Emulator: Add opcode $a8/$af

src/cpu.cpp

@@ -75,6 +75,8 @@ void CPU::update()
 		case 0x32: ld8(); break;
 		case 0x36: ld8(); break;
 		case 0x3e: ld8(); break;
+		case 0xa8: xor8(); break;
+		case 0xaf: xor8(); break;
 		case 0xc3: jp16(); break;
 		case 0xc6: add(); break;
 		case 0xcd: call(); break;
@@ -116,6 +118,27 @@ void CPU::add()
 	}
 }
 
+void CPU::xor8()
+{
+	uint8_t opcode = pcRead();
+	switch (opcode) {
+	case 0xa8:
+		// XOR B, flags: Z 0 0 0
+		m_nf = m_hf = m_cf = 0;
+		m_a ^= m_b;
+		m_zf = m_a == 0;
+		break;
+	case 0xaf:
+		// XOR A, flags: 1 0 0 0
+		// A^A will always be 0
+		m_a = m_nf = m_hf = m_cf = 0;
+		m_zf = 1;
+		break;
+	default:
+		VERIFY_NOT_REACHED();
+	}
+}
+
 void CPU::ld8()
 {
 	uint8_t opcode = pcRead();

src/cpu.h

@@ -25,6 +25,7 @@ public:
 
 	// 8-bit
 	void add();
+	void xor8();
 
 	// 16-bit