linux-kernel - Re: [PATCH 1/1] vsprintf: optimize decimal conversion (again)

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Message-ID: <CAMuHMdWK-0m9-LUc90e7e8pYsOsECkZ3gjBYVAP-A4p7p=Pyug@mail.gmail.com>
Date:	Mon, 26 Mar 2012 22:18:52 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	linux-kernel@...r.kernel.org, Douglas W Jones <jones@...uiowa.edu>,
	Michal Nazarewicz <mnazarewicz@...gle.com>
Subject: Re: [PATCH 1/1] vsprintf: optimize decimal conversion (again)

On Mon, Mar 26, 2012 at 22:13, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Mon, 26 Mar 2012 21:56:38 +0200
> Denys Vlasenko <vda.linux@...glemail.com> wrote:
>
>> >> +#if BITS_PER_LONG != 32 || (~(0ULL)>>1) != ((1ULL<<63)-1)
>> >
>> > What's this for?
>>
>> The second check should be just BITS_PER_LONG_LONG != 64,
>> but we don't have BITS_PER_LONG_LONG.
>
> So let's add BITS_PER_LONG_LONG rather than hacking around its absence!

I don't think Linux runs on anything with BITS_PER_LONG_LONG != 64...

BTW, what about CPUs with slow 32x32 multiplication and/or slow 64-bit
division?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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