFF2 = true
}
func oopCPL(cpu *CPU) {
cpu.AF.Hi = ^cpu.AF.Hi
var nand uint8 = mask53
var or uint8
or |= cpu.AF.Hi & mask53
or |= maskH | maskN
cpu.AF.Lo = cpu.AF.Lo&^nand | or
}
func oopNEG(cpu *CPU) {
a := cpu.AF.Hi
r := ^a + 1
cpu.AF.Hi = r
var nand uint8 = maskS53 | maskZ | maskH | maskPV | maskN | maskC
var or uint8
or |= r & maskS53
if r == 0 {
or |= maskZ
}
if r&0x0f != 0 {
or |= maskH
}
if a == 0x80 {
or |= maskPV
}
or |= maskN
if a != 0x00 {
or |= maskC
}
cpu.AF.Lo = cpu.AF.Lo&^nand | or
}
func oopCCF(cpu *CPU) {
var nand uint8 = mask53 | maskH | maskN | maskC
var or uint8
or |= cpu.AF.Hi & mask53
if cpu.flagC() {
or |= maskH
} else {
or |= maskC
}
cpu.AF.Lo = cpu.AF.Lo&^nand | or
}
func oopSCF(cpu *CPU) {
var nand uint8 = mask53 | maskH | maskN | maskC
var or uint8
or |= cpu.AF.Hi & mask53
or |= maskC
cpu.AF.Lo = cpu.AF.Lo&^nand | or
}
func oopNOP(cpu *CPU) {
// do nothing.
}
func oopDI(cpu *CPU) {
cpu.IFF1 = false
cpu.IFF2 = false
}
func oopIM0(cpu *CPU) {
cpu.IM = 0
}
func oopIM1(cpu *CPU) {
cpu.IM = 1
}
func oopIM2(cpu *CPU) {
cpu.IM = 2
}