lkml.org 
[lkml]   [2000]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] isa_{read,write}{w,l} fixed
On Sat, Feb 12, 2000 at 12:14:40PM +0100, Philipp Rumpf wrote:
> > Philipp's point is still valid though, u32 is only 2 byte aligned on
>
> Alan's point. My point was you could rely on gcc not padding structures
> when you always explicitly padded to natural alignment boundaries. Eg
> when you do struct { u16 s; u32 l; } you deserve to get burned, but when
> you do struct { u16 s; u16 unused; u32 l; } you can expect gcc not to
> be smart on you.

Alas, you can't. If accessing quantities of type short is exceptionally
slow, then it may well be that the ABI decress Thou Shalt Pad. gcc has
__attribute__(packed) to allow you to work around this.

Just do as the plan9'ers do and represent all externally visible data
as an array of unsigned chars. It's difficult to get that wrong.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:56    [W:2.284 / U:0.784 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site