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sh2 timer optimization

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This commit is contained in:
kub 2020-04-13 22:20:13 +02:00
parent 7c1c9c7742
commit 74cc7aebf6
5 changed files with 40 additions and 32 deletions
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44
pico/32x/sh2soc.c
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@ -209,6 +209,9 @@ void p32x_timers_recalc(void)
// SH2 timer step
for (i = 0; i < 2; i++) {
sh2s[i].state &= ~SH2_TIMER_RUN;
if (PREG8(sh2s[i].peri_regs, 0x80) & 0x20) // TME
sh2s[i].state |= SH2_TIMER_RUN;
tmp = PREG8(sh2s[i].peri_regs, 0x80) & 7;
// Sclk cycles per timer tick
if (tmp)
@ -222,32 +225,29 @@ void p32x_timers_recalc(void)
}
}
void p32x_timers_do(unsigned int m68k_slice)
NOINLINE void p32x_timer_do(SH2 *sh2, unsigned int m68k_slice)
{
unsigned int cycles = m68k_slice * 3;
int cnt, i;
void *pregs = sh2->peri_regs;
int cnt; int i = sh2->is_slave;
// WDT timers
for (i = 0; i < 2; i++) {
void *pregs = sh2s[i].peri_regs;
if (PREG8(pregs, 0x80) & 0x20) { // TME
timer_cycles[i] += cycles;
// cnt = timer_cycles[i] / timer_tick_cycles[i];
cnt = (1ULL * timer_cycles[i] * timer_tick_factor[i]) >> 32;
timer_cycles[i] -= timer_tick_cycles[i] * cnt;
if (timer_cycles[i] > timer_tick_cycles[i])
timer_cycles[i] -= timer_tick_cycles[i], cnt++;
cnt += PREG8(pregs, 0x81);
if (cnt >= 0x100) {
int level = PREG8(pregs, 0xe3) >> 4;
int vector = PREG8(pregs, 0xe4) & 0x7f;
elprintf(EL_32XP, "%csh2 WDT irq (%d, %d)",
i ? 's' : 'm', level, vector);
sh2_internal_irq(&sh2s[i], level, vector);
cnt &= 0xff;
}
PREG8(pregs, 0x81) = cnt;
// WDT timer
timer_cycles[i] += cycles;
if (timer_cycles[i] > timer_tick_cycles[i]) {
// cnt = timer_cycles[i] / timer_tick_cycles[i];
cnt = (1ULL * timer_cycles[i] * timer_tick_factor[i]) >> 32;
timer_cycles[i] -= timer_tick_cycles[i] * cnt;
cnt += PREG8(pregs, 0x81);
if (cnt >= 0x100) {
int level = PREG8(pregs, 0xe3) >> 4;
int vector = PREG8(pregs, 0xe4) & 0x7f;
elprintf(EL_32XP, "%csh2 WDT irq (%d, %d)",
i ? 's' : 'm', level, vector);
sh2_internal_irq(sh2, level, vector);
cnt &= 0xff;
}
PREG8(pregs, 0x81) = cnt;
}
}