Re: [PATCH net-next] x86: bpf_jit: small optimization in emit_bpf_tail_call()

On Thu, Aug 31, 2017 at 04:53:42AM -0700, Eric Dumazet wrote:

From: Eric Dumazet <redacted>

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 <redacted>

Nicely spotted. Much appreciate it!
Acked-by: Alexei Starovoitov <ast@kernel.org>