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move parity into PROGMEM

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This commit is contained in:
Stephen Crane 2019-02-24 12:29:18 +00:00
parent a275deb6ab
commit 066a82e93c
2 changed files with 7 additions and 7 deletions
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6
i8080.cpp
View File

@ -84,7 +84,7 @@ void i8080::daa() {
flags.C = c;
}
int i8080::parity_table[] = {
const uint8_t parity_table[] PROGMEM = {
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,
@ -103,8 +103,8 @@ int i8080::parity_table[] = {
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
};
i8080::i8080(Memory &m, PortDevice<i8080> &d): CPU(m), _ports(&d)
{
uint8_t parity_tbl(uint8_t r) {
return pgm_read_byte(parity_table + r);
}
void i8080::_op(uint8_t op) {

8
i8080.h
View File

@ -5,9 +5,11 @@
#undef PC
#undef SP
uint8_t parity_tbl(uint8_t);
class i8080: public CPU {
public:
i8080(Memory &, PortDevice<i8080> &);
i8080(Memory &m, PortDevice<i8080> &d): CPU(m), _ports(&d) {}
void run(unsigned);
void reset();
@ -62,8 +64,6 @@ private:
void _op(uint8_t op);
static int parity_table[256];
inline uint16_t _rw(Memory::address a) {
return _mem[a] + (_mem[a+1] << 8);
}
@ -76,7 +76,7 @@ private:
inline void _szp(uint8_t r) {
flags.S = ((r & 0x80) != 0);
flags.Z = (r == 0);
flags.P = parity_table[r];
flags.P = parity_tbl(r);
}
inline void _szhp(uint8_t b, uint8_t r) {