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SM83: Improve mid-M-cycle interrupts

This commit is contained in:
Vicki Pfau 2021-03-17 18:12:37 -07:00
parent f853de37b9
commit 039a64ee62
2 changed files with 14 additions and 5 deletions
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1
CHANGES
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@ -64,6 +64,7 @@ Emulation fixes:
- GBA Video: Emulate sprite cycle limits in OpenGL renderer (fixes mgba.io/i/1635)
- GBA Video: Fix OBJWIN erratic rendering in OpenGL renderer
- SM83: Emulate HALT bug
- SM83: Improve mid-M-cycle interrupts
Other fixes:
- 3DS: Fix thread cleanup
- All: Improve export headers (fixes mgba.io/i/1738)

18
src/sm83/sm83.c
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@ -153,11 +153,19 @@ static inline bool _SM83TickInternal(struct SM83Core* cpu) {
_SM83Step(cpu);
int t = cpu->tMultiplier;
if (cpu->cycles + t * 2 >= cpu->nextEvent) {
int32_t diff = cpu->nextEvent - cpu->cycles;
cpu->cycles = cpu->nextEvent;
cpu->executionState += diff >> (t - 1); // NB: This assumes tMultiplier is either 1 or 2
cpu->irqh.processEvents(cpu);
cpu->cycles += (SM83_CORE_EXECUTE - cpu->executionState) * t;
if (cpu->cycles >= cpu->nextEvent) {
cpu->irqh.processEvents(cpu);
}
cpu->cycles += t;
++cpu->executionState;
if (cpu->cycles >= cpu->nextEvent) {
cpu->irqh.processEvents(cpu);
}
cpu->cycles += t;
++cpu->executionState;
if (cpu->cycles >= cpu->nextEvent) {
cpu->irqh.processEvents(cpu);
}
running = false;
} else {
cpu->cycles += t * 2;