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APU: Seemingly obvious optimization.

This commit is contained in:
Brandon Wright 2019-02-21 12:42:27 -06:00
parent 3469bd86eb
commit f24ca1f8a2
2 changed files with 25 additions and 3 deletions
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25
apu/bapu/smp/core.cpp
View File

@ -49,14 +49,33 @@ void SMP::op_write(uint16 addr, uint8 data) {
apuram[addr] = data; //all writes go to RAM, even MMIO writes
}
uint8 SMP::op_readpc() {
#if defined(CYCLE_ACCURATE)
tick();
#endif
if (regs.pc >= 0xffc0 && status.iplrom_enable) return iplrom[regs.pc++ & 0x3f];
return apuram[regs.pc++];
}
uint8 SMP::op_readstack() {
#if defined(CYCLE_ACCURATE)
tick();
#endif
return apuram[0x0100 | ++regs.sp];
}
void SMP::op_writestack(uint8 data) {
#if defined(CYCLE_ACCURATE)
tick();
#endif
apuram[0x0100 | regs.sp--] = data;
}
void SMP::op_step() {
#define op_readpc() op_read(regs.pc++)
#define op_readdp(addr) op_read((regs.p.p << 8) + ((addr) & 0xff))
#define op_writedp(addr, data) op_write((regs.p.p << 8) + ((addr) & 0xff), data)
#define op_readaddr(addr) op_read(addr)
#define op_writeaddr(addr, data) op_write(addr, data)
#define op_readstack() op_read(0x0100 | ++regs.sp)
#define op_writestack(data) op_write(0x0100 | regs.sp--, data)
#if defined(CYCLE_ACCURATE)
#if defined(PSEUDO_CYCLE)

3
apu/bapu/smp/smp.hpp
View File

@ -102,6 +102,9 @@ public:
debugvirtual alwaysinline uint8 op_read(uint16 addr);
debugvirtual alwaysinline void op_write(uint16 addr, uint8 data);
debugvirtual alwaysinline void op_step();
alwaysinline uint8 op_readpc();
alwaysinline uint8 op_readstack();
alwaysinline void op_writestack(uint8 data);
static const unsigned cycle_count_table[256];
uint64 cycle_table_cpu[256];
unsigned cycle_table_dsp[256];