[csw-maintainers] Compiler optimization Sun Studio vs. GCC

[Dagobert Michelsen]

Hi Peter,

I'm adding James to the post as he has experience in
compiler optimization and used it for some of his packages
extensively.

Am 13.05.2009 um 15:04 schrieb Peter FELECAN:

> Dagobert Michelsen <dam at opencsw.org> writes:
>
>>>> You have to install it :-) Apart from that the code generation for
>>>> Sparc of gcc is very bad, that's why I also installed gccfss if
>>>> the project absolutely demands gcc, but this further compilcates
>>>> compilation.
>>>
>>> Having to install it is not an issue IMHO.
>>>
>>> When you say "very bad" what do you mean?
>>
>> The optimized is inferior to the one of SOS. I remember reading a
>> comparison of the two, but I can't find it at
>> <http://cooltools.sunsource.net/gcc/>
>>
>
> Didn't find it either. Well, my question was motivated to really  
> qualify
> the differences, lets say on a scale of 1 to 100, how do we position  
> the
> 2 compilers for SPARC generated code. Saying "very bad" is relative  
> but
> to what and in what measure?
>
> Finally, is that so important for the kind of packages that we  
> provide?
> For 1%, 10% or 66%...

Maybe James or some other maintainer has real, first-hand performance  
data?


Best regards

  -- Dago