From: Yaro Pollak <yarop@altair-semi.com>
To: Matthew Jones <matthewjones@vw1600e.org.uk>
Cc: gcc-help@gcc.gnu.org
Subject: Re: Unaligned access to packed structs on ppc405
Date: Mon, 30 Jan 2006 16:26:00 -0000 [thread overview]
Message-ID: <43DE3E4C.5040803@altair-semi.com> (raw)
In-Reply-To: <20060130161852.1qy3zcccg040ss84@webmail.vw1600e.org.uk>
Matthew Jones wrote:
>>From: Yaro Pollak
>>
>>Greetings,
>>I am cross-compiling on GCC 3.4.1 for the PowerPC 405,
>>which can handle unaligned accesses in hardware.
>>Whenever I am accessing members of a packed bit-struct by
>>pointer, the compiler produces byte accesses, instead of
>>4-byte acceses. I've tried to use |-mstrict-align but to
>>no avail. Am I doing something wrong?
>>
>>
>
>Are you sure it is the compiler? Are you looking at the generated
>assembler, or inferring this from a logic analyser? If its the
>second case, it could be the uP rather than gcc.
>
>
>
I'm sorry I failed to mention that as well, but I am in fact looking at
the generated assembler, vs. the assembler generated when I am accessing
the members of the struct directly (not through a pointer).
Yaro
next prev parent reply other threads:[~2006-01-30 16:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-30 16:18 Matthew Jones
2006-01-30 16:26 ` Yaro Pollak [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-02-05 18:35 John Yates
2006-02-05 21:02 ` David Edelsohn
2006-02-06 10:18 ` Yaro Pollak
2006-02-01 12:03 [Re: Unaligned access to packed structs on ppc405] Yaro Pollak
2006-02-04 4:25 ` Unaligned access to packed structs on ppc405 David Edelsohn
2006-01-29 17:16 David Edelsohn
2006-01-30 12:03 ` Yaro Pollak
2006-02-02 16:13 ` David Edelsohn
2006-01-29 10:00 Yaro Pollak
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