Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote: [...] > > Although the Linux verifier doesn't support them, the fact that gcc > > does support them tells me that it's probably safest to list the DW > > and LDX variants as deprecated as well, which is what the draft > > already did in the appendix so that's good (nothing to change there, I > > think). > > DW never existed in classic bpf, so abs/ind never had DW flavor. > If some assembler/compiler decided to "support" them it's on them. > The standard must not list such things as deprecated. They never existed. So > nothing is deprecated. Ack, I will remove the ABS/IND + DW lines from the appendix. > Same with MSH. BPF_LDX | BPF_MSH | BPF_B is the only insn ever existed. > It's a legacy insn. Just like abs/ind. Should it be listed in the legacy conformance group then? Currently it's not mentioned in instruction-set.rst at all, so the opcode is available to use by any new instruction. If we do list it in instruction-set.rst then, like abs/ind, it will be avoided by anyone proposing new instructions. Dave
