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From: Song Liu <liu.song.a23@gmail.com>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>, bpf <bpf@vger.kernel.org>,
	Networking <netdev@vger.kernel.org>
Subject: Re: [PATCH bpf-next 2/2] bpf: Add loop test case with 32 bit reg comparison against 0
Date: Thu, 3 Oct 2019 13:56:53 -0700	[thread overview]
Message-ID: <CAPhsuW6oGoBK28JyY3r6a+fzesqa8c7Zki+z33XXV2AS6=JVwQ@mail.gmail.com> (raw)
In-Reply-To: <20191002234512.25902-2-daniel@iogearbox.net>

On Wed, Oct 2, 2019 at 5:30 PM Daniel Borkmann <daniel@iogearbox.net> wrote:
>
> Add a loop test with 32 bit register against 0 immediate:
>
>   # ./test_verifier 631
>   #631/p taken loop with back jump to 1st insn, 2 OK
>
> Disassembly:
>
>   [...]
>   1b:   test   %edi,%edi
>   1d:   jne    0x0000000000000014
>   [...]
>
> Pretty much similar to prior "taken loop with back jump to 1st
> insn" test case just as jmp32 variant.
>
> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

Acked-by: Song Liu <songliubraving@fb.com>

  reply	other threads:[~2019-10-03 20:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-02 23:45 [PATCH bpf-next 1/2] bpf, x86: Small optimization in comparing against imm0 Daniel Borkmann
2019-10-02 23:45 ` [PATCH bpf-next 2/2] bpf: Add loop test case with 32 bit reg comparison against 0 Daniel Borkmann
2019-10-03 20:56   ` Song Liu [this message]
2019-10-03 20:52 ` [PATCH bpf-next 1/2] bpf, x86: Small optimization in comparing against imm0 Song Liu
2019-10-03 21:08   ` John Fastabend
2019-10-04 19:36     ` Alexei Starovoitov

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