Use M3_INC expression
# define slot_ptr(TYPE) (TYPE *) (_sp + immediate (i32))
#if M3_SIZEOF_PTR == 4
-# define constant64(TYPE) * ((TYPE *) _pc); _pc += 2;
+# define constant64(TYPE) * ((TYPE *) M3_INC(_pc,2))
#else
-# define constant64(TYPE) * ((TYPE *) _pc++);
+# define constant64(TYPE) * ((TYPE *) _pc++)
#endif
