From: Christopher Li <sparse@chrisli.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-sparse@vger.kernel.org
Subject: Re: [PATCH 1/2] Add new streams to a hash-list based on their names
Date: Tue, 19 Apr 2011 15:01:48 -0700 [thread overview]
Message-ID: <BANLkTim28ODvCB541rzmvXVgByF5h-ZAMQ@mail.gmail.com> (raw)
In-Reply-To: <alpine.LFD.2.02.1104191113010.22048@i5.linux-foundation.org>
On Tue, Apr 19, 2011 at 11:17 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> + while ((c = *name++) != 0)
> + hash = (hash + (c << 4) + (c >> 4)) * 11;
> +
> + hash *= HASH_PRIME;
> + hash >>= 32 - HASHED_INPUT_BITS;
Just curious about this hash function, obviously it is not the same as the one
used for hashing idents. Does it have any history or you just code it up?
Chris
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next prev parent reply other threads:[~2011-04-19 22:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-19 18:12 [PATCH 0/2] Fix 'already_tokenized()' performance problem Linus Torvalds
2011-04-19 18:17 ` [PATCH 1/2] Add new streams to a hash-list based on their names Linus Torvalds
2011-04-19 22:01 ` Christopher Li [this message]
2011-04-19 22:13 ` Linus Torvalds
2011-04-19 18:19 ` PATCH 2/2] Teach 'already_tokenized()' to use the stream name hash table Linus Torvalds
2011-04-19 21:52 ` [PATCH 0/2] Fix 'already_tokenized()' performance problem Christopher Li
2011-04-19 22:09 ` Linus Torvalds
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