linux-kernel - Re: [patch 1/2] Enable link power management for ata drivers

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Date:	Tue, 25 Sep 2007 02:00:22 +0200
From:	roel <12o3l@...cali.nl>
To:	Davide Libenzi <davidel@...ilserver.org>
CC:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	axboe@...nel.dk, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 1/2] Enable link power management for ata drivers

Davide Libenzi wrote:
> On Tue, 25 Sep 2007, roel wrote:
> 
>>> +	if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
>> 	if (!((ap->flags & ATA_FLAG_IPM) && ata_dev_enabled(dev))) {
> 
> int foo(int i, int j) {
>         
>         return !(i & 8) || !j;
> }
> 
> int moo(int i, int j) {
>         
>         return !((i & 8) && j);
> }
> 
> 
> gcc -O2 -S:
> 
> 
> .globl foo
>         .type   foo, @function
> foo:
>         shrl    $3, %edi
>         xorl    $1, %edi
>         testl   %esi, %esi
>         sete    %al
>         orl     %eax, %edi
>         andl    $1, %edi
>         movl    %edi, %eax
>         ret
> .globl moo
>         .type   moo, @function
> moo:
>         shrl    $3, %edi
>         xorl    $1, %edi
>         testl   %esi, %esi
>         sete    %al
>         orl     %eax, %edi
>         andl    $1, %edi
>         movl    %edi, %eax
>         ret

Indeed, no difference, except for the eye. 

do you not consider it an improvement or do you not want to change it?
or
don't you consider it an improvement and want to change it?

Never mind. Disregard if you please.

> - Davide

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