From: Arthur Shipkowski <art@videon-central.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] struct NS16550 {...} __attribute__ ((packed)) at ns16550.h
Date: Mon, 25 Apr 2005 10:06:20 -0400 [thread overview]
Message-ID: <001501c5499f$f5364750$1780a8c0@art> (raw)
In-Reply-To: <20050425082008.C40EEC1510@atlas.denx.de>
> If this is really true, then there is either bug in GCC or in the code.
> If I code a 32 bit access the compiler must not use any other accesses.
If you use __attribute__ ((packed)), you are telling the compiler you have
an unaligned data structure (e.g. longs not by-4 aligned). Therefore, GCC
will always reassemble the 32-bit value from byte accesses.
Art Shipkowski
Videon Central Software Engineer
(814)235-1111 x307
art at videon-central.com
next prev parent reply other threads:[~2005-04-25 14:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-22 14:57 [U-Boot-Users] struct NS16550 {...} __attribute__ ((packed)) at ns16550.h Woojung.Huh at smsc.com
2005-04-22 18:39 ` Wolfgang Denk
2005-04-25 7:44 ` Jean-Paul Saman
2005-04-25 8:20 ` Wolfgang Denk
2005-04-25 14:06 ` Arthur Shipkowski [this message]
2005-04-25 14:56 ` Wolfgang Denk
2005-04-25 15:18 ` Pantelis Antoniou
2005-04-25 19:43 ` Wolfgang Denk
2005-04-25 20:15 ` Arthur Shipkowski
2005-04-25 20:59 ` Wolfgang Denk
2005-04-26 6:23 ` Pantelis Antoniou
2005-04-26 7:21 ` Wolfgang Denk
2005-04-26 14:32 ` Cory Tusar
-- strict thread matches above, loose matches on Subject: below --
2005-04-22 18:55 Woojung.Huh at smsc.com
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