Re: [PATCH net-next] x86: bpf_jit: small optimization in emit_bpf_tail_call()
From: Alexei Starovoitov <hidden>
Date: 2017-08-31 14:38:20
On Thu, Aug 31, 2017 at 04:53:42AM -0700, Eric Dumazet wrote:
From: Eric Dumazet <edumazet@google.com> Saves 4 bytes replacing following instructions : lea rax, [rsi + rdx * 8 + offsetof(...)] mov rax, qword ptr [rax] cmp rax, 0 by : mov rax, [rsi + rdx * 8 + offsetof(...)] test rax, rax Signed-off-by: Eric Dumazet <edumazet@google.com>
Nicely spotted. Much appreciate it! Acked-by: Alexei Starovoitov <ast@kernel.org>