Re: [PATCH bpf-next v3 0/3] bpf, mips: Add signed div/mod support

[Nicholas Dudar]

> Please proceed with the remaining opcodes in the meantime. I will do
> the same on my part as we discussed, and then we can wrap up this
> whole v4 compliance work when I am back.

Sorry to bother you while you're away, I hope the holiday is going well.
No rush on this, but one ordering dependency fell out of my testing.
MOVSX and SDIV/SMOD need to land before MEMSX, BSWAP, or JMP32_JA.

MEMSX, BSWAP, and JMP32_JA are currently unhandled, so any program
containing one causes the MIPS JIT to abandon compilation. Adding support
for one removes the fallback, so a mixed program can reach the existing
MOV or DIV/MOD paths before their off encodings are supported and be
miscompiled.

I plan to post MOVSX today. For MEMSX, I will base it after MOVSX and
SDIV/SMOD and call out the dependency in the commit message. This avoids
carrying a temporary fail-closed check. Does that ordering work for BSWAP
and JMP32_JA?

Thanks,
Nick