Bugfix/o3 local var bug

docs/released_programs.md

@@ -1060,7 +1060,7 @@ Year: 2013
 
 Source: Yes
 
-Link: [http://www.boriel.com/forum/post4353.html#p4353](http://www.boriel.com/forum/post4353.html#p4353)
+Link: [https://www.boriel.com/forum/showthread.php?tid=529&pid=3334#pid3334](https://www.boriel.com/forum/showthread.php?tid=529&pid=3334#pid3334)
 
 ![P3efilebrowser.png](./img/games/p3efilebrowser.png)
 
@@ -1075,7 +1075,7 @@ Year: 2014
 
 Source: Yes
 
-Link: [http://www.boriel.com/forum/gallery/show-off-your-creativity-t578-45.html#p5341](http://www.boriel.com/forum/gallery/show-off-your-creativity-t578-45.html#p5341)
+Link: [https://www.boriel.com/forum/showthread.php?tid=299&pid=4142#pid4142](https://www.boriel.com/forum/showthread.php?tid=299&pid=4142#pid4142)
 
 ![MultiIOboard.png](./img/games/multiioboard.png)
 
@@ -1090,7 +1090,7 @@ Year: 2015
 
 Source: No
 
-Link: [http://www.boriel.com/forum/gallery/the-spectrum-client-t972.html](http://www.boriel.com/forum/gallery/the-spectrum-client-t972.html)
+Link: [https://www.boriel.com/forum/showthread.php?tid=644](https://www.boriel.com/forum/showthread.php?tid=644)
 
 ![TheSpectrumClient.png](./img/games/thespectrumclient.png)
 

src/arch/zx48k/optimizer/cpustate.py

@@ -687,12 +687,14 @@ def execute(self, asm_code):
 
         if i == 'neg':
             if self.getv('a') is None:
+                self.set('a', None)
                 self.set_flag(None)
                 return
 
             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

@@ -18,6 +18,10 @@ def _eval(self, code):
     def regs(self):
         return self.cpu_state.regs
 
+    @property
+    def mem(self):
+        return self.cpu_state.mem
+
     def test_cpu_state_ld_a_unknown(self):
         code = """
         ld a, (_N)
@@ -349,7 +353,7 @@ def test_ex_de_hl(self):
         self.assertEqual(self.regs['d'], str(0x12))
         self.assertEqual(self.regs['e'], str(0x34))
 
-    def test_ex_de_hl_unkown(self):
+    def test_ex_de_hl_unknown(self):
         code = """
         ld hl, (x)
         ld de, (y)
@@ -362,3 +366,33 @@ def test_ex_de_hl_unkown(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)
+
+    def test_ix_neg(self):
+        code = """
+        ld a, (ix-1)
+        neg
+        """
+        self._eval(code)
+        self.assertNotEqual(self.regs['a'], self.mem['ix-1'])