4 ms·

You may be interested in http://blog.regehr.org/archives/1139 http://blog.regehr.org/archives/1139 by the same author, and also the (GNU) compiler built-ins for

by dbaupp 11y ago

You may be interested in http://blog.regehr.org/archives/1139 http://blog.regehr.org/archives/1139 by the same author, and also the (GNU) compiler built-ins for exactly that task https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins... . (Note that your second example can't work in C/C++, since the check happens after the operation.)

daurnimator 11y ago
> (Note that your second example can't work in C/C++, since the check happens after the operation.) I think the poster already knew that, hence the `magic`.