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32x, speed improvement

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This commit is contained in:
kub 2019-10-11 00:56:26 +02:00
parent 7869213d35
commit 86c16afd45
2 changed files with 28 additions and 17 deletions
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17
pico/32x/sh2soc.c
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@ -193,8 +193,9 @@ static void dmac_trigger(SH2 *sh2, struct dma_chan *chan)
}
// timer state - FIXME
static int timer_cycles[2];
static int timer_tick_cycles[2];
static u32 timer_cycles[2];
static u32 timer_tick_cycles[2];
static u32 timer_tick_factor[2];
// timers
void p32x_timers_recalc(void)
@ -211,6 +212,7 @@ void p32x_timers_recalc(void)
else
cycles = 2;
timer_tick_cycles[i] = cycles;
timer_tick_factor[i] = (1ULL << 32) / cycles;
timer_cycles[i] = 0;
elprintf(EL_32XP, "WDT cycles[%d] = %d", i, cycles);
}
@ -226,11 +228,12 @@ void p32x_timers_do(unsigned int m68k_slice)
void *pregs = sh2s[i].peri_regs;
if (PREG8(pregs, 0x80) & 0x20) { // TME
timer_cycles[i] += cycles;
cnt = PREG8(pregs, 0x81);
while (timer_cycles[i] >= timer_tick_cycles[i]) {
timer_cycles[i] -= timer_tick_cycles[i];
cnt++;
}
// 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;