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From: Joel Soete <soete.joel@tiscali.be>
To: Randolph Chung <randolph@tausq.org>
Cc: parisc-linux@lists.parisc-linux.org
Subject: [parisc-linux] pa_memcpy: 2 small question
Date: Sun, 09 Jan 2005 19:07:27 +0000	[thread overview]
Message-ID: <41E180EF.8040808@tiscali.be> (raw)
In-Reply-To: <20050107095143.GN18497@tausq.org>

Hello Randolph,

I just studying your pa_memcpy code (always to see if I can use it to improve stuff that you suggested me: l*).
And I wonder understand some values in copy_dstalign():
[...]
in the shift computing:
         /* Calculate how to shift a word read at the memory operation
            aligned srcp to make it aligned for copy.  */
         sh_1 = 8 * (src % sizeof(unsigned int));
         sh_2 = 8 * sizeof(unsigned int) - sh_1;

what means '8' (== 2 * word size; i.e. 2 * 32 bit because MERGE use shrpw and so 2 (a pair of word)? )

next in
          switch (len % 4)
         {

is '4' because as mentioned in copy_dstalign() description this 'Handles _4_ words per loop'

Thanks in advance,
	Joel
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  parent reply	other threads:[~2005-01-09 19:07 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20050105055412.68E06495698@palinux.hppa>
2005-01-05  6:16 ` [parisc-linux] more cpup.c results Grant Grundler
2005-01-05  8:20   ` Joel Soete
2005-01-05  8:40   ` Ryan Bradetich
2005-01-05 16:02     ` Grant Grundler
     [not found] ` <20050107095143.GN18497@tausq.org>
2005-01-09 19:07   ` Joel Soete [this message]
2005-01-10  0:13     ` [parisc-linux] Re: pa_memcpy: 2 small question Randolph Chung
2005-01-10  8:44       ` Joel Soete
2005-01-10  8:54         ` Randolph Chung
2005-01-10 17:12           ` Joel Soete
2005-01-10 17:17             ` Grant Grundler
2005-01-10 20:02             ` Stuart Brady
2005-01-11 18:14           ` Joel Soete
2005-01-12  1:49             ` Randolph Chung
2005-02-20 23:44   ` [parisc-linux] revisit copy_user_page_asm microbenchmarks Grant Grundler

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