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GBA Timer: Remove questionably accurate timer prefetch skew

This commit is contained in:
Vicki Pfau 2020-07-18 14:26:36 -07:00
parent 7025fbf84a
commit a8272480c1
1 changed files with 1 additions and 5 deletions
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6
src/gba/timer.c
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@ -105,11 +105,7 @@ void GBATimerInit(struct GBA* gba) {
void GBATimerUpdateRegister(struct GBA* gba, int timer, int32_t cyclesLate) {
struct GBATimer* currentTimer = &gba->timers[timer];
if (GBATimerFlagsIsEnable(currentTimer->flags) && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
int32_t prefetchSkew = cyclesLate;
if (gba->memory.lastPrefetchedPc > (uint32_t) gba->cpu->gprs[ARM_PC]) {
prefetchSkew += ((gba->memory.lastPrefetchedPc - gba->cpu->gprs[ARM_PC]) * gba->cpu->memory.activeSeqCycles16) / WORD_SIZE_THUMB;
}
GBATimerUpdateRegisterInternal(currentTimer, &gba->timing, &gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1], prefetchSkew);
GBATimerUpdateRegisterInternal(currentTimer, &gba->timing, &gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1], cyclesLate);
}
}