linux-kernel - Re: X32 psABI status

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Message-ID: <Pine.LNX.4.64.1102131729120.16193@digraph.polyomino.org.uk>
Date:	Sun, 13 Feb 2011 17:37:50 +0000 (UTC)
From:	"Joseph S. Myers" <joseph@...esourcery.com>
To:	Petr Baudis <pasky@...e.cz>
cc:	"H.J. Lu" <hjl.tools@...il.com>, Florian Weimer <fw@...eb.enyo.de>,
	x32-abi@...glegroups.com, GCC Development <gcc@....gnu.org>,
	GNU C Library <libc-alpha@...rceware.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: X32 psABI status

On Sun, 13 Feb 2011, Petr Baudis wrote:

> I think it would be great if you could add some text like this plus some
> rationale (AIUI, this is geared mainly at new Atoms and other x86_64
> embedded platforms) to the document.
> 
> (BTW, it is not really convincing to me that such a niche is worth all
> the trouble this is going to bring.)

It seems to me there's a much more general utility for this.  After all, 
the normal practice on 64-bit Power Architecture GNU/Linux systems, say, 
is for most programs to be 32-bit and only a few that have a use for a 
large address space to be 64-bit.  For most programs, large pointers and 
size_t are just a waste of memory (and so of cache) - but the extra 
registers are significantly beneficial (as are such things as being able 
to assume SSE to be supported).  (Large files, 64-bit time_t, etc., 
however, are of wider use than large address space, but as I noted in 
<http://gcc.gnu.org/ml/gcc/2010-12/msg00509.html> it would be a fairly 
substantial project to address all such issues of inappropriate arbitrary 
limits in C APIs.)

-- 
Joseph S. Myers
joseph@...esourcery.com
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