Re: Question about simple_return pattern for the GCC ARM backend.

2013-12-30 Thread Ramana Radhakrishnan 
On Mon, Dec 30, 2013 at 3:23 AM, Yangfei (Felix) felix.y...@huawei.com wrote:
 Thanks for the reply. I found it in GCC-4.8.
 The gcc version I look at is GCC-4.7. Seems this pattern is not there for 
 this version.

That will be because this was added in time for GCC 4.8. If you need
to find such information as to when something was added please look
into Changelog* files and / or look on the gcc-patches archive. In
this case you need to look for a patch that enables shrink wrapping
for ARM.

Also, checking whether certain features are present or not in the
source tree are best checked in the trunk sources since that is where
new development happens.

Thanks,
Ramana



 On 2013/12/28 09:31 AM, Yangfei (Felix) wrote:
  Hi,
 
I think that simple_return standard pattern is useful for the ARM. I mean
 it should be good for target code performance.
 　 But seems this pattern is not there for the GCC ARM backend. Can anyone
 explain the reason why we don’t need this?
 
  Cheers,
  Fei
 

 It does use it. Search for the return_strreturn expand pattern, and the
 returns code iterator in config/arm/iterators.md.

 Chung-Lin

Re: Question about simple_return pattern for the GCC ARM backend.

2013-12-29 Thread Yangfei (Felix) 
Thanks for the reply. I found it in GCC-4.8. 
The gcc version I look at is GCC-4.7. Seems this pattern is not there for this 
version.

 
 On 2013/12/28 09:31 AM, Yangfei (Felix) wrote:
  Hi,
 
I think that simple_return standard pattern is useful for the ARM. I mean
 it should be good for target code performance.
  　But seems this pattern is not there for the GCC ARM backend. Can anyone
 explain the reason why we don’t need this?
 
  Cheers,
  Fei
 
 
 It does use it. Search for the return_strreturn expand pattern, and the
 returns code iterator in config/arm/iterators.md.
 
 Chung-Lin

Re: Question about simple_return pattern for the GCC ARM backend.

2013-12-28 Thread Chung-Lin Tang 
On 2013/12/28 09:31 AM, Yangfei (Felix) wrote:
 Hi, 
 
   I think that simple_return standard pattern is useful for the ARM. I mean 
 it should be good for target code performance.
 　But seems this pattern is not there for the GCC ARM backend. Can anyone 
 explain the reason why we don’t need this?
 
 Cheers,
 Fei
 

It does use it. Search for the return_strreturn expand pattern, and
the returns code iterator in config/arm/iterators.md.

Chung-Lin

Question about simple_return pattern for the GCC ARM backend.

2013-12-27 Thread Yangfei (Felix) 
Hi, 

  I think that simple_return standard pattern is useful for the ARM. I mean it 
should be good for target code performance.
　But seems this pattern is not there for the GCC ARM backend. Can anyone 
explain the reason why we don’t need this?

Cheers,
Fei