2 files changed, 42 insertions, 0 deletions
diff --git a/src/runtime.c b/src/runtime.c
index 57101e0..d938c46 100644
--- a/src/runtime.c
+++ b/src/runtime.c
@@ -335,3 +335,34 @@ data_t vm_pop_word(vm_t *vm)
   }
   return DWORD(w);
 }
+
+void vm_not_byte(vm_t *vm)
+{
+  if (vm->stack.ptr == 0)
+    // TODO: Error STACK_UNDERFLOW
+    return;
+
+  byte a = vm_pop_byte(vm).as_byte;
+  vm_push_byte(vm, DBYTE(!a));
+}
+
+void vm_not_hword(vm_t *vm)
+{
+  if (vm->stack.ptr < HWORD_SIZE)
+    // TODO: Error STACK_UNDERFLOW
+    return;
+
+  hword a = vm_pop_hword(vm).as_hword;
+  vm_push_hword(vm, DHWORD(!a));
+}
+
+void vm_not_word(vm_t *vm)
+{
+  if (vm->stack.ptr < WORD_SIZE)
+    // TODO: Error STACK_UNDERFLOW
+    return;
+
+  word a = vm_pop_word(vm).as_word;
+  vm_push_word(vm, DWORD(!a));
+}
+
diff --git a/src/runtime.h b/src/runtime.h
index 8ff0142..4a2f849 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -100,4 +100,15 @@ static const pop_f POP_ROUTINES[] = {
     [OP_POP_WORD]  = vm_pop_word,
 };
 
+void vm_not_byte(vm_t *);
+void vm_not_hword(vm_t *);
+void vm_not_word(vm_t *);
+
+typedef void (*not_f)(vm_t *);
+static const not_f NOT_ROUTINES[] = {
+    [OP_NOT_BYTE]  = vm_not_byte,
+    [OP_NOT_HWORD] = vm_not_hword,
+    [OP_NOT_WORD]  = vm_not_word,
+};
+
 #endif