> C cannot read the overflow bit after an ADD ... The compiler should offer a macro for that. If you use GCC then __builtin_add_overflow() is what you are look

> C cannot read the overflow bit after an ADD ... The compiler should offer a macro for that. If you use GCC then __builtin_add_overflow() is what you are looking for: "The compiler will attempt to use hardware instructions to implement these built-in functions where possible, like conditional jump on overflow after addition, conditional jump on carry etc." https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins...