GCC since 5.0 and Clang since longer ago than that support (the same) set of builtin functions to check carry and overflow bits: https://gcc.gnu.org/onlinedocs

GCC since 5.0 and Clang since longer ago than that support (the same) set of builtin functions to check carry and overflow bits: https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins... http://clang.llvm.org/docs/LanguageExtensions.html#checked-arithmetic-builtins http://clang.llvm.org/docs/LanguageExtensions.html#checked-a...