trouble emilinating redundant compares

[Paul S]

Happy to oblige, when I believe I'm competent to advise others :-)

On 23/01/12 14:21, Hans-Peter Nilsson wrote:
> On Mon, 23 Jan 2012, Paul S wrote:
>    
>> Thanks Dave,
>>
>> I would never have guessed from gccinternals.pdf that it is possible to use
>> mode iterators to select predicates&  constraints ...
>>      
> Really?  If you but if you have suggestions for improving the
> documentation, that'd be welcome.
>
>    
>> 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
>>>
>>>
>>>
>>>
>>>
>>>        
>
>