chore(cpu): add inline fn isHalted()

src/cpu.zig

@@ -148,6 +148,10 @@ pub const Arm7tdmi = struct {
         };
     }
 
+    pub inline fn isHalted(self: *const Self) bool {
+        return self.bus.io.haltcnt == .Halt;
+    }
+
     pub fn setCpsr(self: *Self, value: u32) void {
         if (value & 0x1F != self.cpsr.raw & 0x1F) self.changeModeFromIdx(@truncate(u5, value & 0x1F));
         self.cpsr.raw = value;

src/emu.zig

@@ -52,7 +52,7 @@ pub fn runFrame(sched: *Scheduler, cpu: *Arm7tdmi) void {
 
     while (true) {
         while (sched.tick < std.math.min(frame_end, sched.nextTimestamp())) {
-            if (cpu.bus.io.haltcnt == .Execute) cpu.step() else sched.tick += 1;
+            if (!cpu.isHalted()) cpu.step() else sched.tick += 1;
             cpu.handleDMATransfers();
         }