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parity table

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This commit is contained in:
Stephen Crane 2019-02-25 12:23:14 +00:00
parent 4063ecaba5
commit bdd84b908c
2 changed files with 22 additions and 28 deletions
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46
z80.cpp
View File

@ -136,7 +136,7 @@ void z80::daa() {
else
_add(a);
flags.C = c;
flags.P = parity_table[A];
flags.P = parity_table(A);
}
void z80::_step_idx(OP_IDX ops[]) {
@ -641,7 +641,7 @@ void z80::ed() {
c = b + C + 1;
flags.N = (b & 0x80) != 0;
flags.C = flags.H = (c < b);
flags.P = parity_table[(c & 0x07) ^ B];
flags.P = parity_table((c & 0x07) ^ B);
_sz35(B);
break;
case 0xa3:
@ -653,7 +653,7 @@ void z80::ed() {
c = b + L;
flags.N = (b & 0x80) != 0;
flags.C = flags.H = (c < b);
flags.P = parity_table[(c & 0x07) ^ B];
flags.P = parity_table((c & 0x07) ^ B);
_sz35(B);
break;
case 0xa8:
@ -694,7 +694,7 @@ void z80::ed() {
c = b + C - 1;
flags.N = (b & 0x80) != 0;
flags.C = flags.H = (c < b);
flags.P = parity_table[(c & 0x07) ^ B];
flags.P = parity_table((c & 0x07) ^ B);
_sz35(B);
break;
case 0xab:
@ -706,7 +706,7 @@ void z80::ed() {
c = b + L;
flags.N = (b & 0x80) != 0;
flags.C = flags.H = (c < b);
flags.P = parity_table[(c & 0x07) ^ B];
flags.P = parity_table((c & 0x07) ^ B);
_sz35(B);
break;
case 0xb0:
@ -758,7 +758,7 @@ void z80::ed() {
c = b + flags.C + 1;
flags.N = (c & 0x80) != 0;
flags.C = flags.H = (c < b);
flags.P = parity_table[(c & 0x07) ^ B];
flags.P = parity_table((c & 0x07) ^ B);
_sz35(B);
if (B) {
_mc(HL, 1); _mc(HL, 1); _mc(HL, 1);
@ -776,7 +776,7 @@ void z80::ed() {
c = b + L;
flags.N = (b & 0x80) != 0;
flags.C = flags.H = (c < b);
flags.P = parity_table[(c & 0x07) ^ B];
flags.P = parity_table((c & 0x07) ^ B);
_sz35(B);
if (B) {
_mc(BC, 1); _mc(BC, 1); _mc(BC, 1);
@ -829,7 +829,7 @@ void z80::ed() {
c = b + flags.C + 1;
flags.N = (c & 0x80) != 0;
flags.C = flags.H = (c < b);
flags.P = parity_table[(c & 0x07) ^ B];
flags.P = parity_table((c & 0x07) ^ B);
_sz35(B);
if (B) {
_mc(HL, 1); _mc(HL, 1); _mc(HL, 1);
@ -847,7 +847,7 @@ void z80::ed() {
c = b + L;
flags.N = (b & 0x80) != 0;
flags.C = flags.H = (c < b);
flags.P = parity_table[(c & 0x07) ^ B];
flags.P = parity_table((c & 0x07) ^ B);
_sz35(B);
if (B) {
_mc(BC, 1); _mc(BC, 1); _mc(BC, 1);
@ -858,25 +858,19 @@ void z80::ed() {
}
}
int z80::parity_table[] = {
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
const uint8_t partab[] PROGMEM = {
0x69, 0x96, 0x96, 0x69, 0x96, 0x69, 0x69, 0x96,
0x96, 0x69, 0x69, 0x96, 0x69, 0x96, 0x96, 0x69,
0x96, 0x69, 0x69, 0x96, 0x69, 0x96, 0x96, 0x69,
0x69, 0x96, 0x96, 0x69, 0x96, 0x69, 0x69, 0x96,
};
uint8_t z80::parity_table(uint8_t r) {
uint8_t i = r / 8, b = pgm_read_byte(partab + i);
uint8_t m = (1 << (r % 8));
return m == (b & m);
}
z80::z80(Memory &m, PortDevice<z80> &ports): CPU(m)
{
_ports = &ports;

4
z80.h
View File

@ -144,7 +144,7 @@ private:
OP _ops[256], _cb[256];
OP_IDX _ddcb[256], _fdcb[256];
static int parity_table[256];
uint8_t parity_table(uint8_t);
inline uint8_t _rb(Memory::address a) {
#if defined(CPU_DEBUG)
@ -211,7 +211,7 @@ private:
inline void _szp35(uint8_t r) {
_sz35(r);
flags.P = parity_table[r];
flags.P = parity_table(r);
}
inline void _inc(uint8_t &b) {