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drz80: drop fast_sp for compatibility

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no measurable improvement in most cases anyway
This commit is contained in:
notaz 2017-08-11 02:12:57 +03:00
parent 20a10d3ed9
commit 61290a3553
2 changed files with 20 additions and 3 deletions
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4
cpu/DrZ80/drz80.s
View file

@ -12,7 +12,7 @@
.global DrZ80Ver
.equiv INTERRUPT_MODE, 0 ;@0 = Use internal int handler, 1 = Use Mames int handler
.equiv FAST_Z80SP, 1 ;@0 = Use mem functions for stack pointer, 1 = Use direct mem pointer
.equiv FAST_Z80SP, 0 ;@0 = Use mem functions for stack pointer, 1 = Use direct mem pointer
.equiv UPDATE_CONTEXT, 0
.equiv DRZ80_XMAP, 1
.equiv DRZ80_XMAP_MORE_INLINE, 1
@ -212,6 +212,7 @@ z80_bad_jump:
mov z80pc,r0
ldmfd sp!,{r3,r12,pc}
.if FAST_Z80SP
z80_xmap_rebase_sp:
ldr r1,[cpucontext,#z80_read8]
sub r2,r0,#1
@ -228,6 +229,7 @@ z80_xmap_rebase_sp:
ldr pc,[cpucontext,#z80_rebaseSP]
mov z80sp,r0
ldmfd sp!,{r3,r12,pc}
.endif @ FAST_Z80SP
.endif @ DRZ80_XMAP

19
pico/z80if.c
View file

@ -14,9 +14,11 @@ uptr z80_read_map [0x10000 >> Z80_MEM_SHIFT];
uptr z80_write_map[0x10000 >> Z80_MEM_SHIFT];
#ifdef _USE_DRZ80
struct DrZ80 drZ80;
// this causes trouble in some cases, like doukutsu putting sp in bank area
// no perf difference for most, upto 1-2% for some others
//#define FAST_Z80SP
static u32 drz80_sp_base;
struct DrZ80 drZ80;
static void drz80_load_pcsp(u32 pc, u32 sp)
{
@ -28,6 +30,8 @@ static void drz80_load_pcsp(u32 pc, u32 sp)
drZ80.Z80PC_BASE <<= 1;
drZ80.Z80PC = drZ80.Z80PC_BASE + pc;
}
drZ80.Z80SP = sp;
#ifdef FAST_Z80SP
drZ80.Z80SP_BASE = z80_read_map[sp >> Z80_MEM_SHIFT];
if (drZ80.Z80SP_BASE & (1<<31)) {
elprintf(EL_STATUS|EL_ANOMALY, "load_pcsp: bad SP: %04x", sp);
@ -37,6 +41,7 @@ static void drz80_load_pcsp(u32 pc, u32 sp)
drZ80.Z80SP_BASE <<= 1;
drZ80.Z80SP = drZ80.Z80SP_BASE + sp;
}
#endif
}
// called only if internal xmap rebase fails
@ -47,13 +52,19 @@ static unsigned int dz80_rebase_pc(unsigned short pc)
return drZ80.Z80PC_BASE;
}
#ifdef FAST_Z80SP
static u32 drz80_sp_base;
static unsigned int dz80_rebase_sp(unsigned short sp)
{
elprintf(EL_STATUS|EL_ANOMALY, "dz80_rebase_sp: fail on %04x", sp);
drZ80.Z80SP_BASE = z80_read_map[drz80_sp_base >> Z80_MEM_SHIFT] << 1;
return drZ80.Z80SP_BASE + (1 << Z80_MEM_SHIFT) - 0x100;
}
#else
#define dz80_rebase_sp NULL
#endif
#endif // _USE_DRZ80
void z80_init(void)
@ -91,9 +102,11 @@ void z80_reset(void)
drZ80.Z80IX = 0xFFFF << 16;
drZ80.Z80IY = 0xFFFF << 16;
*/
#ifdef FAST_Z80SP
// drZ80 is locked in single bank
drz80_sp_base = (PicoAHW & PAHW_SMS) ? 0xc000 : 0x0000;
drZ80.Z80SP_BASE = z80_read_map[drz80_sp_base >> Z80_MEM_SHIFT] << 1;
#endif
if (PicoAHW & PAHW_SMS)
drZ80.Z80SP = drZ80.Z80SP_BASE + 0xdff0; // simulate BIOS
// XXX: since we use direct SP pointer, it might make sense to force it to RAM,
@ -286,3 +299,5 @@ void z80_debug(char *dstr)
sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", (unsigned int)(CZ80.PC - CZ80.BasePC), CZ80.SP.W);
#endif
}
// vim:ts=2:sw=2:expandtab