6502/EightBit
1
0
Fork 0
mirror of https://github.com/MoleskiCoder/EightBit.git synced 2026-04-20 10:16:48 +00:00
Code Issues Projects Releases Wiki Activity

More tidying of shareable code

Browse Source
This commit is contained in:
Adrian.Conlon
2017-06-12 14:33:00 +01:00
parent 8f3aef1c3e
commit 828e081a6e
3 changed files with 100 additions and 89 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Z80/src/Z80.cpp
+60 -52
View File
@@ -619,26 +619,28 @@ void EightBit::Z80::cpd() {
MEMPTR().word--;
}
void EightBit::Z80::cpir() {
bool EightBit::Z80::cpir() {
cpi();
if ((F() & PF) && !(F() & ZF)) { // See CPI
cycles += 5;
MEMPTR().word = pc.word;
auto again = (F() & PF) && !(F() & ZF); // See CPI
if (again) {
MEMPTR().word--;
pc.word -= 2;
MEMPTR().word = pc.word + 1;
} else {
MEMPTR().word = pc.word;
}
return again;
}
void EightBit::Z80::cpdr() {
bool EightBit::Z80::cpdr() {
cpd();
if ((F() & PF) && !(F() & ZF)) { // See CPD
cycles += 5;
MEMPTR().word = pc.word;
auto again = (F() & PF) && !(F() & ZF); // See CPD
if (again) {
MEMPTR().word--;
pc.word -= 2;
MEMPTR().word = pc.word + 1;
} else {
MEMPTR().word = pc.word - 2;
MEMPTR().word -= 2;
}
return again;
}
#pragma endregion Block compare instructions
@@ -669,22 +671,24 @@ void EightBit::Z80::ldi() {
DE().word++;
}
void EightBit::Z80::ldir() {
bool EightBit::Z80::ldir() {
ldi();
if (F() & PF) { // See LDI
cycles += 5;
auto again = (F() & PF) != 0;
if (again) { // See LDI
MEMPTR().word = pc.word - 1;
pc.word -= 2;
MEMPTR().word = pc.word + 1;
}
return again;
}
void EightBit::Z80::lddr() {
bool EightBit::Z80::lddr() {
ldd();
auto again = (F() & PF) != 0;
if (F() & PF) { // See LDR
cycles += 5;
MEMPTR().word = pc.word - 1;
pc.word -= 2;
MEMPTR().word = pc.word + 1;
}
return again;
}
#pragma endregion Block load instructions
@@ -713,20 +717,20 @@ void EightBit::Z80::ind() {
setFlag(NF);
}
void EightBit::Z80::inir() {
bool EightBit::Z80::inir() {
ini();
if (!(F() & ZF)) { // See INI
cycles += 5;
auto again = !(F() & ZF); // See INI
if (again)
pc.word -= 2;
}
return again;
}
void EightBit::Z80::indr() {
bool EightBit::Z80::indr() {
ind();
if (!(F() & ZF)) { // See IND
cycles += 5;
auto again = !(F() & ZF); // See IND
if (again)
pc.word -= 2;
}
return again;
}
#pragma endregion Block input instructions
@@ -755,20 +759,20 @@ void EightBit::Z80::outd() {
MEMPTR().word = BC().word - 1;
}
void EightBit::Z80::otir() {
bool EightBit::Z80::otir() {
outi();
if (!(F() & ZF)) { // See OUTI
cycles += 5;
auto again = !(F() & ZF); // See OUTI
if (again)
pc.word -= 2;
}
return again;
}
void EightBit::Z80::otdr() {
bool EightBit::Z80::otdr() {
outd();
if (!(F() & ZF)) { // See OUTD
cycles += 5;
auto again = !(F() & ZF); // See OUTD
if (again)
pc.word -= 2;
}
return again;
}
#pragma endregion Block output instructions
@@ -778,9 +782,8 @@ void EightBit::Z80::otdr() {
#pragma region Nibble rotation
void EightBit::Z80::rrd() {
MEMPTR() = m_memory.ADDRESS() = HL();
MEMPTR().word++;
auto memory = m_memory.reference();
MEMPTR() = HL();
auto memory = getViaMemptr();
auto accumulator = A();
A() = (accumulator & 0xf0) | lowNibble(memory);
uint8_t updated = promoteNibble(lowNibble(accumulator)) | highNibble(memory);
@@ -790,9 +793,8 @@ void EightBit::Z80::rrd() {
}
void EightBit::Z80::rld() {
MEMPTR() = m_memory.ADDRESS() = HL();
MEMPTR().word++;
auto memory = m_memory.reference();
MEMPTR() = HL();
auto memory = getViaMemptr();
auto accumulator = A();
uint8_t updated = lowNibble(accumulator) | promoteNibble(memory);
A() = (accumulator & 0xf0) | highNibble(memory);
@@ -909,13 +911,11 @@ void EightBit::Z80::executeCB(int x, int y, int z, int p, int q) {
}
break;
}
if (m_prefixDD || m_prefixFD)
adjustSZP(DISPLACED());
else
adjustSZP(R(z));
if (m_prefixDD || m_prefixFD) {
adjustSZP(DISPLACED());
cycles += 23;
} else {
adjustSZP(R(z));
cycles += 8;
if (z == 6)
cycles += 7;
@@ -1103,10 +1103,12 @@ void EightBit::Z80::executeED(int x, int y, int z, int p, int q) {
ldd();
break;
case 6: // LDIR
ldir();
if (ldir())
cycles += 5;
break;
case 7: // LDDR
lddr();
if (lddr())
cycles += 5;
break;
}
break;
@@ -1119,10 +1121,12 @@ void EightBit::Z80::executeED(int x, int y, int z, int p, int q) {
cpd();
break;
case 6: // CPIR
cpir();
if (cpir())
cycles += 5;
break;
case 7: // CPDR
cpdr();
if (cpdr())
cycles += 5;
break;
}
break;
@@ -1135,10 +1139,12 @@ void EightBit::Z80::executeED(int x, int y, int z, int p, int q) {
ind();
break;
case 6: // INIR
inir();
if (inir())
cycles += 5;
break;
case 7: // INDR
indr();
if (indr())
cycles += 5;
break;
}
break;
@@ -1151,10 +1157,12 @@ void EightBit::Z80::executeED(int x, int y, int z, int p, int q) {
outd();
break;
case 6: // OTIR
otir();
if (otir())
cycles += 5;
break;
case 7: // OTDR
otdr();
if (otdr())
cycles += 5;
break;
}
break;