From: David Miller <davem@davemloft.net>
To: bharrosh@panasas.com
Cc: npiggin@gmail.com, hooanon05@yahoo.co.jp, npiggin@kernel.dk,
torvalds@linux-foundation.org, linux-arch@vger.kernel.org,
x86@kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: Big git diff speedup by avoiding x86 "fast string" memcmp
Date: Thu, 16 Dec 2010 09:57:16 -0800 (PST) [thread overview]
Message-ID: <20101216.095716.71123831.davem@davemloft.net> (raw)
In-Reply-To: <4D09E185.2040600@panasas.com>
From: Boaz Harrosh <bharrosh@panasas.com>
Date: Thu, 16 Dec 2010 11:53:09 +0200
> You miss understood me. I'm saying that we know the beggining of the
> string is aligned and Nick offered to pad the last long, so surly
> a shift by 2 (or 3) + the reduction of the 12 dec-and-test to 3
> should give you an optimization?
Indeed, we could do something interesting in the case where both
strings are tail padded like that.
next prev parent reply other threads:[~2010-12-16 17:57 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-09 7:09 Big git diff speedup by avoiding x86 "fast string" memcmp Nick Piggin
2010-12-09 13:37 ` Borislav Petkov
2010-12-10 2:38 ` Nick Piggin
2010-12-10 4:27 ` Nick Piggin
2010-12-10 14:23 ` J. R. Okajima
2010-12-13 1:45 ` Nick Piggin
2010-12-13 7:29 ` J. R. Okajima
2010-12-13 8:25 ` Nick Piggin
2010-12-14 19:01 ` J. R. Okajima
2010-12-15 4:06 ` Nick Piggin
2010-12-15 5:57 ` J. R. Okajima
2010-12-15 13:15 ` Boaz Harrosh
2010-12-15 18:00 ` David Miller
2010-12-16 9:53 ` Boaz Harrosh
2010-12-16 13:13 ` Nick Piggin
2010-12-16 14:03 ` Boaz Harrosh
2010-12-16 14:15 ` Nick Piggin
2010-12-16 16:51 ` Linus Torvalds
2010-12-16 17:57 ` David Miller [this message]
2010-12-15 4:38 ` Américo Wang
2010-12-15 5:54 ` Nick Piggin
2010-12-15 7:12 ` Linus Torvalds
2010-12-15 23:09 ` Tony Luck
2010-12-16 2:34 ` Nick Piggin
-- strict thread matches above, loose matches on Subject: below --
2010-12-18 22:54 George Spelvin
2010-12-19 14:28 ` Boaz Harrosh
2010-12-19 15:46 ` Nick Piggin
2010-12-19 17:06 ` George Spelvin
2010-12-21 9:26 ` Nick Piggin
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