linux-kernel - Re: Support for TI FlashMedia (pci id 104c:8033, 104c:803b) flash card readers

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Date:	Fri, 28 Jul 2006 23:43:51 -0700 (PDT)
From:	Alex Dubov <oakad@...oo.com>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	linux-kernel@...r.kernel.org, pazke@...pac.ru
Subject: Re: Support for TI FlashMedia (pci id 104c:8033, 104c:803b) flash card readers

No optimization. I just thought both 0xffffffff and -1
are ugly.

--- Mikael Pettersson <mikpe@...uu.se> wrote:

> On Fri, 28 Jul 2006 06:02:11 -0700 (PDT), Alex Dubov
> wrote:
> >The exact condition is (irq_status!=0 &&
> >irq_status!=0xffffffff). I think it is not any
> better
> >that what I have.
> >
> >--- Andrey Panin <pazke@...pac.ru> wrote:
> >
> >> On 208, 07 27, 2006 at 08:34:06PM -0700, Alex
> Dubov
> >> wrote:
> >> 
> >> What this strange line (in tifm_7xx1_isr
> function)
> >> is supposed to do:
> >> 
> >>         if(irq_status && (~irq_status))
> 
> If you're chasing micro-optimisations, you could
> write
> 
>     /* if irq_status is not 0 or ~0, do <blah> */
>     if (((unsigned)irq_status + 1) >= 2)
> 
> which should reduce the number of conditional
> branches
> to a single one. (And drop the cast if irq_status is
> declared as unsigned.)
> 
> But for long-term maintenance just spelling out the
> exact
> condition (irq_status != 0 && irq_status != ~0) is
> preferable.
> 


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