M CHANGES → CHANGES

@@ -65,6 +65,7 @@ - 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
+ - SM83: HALT should not consume an extra T-state
 Other fixes:
  - 3DS: Fix thread cleanup
  - All: Improve export headers (fixes mgba.io/i/1738)

M src/sm83/isa-sm83.c → src/sm83/isa-sm83.c

@@ -761,7 +761,10 @@ cpu->f.c = low;)
 
 DEFINE_INSTRUCTION_SM83(DI, cpu->irqh.setInterrupts(cpu, false));
 DEFINE_INSTRUCTION_SM83(EI, cpu->irqh.setInterrupts(cpu, true));
-DEFINE_INSTRUCTION_SM83(HALT, cpu->irqh.halt(cpu));
+DEFINE_INSTRUCTION_SM83(HALT,
+	cpu->irqh.halt(cpu);
+	// XXX: Subtract the cycles that will be added later in the tick function
+	cpu->cycles -= cpu->tMultiplier;);
 
 #define DEFINE_RST_INSTRUCTION_SM83(VEC) \
 	DEFINE_INSTRUCTION_SM83(RST ## VEC ## UpdateSPL, \