> On Fri, Jul 28, 2023 at 9:41 AM Jose E. Marchesi > <jose.marchesi@xxxxxxxxxx> wrote: >> >> >> Hello. >> >> Just a heads up regarding the new BPF V4 instructions and their support >> in the GNU Toolchain. > > Awesome. Thanks for the update! > >> V4 sdiv/smod instructions >> >> Binutils has been updated to use the V4 encoding of these >> instructions, which used to be part of the xbpf testing dialect used >> in GCC. GCC generates these instructions for signed division when >> -mcpu=v4 or higher. > > With sdiv/smod implemented do you still have a need for xbpf flag? > Anything still missing or you can start using -mcpu=v4 in gcc selftests > and remove xbpf completely? Just `call %r' (what the clang disassembler calls callx.) >> So I think we are done with this. Please let us know if these >> instructions ever change. > > Fingers crossed, they will never change. > How far are we from running bpf selftests with gcc? We are getting there, but not quite yet. See https://gcc.gnu.org/wiki/BPFBackEnd where we track our work. (The CO-RE builtins entry is basically done, but we are still polishing the details before sending the patch to GCC upstream.)
