Re: [PATCH v3 bpf-next] RV32G eBPF JIT

[Alexei Starovoitov]

On Wed, Feb 19, 2020 at 8:20 PM Luke Nelson <lukenels@xxxxxxxxxxxxxxxxx> wrote:
>
> This is an eBPF JIT for RV32G, adapted from the JIT for RV64G and
> the 32-bit ARM JIT.
...
> v2 -> v3:
>   * Added support for far jumps / branches similar to RV64 JIT.
>   * Added support for tail calls.
>   * Cleaned up code with more optimizations and comments.
>   * Removed special zero-extension instruction from BPF_ALU64
>     case, pointed out by Jiong Wang.
>
> v1 -> v2:
>   * Added support for far conditional branches.
>   * Added the zero-extension optimization pointed out by Jiong Wang.
>   * Added more optimizations for operations with an immediate operand.
>
> Cc: Jiong Wang <jiong.wang@xxxxxxxxxxxxx>
> Co-developed-by: Xi Wang <xi.wang@xxxxxxxxx>
> Signed-off-by: Xi Wang <xi.wang@xxxxxxxxx>
> Signed-off-by: Luke Nelson <lukenels@xxxxxxxxxxxxxxxxx>

Bjorn,

please review.