This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]

Re: Feature request: ability to describe x86 register halves as contraints.


On Wed, Jul 01, 1998 at 02:44:02AM +0200, Alan Modra wrote:
> 
> On Tue, 30 Jun 1998 ak@muc.de wrote:
> 
> > > 	asm ("# %0 %b0 %h0 %w0 %k0" : : "q"(x));
> > > 
> > > yields
> > > 
> > > 	# %eax %al %ah %ax %eax
> > 
> > Ok, I feel stupid now, but to my defense I must say that this is not 
> > documented in the info pages.
> 
> Yes, you have to dig into i386.md
> 
> Colin Plumb <colin@nyx.net> wrote a really good, tutorial style,
> description of x86 constraints.  If you ask him, I guess he'd be happy to
> send it to you.  His tutorial really ought to be part of egcs
> documentation.

I have his tutorial, but I didn't look there (mea culpa)


-Andi


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]