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32x, small improvement for poll detection

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kub 2020-04-22 20:34:20 +02:00
parent 2eb213314a
commit 6432fb18ba
1 changed files with 3 additions and 2 deletions
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5
pico/32x/memory.c
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@ -114,12 +114,13 @@ void p32x_m68k_poll_event(u32 flags)
void NOINLINE p32x_sh2_poll_detect(u32 a, SH2 *sh2, u32 flags, int maxcnt) void NOINLINE p32x_sh2_poll_detect(u32 a, SH2 *sh2, u32 flags, int maxcnt)
{ {
u32 cycles_done = sh2_cycles_done_t(sh2); u32 cycles_done = sh2_cycles_done_t(sh2);
u32 cycles_diff = cycles_done - sh2->poll_cycles;
// reading 2 consecutive 16bit values is probably a 32bit access. detect this // reading 2 consecutive 16bit values is probably a 32bit access. detect this
// by checking address (max 2 bytes away) and cycles (max 2 cycles later). // by checking address (max 2 bytes away) and cycles (max 2 cycles later).
// no polling if more than 20 cycles have passed since last detect call. // no polling if more than 20 cycles have passed since last detect call.
if (a - sh2->poll_addr <= 2 && CYCLES_GE(sh2->poll_cycles+20, cycles_done)) { if (a - sh2->poll_addr <= 2 && CYCLES_GE(20, cycles_diff)) {
if (CYCLES_GT(cycles_done,sh2->poll_cycles+2) && ++sh2->poll_cnt >= maxcnt) { if (CYCLES_GT(cycles_diff, 2) && ++sh2->poll_cnt >= maxcnt) {
if (!(sh2->state & flags)) if (!(sh2->state & flags))
elprintf_sh2(sh2, EL_32X, "state: %02x->%02x", elprintf_sh2(sh2, EL_32X, "state: %02x->%02x",
sh2->state, sh2->state | flags); sh2->state, sh2->state | flags);