#endif
}
-#define PS_STEP_M68K 8
-#define PS_STEP_S68K 13
+#define PS_STEP_M68K ((488<<16)/20) // ~24
+//#define PS_STEP_S68K 13
+#ifndef _ASM_CD_PICO_C
static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
{
- int cyc_do_m68k, cyc_do_s68k, it=0;
- int cyc_done_m68k=0, cyc_done_s68k=0;
+ int cycn, cycn_s68k, cyc_do;
+ int d_cm = 0, d_cs = 0, ex;
SekCycleAim+=cyc_m68k;
SekCycleAimS68k+=cyc_s68k;
- cyc_do_m68k=SekCycleAim-SekCycleCnt;
- cyc_do_s68k=SekCycleAimS68k-SekCycleCntS68k;
- while (cyc_done_m68k < cyc_do_m68k || cyc_done_s68k < cyc_do_s68k) {
- it++;
- if (cyc_done_m68k < cyc_do_m68k && it*PS_STEP_M68K > cyc_done_m68k) {
+
+// fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k,
+// SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline);
+
+ /* loop 488 downto 0 in steps of PS_STEP */
+ for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K)
+ {
+ ex = 0;
+ cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
+//fprintf(stderr, "%3i/%3i: ", cycn>>16, cycn_s68k);
+ if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
#if defined(EMU_C68K)
- PicoCpu.cycles = PS_STEP_M68K;
+ PicoCpu.cycles = cyc_do;
CycloneRun(&PicoCpu);
- cyc_done_m68k += PS_STEP_M68K - PicoCpu.cycles;
+ SekCycleCnt += cyc_do - PicoCpu.cycles;
#elif defined(EMU_M68K)
m68k_set_context(&PicoM68kCPU);
- cyc_done_m68k += m68k_execute(PS_STEP_M68K);
+ SekCycleCnt += (ex = m68k_execute(cyc_do));
#endif
- } //else dprintf("m68k skipping it #%i", it);
- if (cyc_done_s68k < cyc_do_s68k && it*PS_STEP_S68K > cyc_done_s68k) {
+ }
+//fprintf(stderr, "%3i ", ex); d_cm += ex; ex = 0;
+ if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
#if defined(EMU_C68K)
- PicoCpuS68k.cycles = PS_STEP_S68K;
+ PicoCpuS68k.cycles = cyc_do;
CycloneRun(&PicoCpuS68k);
- cyc_done_s68k += PS_STEP_S68K - PicoCpuS68k.cycles;
+ SekCycleCntS68k += cyc_do - PicoCpuS68k.cycles;
#elif defined(EMU_M68K)
m68k_set_context(&PicoS68kCPU);
- cyc_done_s68k += m68k_execute(PS_STEP_S68K);
+ SekCycleCntS68k += (ex = m68k_execute(cyc_do));
#endif
- } //else dprintf("s68k skipping it #%i", it);
+ }
+//fprintf(stderr, "%3i\n", ex); d_cs += ex;
}
- SekCycleCnt += cyc_done_m68k;
- SekCycleCntS68k += cyc_done_s68k;
- //dprintf("== end SekRunPS, it=%i ==", it);
+
+//fprintf(stderr, "== end %3i/%3i ==\n", d_cm, d_cs);
}
+#else
+void SekRunPS(int cyc_m68k, int cyc_s68k);
+#endif
static __inline void check_cd_dma(void)
//dprintf("m68k starting exec @ %06x", SekPc);
if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
if((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) {
- SekRunPS(cycles_68k, cycles_s68k); // "perfect sync"
+ SekRunPS(cycles_68k, cycles_s68k); // "better/perfect sync"
} else {
SekRun(cycles_68k);
if ((Pico_mcd->m.busreq&3) == 1) // no busreq/no reset