[Bug middle-end/108016] RISC-V：Bad codegen in scalar code comparing to LLVM

[juzhe.zhong at rivai dot ai]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108016

--- Comment #2 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
#include <algorithm>
        std::pair<unsigned, bool> full_add(unsigned a, unsigned b)
        { return std::make_pair(a + b, a + b < a); }