[Bug target/91635] wrong code at -O2 with __builtin_add_overflow()

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91635

--- Comment #2 from Zdenek Sojka <zsojka at seznam dot cz> ---
(In reply to Jakub Jelinek from comment #1)
> Can't reproduce.
> I get:
> foo:
>         not     a4,a0
>         lui     a5,%hi(b)
>         slli    a0,a0,17
>         sh      a4,%lo(b)(a5)
>         srli    a0,a0,17
>         ret
> at -O2 which looks correct.

Thank you for checking this.
I can reproduce the failure with a "native" gcc-9.2.0-gentoo in a chroot.
I get the same result as you with -mabi=ilp32 ; perhaps you were compiling for
the 32bit target?

Please try adding -mabi=lp64d -march=rv64gc to the command line.