✨ Added increment ↗️ and decrement ↘️ and fixed flags

main.py

@@ -34,6 +34,7 @@ class ZombieCPU:
     def exec(self):
         Halted = False
         while not Halted: #change this to if not halt
+
             #fetch
             opcode = self._memory[int(self._regs.eip)]
             address = self._memory[int(self._regs.eip + 1)]
@@ -58,15 +59,8 @@ class ZombieCPU:
                 
             elif opcode == ops.LDI: #mov but actually load immediate
                 self.write_memory(address, value)
-                if value == 0:
-                    self._regs.flags = self._regs.flags | 0b00000001
-                else:
-                    print('unset flag here (you shouldnt be reading this!) (zero)')
-                
-                if value < 0:
-                    self._regs.flags = self._regs.flags | 0b00000010
-                else:
-                    print('unset flag here (you shouldnt be reading this!) (neg)')
+                self.flags_zero(value)
+                self.flags_negative(value)
 
             elif opcode == ops.PUSH: #push
                 self.write_memory(self._regs.esp, value) #put value onto stack
@@ -84,15 +78,39 @@ class ZombieCPU:
                     self._regs.eip = address - 3
             
             elif opcode == ops.CMP:
-                if address - value == 0:
-                    self._regs.flags = self._regs.flags | 0b00000001 #set zero flag
-                else:
-                    print('unset flag here (you shouldnt be reading this!) (zero)')
-                print(self._regs.flags)
+                self.flags_zero(address - value)
+
+            elif opcode == ops.INC:
+                self.write_memory(address, self.read_memory_address(address) + 1)
+                self.flags_zero(self.read_memory_address(address))
+                self.flags_negative(self.read_memory_address(address))
+                
+            elif opcode == ops.DEC:
+                self.write_memory(address, self.read_memory_address(address) - 1)
+                self.flags_zero(self.read_memory_address(address))
+                self.flags_negative(self.read_memory_address(address))
                 
             self._regs.eip += 3 #increment instruction pointer
             
 
+    #flag shit
+    def read_flags(self, i):
+        return self._regs
+
+    def flags_zero(self, value):
+        if value == 0:
+            self._regs.flags = self._regs.flags | 0b00000001
+        else:
+            self._regs.flags = self._regs.flags & ~0b00000001
+    def flags_negative(self, value):
+        if value < 0:
+            self._regs.flags = self._regs.flags | 0b00000010
+        else:
+            self._regs.flags = self._regs.flags & ~0b00000010
+
+
+
+    #memory
     def set_memory(self, memory):
         self._memory = memory
     def write_memory(self, address, value):
@@ -101,8 +119,6 @@ class ZombieCPU:
         return self._memory
     def read_memory_address(self, address):
         return self._memory[int(address)]
-    def read_flags(self, i):
-        return self._regs
     
 if __name__ == "__main__":
     cpu = ZombieCPU(65536, False)
@@ -121,10 +137,14 @@ if __name__ == "__main__":
     cpu.write_memory(265, ops.CMP)
     cpu.write_memory(266, 10)
     cpu.write_memory(267, 11)   #should set the zero flag
-    cpu.write_memory(268, ops.HLT)
+    cpu.write_memory(268, ops.INC) #increment
+    cpu.write_memory(269, 100)
+    cpu.write_memory(270, 0) #unused
+    cpu.write_memory(271, ops.HLT)
 
     cpu.exec()
     
+    print(cpu.read_memory_address(100))
 
     #c = Console(cpu.read_memory()) ima finish this later
     #c.draw()

opcodes.py

@@ -8,3 +8,5 @@ POP     = 6 # Pop
 JMP     = 7 # Jump to address
 JZ      = 8 # Jump to address if zero
 CMP     = 9 # Compare and set zero flag
+INC     = 10    # increment
+DEC     = 11    # decrement