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RE: Unaligned access to packed structs on ppc405
- From: Matthew Jones <matthewjones at vw1600e dot org dot uk>
- To: gcc-help at gcc dot gnu dot org
- Date: Mon, 30 Jan 2006 16:18:52 +0000
- Subject: RE: Unaligned access to packed structs on ppc405
> 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.
--
Matthew JONES
http://www.tandbergtv.com/