linux-kernel - Re: X32 psABI status update

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Date:	Mon, 21 Mar 2011 09:20:38 +0100 (CET)
From:	Michael Matz <matz@...e.de>
To:	"H.J. Lu" <hjl.tools@...il.com>
Cc:	Mike Frysinger <vapier@...too.org>, libc-alpha@...rceware.org,
	GCC Development <gcc@....gnu.org>,
	LKML <linux-kernel@...r.kernel.org>, x32-abi@...glegroups.com
Subject: Re: X32 psABI status update

Hi,

On Sun, 20 Mar 2011, H.J. Lu wrote:

> I don't think it will help x32 and I think it will make it harder to add 
> x32 support. I still want to see a real usage before I add it.

% cat real-world.c
/* intptr_t; what's that? */
union space_saving_htab_element {
  void *generic_pointer;
  /* Usually we need a long for a pointer, but I just figured out
     that on x32 an int is enough and smaller.  My program
     now needs half as much memory, supi!  */
#ifdef __x32__
  unsigned int as_number;
#else
  unsigned long as_number;
#endif
};


Ciao,
Michael.
PS: Of course you and I wouldn't write such code, but Mikes point was that
there might be some that do.  I could probably construct an example where 
it would matter for real involving inline asm that for some reason has to 
slightly differ depending on x32-ness.
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