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misc optimizations

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This commit is contained in:
StapleButter
2017-04-25 01:14:26 +02:00
parent 61798ac880
commit 9eb68c2ede
4 changed files with 33 additions and 22 deletions
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22
src/NDS.cpp
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@ -83,6 +83,7 @@ u16 PowerControl7;
u16 ARM7BIOSProt;
Timer Timers[8];
u8 TimerCheckMask[2];
DMA* DMAs[8];
u32 DMA9Fill[4];
@ -294,6 +295,8 @@ void Reset()
CPUStop = 0;
memset(Timers, 0, 8*sizeof(Timer));
TimerCheckMask[0] = 0;
TimerCheckMask[1] = 0;
for (i = 0; i < 8; i++) DMAs[i]->Reset();
memset(DMA9Fill, 0, 4*4);
@ -614,8 +617,8 @@ void HandleTimerOverflow(u32 tid)
void RunTimer(u32 tid, s32 cycles)
{
Timer* timer = &Timers[tid];
if ((timer->Cnt & 0x84) != 0x80)
return;
//if ((timer->Cnt & 0x84) != 0x80)
// return;
u32 oldcount = timer->Counter;
timer->Counter += (cycles << timer->CycleShift);
@ -625,10 +628,12 @@ void RunTimer(u32 tid, s32 cycles)
void RunTimingCriticalDevices(u32 cpu, s32 cycles)
{
RunTimer((cpu<<2)+0, cycles);
RunTimer((cpu<<2)+1, cycles);
RunTimer((cpu<<2)+2, cycles);
RunTimer((cpu<<2)+3, cycles);
register u32 timermask = TimerCheckMask[cpu];
if (timermask & 0x1) RunTimer((cpu<<2)+0, cycles);
if (timermask & 0x2) RunTimer((cpu<<2)+1, cycles);
if (timermask & 0x4) RunTimer((cpu<<2)+2, cycles);
if (timermask & 0x8) RunTimer((cpu<<2)+3, cycles);
if (cpu == 0)
{
@ -681,6 +686,11 @@ void TimerStart(u32 id, u16 cnt)
{
timer->Counter = timer->Reload << 16;
}
if ((cnt & 0x84) == 0x80)
TimerCheckMask[id>>2] |= (1<<(id&0x3));
else
TimerCheckMask[id>>2] &= ~(1<<(id&0x3));
}