Re: trouble emilinating redundant compares

[Paul S <pauls at dataworx dot com dot au>]

Thanks Dave,

I would never have guessed from gccinternals.pdf that it is possible to 
use mode iterators to select predicates & constraints ... I think I have 
a use for this today :-)

Cheers, Paul.

On 20/01/12 10:26, Dave Korn wrote:
> On 17/01/2012 21:16, Paul S wrote:
>
>    
> > For example the i386 seems to use predicates and constraints of the form
> > <*_operand>  and<m/r/i>  for the reload versions of these instructions -
> > and I haven't been able to find definitions of these or a mention in
> > gcc_internals.pdf of any special meaning assigned to the<>  notation.
> >      
>    See http://gcc.gnu.org/onlinedocs/gccint/Substitutions.html, and take a look
> for the define_[code/mode]_[attr/iterator] definitions around line ~650ish of
> i386.md
>
>      cheers,
>        DaveK
>
>
>
>
>