GBA: Fix keypad IRQs not firing when extra buttons are pressed

CHANGES

@@ -39,6 +39,7 @@ Bugfixes:
  - GBA BIOS: Use core's VRAM variable instead of renderer's
  - GBA Savedata: Fix 512 byte EEPROM saving as 8kB (fixes mgba.io/i/877)
  - SDL: Fix potential race condition when pressing keys (fixes mgba.io/i/872)
+ - GBA: Fix keypad IRQs not firing when extra buttons are pressed
 Misc:
  - GBA Timer: Use global cycles for timers
  - GBA: Extend oddly-sized ROMs to full address space (fixes mgba.io/i/722)

src/gba/core.c

@@ -491,7 +491,6 @@ static void _GBACoreAddKeys(struct mCore* core, uint32_t keys) {
 static void _GBACoreClearKeys(struct mCore* core, uint32_t keys) {
 	struct GBACore* gbacore = (struct GBACore*) core;
 	gbacore->keys &= ~keys;
-	GBATestKeypadIRQ(core->board);
 }
 
 static int32_t _GBACoreFrameCounter(const struct mCore* core) {

src/gba/gba.c

@@ -755,19 +755,17 @@ void GBATestKeypadIRQ(struct GBA* gba) {
 		return;
 	}
 	int isAnd = keycnt & 0x8000;
-	uint16_t keyInput;
-
 	if (!gba->keySource) {
 		// TODO?
 		return;
 	}
 
 	keycnt &= 0x3FF;
-	keyInput = *gba->keySource;
+	uint16_t keyInput = *gba->keySource & keycnt;
 
 	if (isAnd && keycnt == keyInput) {
 		GBARaiseIRQ(gba, IRQ_KEYPAD);
-	} else if (!isAnd && keycnt & keyInput) {
+	} else if (!isAnd && keyInput) {
 		GBARaiseIRQ(gba, IRQ_KEYPAD);
 	}
 }