From: Denis Zaitsev <zzz@anda.ru>
To: Zack Weinberg <zack@codesourcery.com>,
Daniel Jacobowitz <drow@mvista.com>,
Ulrich Drepper <drepper@redhat.com>,
Richard Henderson <rth@redhat.com>, Andreas Jaeger <aj@suse.de>,
libc-alpha@sources.redhat.com, linux-gcc@vger.kernel.org,
gcc@gcc.gnu.org
Subject: Re: i386 inline-asm string functions - some questions
Date: Tue, 30 Dec 2003 00:37:20 +0500 [thread overview]
Message-ID: <20031230003720.I6728@zzz.ward.six> (raw)
In-Reply-To: <20031230003147.H6728@zzz.ward.six>; from zzz@anda.ru on Tue, Dec 30, 2003 at 12:31:47AM +0500
On Tue, Dec 30, 2003 at 12:31:47AM +0500, Denis Zaitsev wrote:
> On Mon, Dec 29, 2003 at 11:09:14AM -0800, Zack Weinberg wrote:
> > Same if the out-of-line memcpy takes several more instructions to
> > set up but makes damn sure to do aligned memory accesses
> > (full-bus-width loads, nontemporal store, prefetches, etc etc etc),
> > whereas the inline one doesn't.
Sorry, I mean the inline functions below! Of course!
> First, they are trying to do so here and there (but ok, not fine).
>
> Second, I have experimented with this nonaligned access some time
> ago. I don't remember exactly, but it seems that the modern x86
> processors do the job as fine as when the memory access is aligned.
> But as it was too far ago, I can't recollect the details and so I
> won't insist. Better I will repeat the measurements...
next prev parent reply other threads:[~2003-12-29 19:37 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-25 0:20 i386 inline-asm string functions - some questions Denis Zaitsev
2003-12-25 0:38 ` Richard Henderson
2003-12-25 1:15 ` Denis Zaitsev
2003-12-25 1:21 ` Zack Weinberg
2003-12-25 1:45 ` Denis Zaitsev
2003-12-26 3:40 ` Zack Weinberg
2003-12-27 4:58 ` Richard Henderson
2003-12-27 10:24 ` Zack Weinberg
2003-12-27 11:35 ` Denis Zaitsev
2003-12-27 18:38 ` Zack Weinberg
2003-12-28 20:58 ` Denis Zaitsev
2003-12-29 2:22 ` Zack Weinberg
2003-12-29 2:44 ` Denis Zaitsev
2003-12-29 2:46 ` Zack Weinberg
2003-12-29 2:53 ` Denis Zaitsev
2003-12-29 3:35 ` Ulrich Drepper
2003-12-29 3:54 ` Andrew Pinski
2003-12-29 6:57 ` Jakub Jelinek
2003-12-29 3:56 ` Zack Weinberg
2003-12-29 5:31 ` Daniel Jacobowitz
2003-12-29 5:55 ` Zack Weinberg
2003-12-29 18:37 ` Denis Zaitsev
2003-12-29 19:09 ` Zack Weinberg
2003-12-29 19:31 ` Denis Zaitsev
2003-12-29 19:37 ` Denis Zaitsev [this message]
2003-12-29 18:51 ` Denis Zaitsev
2003-12-29 19:15 ` Zack Weinberg
2003-12-27 10:52 ` Denis Zaitsev
[not found] ` <20031225060850.C7419@zzz.ward.six>
[not found] ` <20031225012711.GD13447@redhat.com>
2003-12-25 1:38 ` Denis Zaitsev
2003-12-25 1:53 ` Richard Henderson
2003-12-25 2:08 ` Denis Zaitsev
2003-12-25 0:39 ` Roland McGrath
2003-12-25 1:13 ` Denis Zaitsev
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