From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] x86: bpf_jit_comp: Reduce is_ereg() code size
Date: Tue, 09 Dec 2014 14:57:12 -0500 (EST)
Message-ID: <20141209.145712.712673313891632719.davem@davemloft.net>
References: <CAADnVQKtYkKtsd9rUFm2yfMoh7F_SRFPVP8hpvSY00KpmB-NNg@mail.gmail.com>
	<1417734048.2721.22.camel@perches.com>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: alexei.starovoitov@gmail.com, lambert.quentin@gmail.com,
	kuznet@ms2.inr.ac.ru, jmorris@namei.org, yoshfuji@linux-ipv6.org,
	kaber@trash.net, tglx@linutronix.de, mingo@redhat.com,
	hpa@zytor.com, x86@kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
To: joe@perches.com
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <1417734048.2721.22.camel@perches.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

From: Joe Perches <joe@perches.com>
Date: Thu, 04 Dec 2014 15:00:48 -0800

> Use the (1 << reg) & mask trick to reduce code size.
> 
> x86-64 size difference -O2 without profiling for various
> gcc versions:
> 
> $ size arch/x86/net/bpf_jit_comp.o*
>    text    data     bss     dec     hex filename
>    9266       4       0    9270    2436 arch/x86/net/bpf_jit_comp.o.4.4.new
>   10042       4       0   10046    273e arch/x86/net/bpf_jit_comp.o.4.4.old
>    9109       4       0    9113    2399 arch/x86/net/bpf_jit_comp.o.4.6.new
>    9717       4       0    9721    25f9 arch/x86/net/bpf_jit_comp.o.4.6.old
>    8789       4       0    8793    2259 arch/x86/net/bpf_jit_comp.o.4.7.new
>   10245       4       0   10249    2809 arch/x86/net/bpf_jit_comp.o.4.7.old
>    9671       4       0    9675    25cb arch/x86/net/bpf_jit_comp.o.4.9.new
>   10679       4       0   10683    29bb arch/x86/net/bpf_jit_comp.o.4.9.old
> 
> Signed-off-by: Joe Perches <joe@perches.com>

Applied.