From: Peter Chubb <peter@chubb.wattle.id.au>
To: linux-ia64@vger.kernel.org
Subject: Unaligned access question
Date: Thu, 25 Sep 2003 02:04:55 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106445553030155@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-106445366428887@msgid-missing>
>>>>> "Ian" = Ian Wienand <ianw@gelato.unsw.edu.au> writes:
Ian> Hi,
Ian> This isn't directly related to kernel development, but I am a bit
Ian> stumped as to why my test program below causes an unaligned
Ian> access when 'i' is 7 (that is, when it tries to access across a
Ian> 64 bit boundary of 'array'). It's counter intuitive to me, I
Ian> would have expected it either fault on all loads (for every value
Ian> of 'i') or to have not faulted at all.
The IA64 can handle unaligned acceses itself if they're within a small
window -- eight bytes for Itanium-2, can't remember for Itanium-I --
and if PSR.ac is 0.
--
Dr Peter Chubb http://www.gelato.unsw.edu.au peterc AT gelato.unsw.edu.au
You are lost in a maze of BitKeeper repositories, all slightly different.
next prev parent reply other threads:[~2003-09-25 2:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-25 1:34 Unaligned access question Ian Wienand
2003-09-25 2:04 ` Peter Chubb [this message]
2003-09-25 2:23 ` Martin Pool
2003-09-25 8:32 ` Andreas Schwab
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