Fix bug in NEG cpu state

Was not updating C carry flag

Author: boriel

src/arch/zx48k/optimizer/cpustate.py

@@ -693,6 +693,7 @@ def execute(self, asm_code):
             val = -self.getv('a')
             self.set('a', val)
             self.Z = int(not val)
+            self.C = int(not self.Z)
             val &= 0xFF
             self.S = val >> 7
             return

tests/arch/zx48k/optimizer/test_cpustate.py

@@ -362,3 +362,25 @@ def test_ex_de_hl_unknown(self):
         self.assertEqual(self.regs['l'], helpers.LO16_val(self.cpu_state.mem['y']))
         self.assertEqual(self.regs['d'], helpers.HI16_val(self.cpu_state.mem['x']))
         self.assertEqual(self.regs['e'], helpers.LO16_val(self.cpu_state.mem['x']))
+
+    def test_neg_nz(self):
+        code = """
+        xor a
+        ld a, 1
+        neg
+        """
+        self._eval(code)
+        self.assertEqual(self.regs['a'], str(0xFF))
+        self.assertEqual(self.cpu_state.C, 1)
+        self.assertEqual(self.cpu_state.Z, 0)
+
+    def test_neg_z(self):
+        code = """
+        xor a
+        cp 1
+        neg
+        """
+        self._eval(code)
+        self.assertEqual(self.regs['a'], str(0))
+        self.assertEqual(self.cpu_state.C, 0)
+        self.assertEqual(self.cpu_state.Z, 1)