[Bug c++/45462] Bad optimization in -O3 sometimes

["pinskia at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from pinskia at gmail dot com  2010-09-01 04:41 -------
Subject: Re:  Bad optimization in -O3 sometimes



On Aug 31, 2010, at 9:32 PM, "yotambarnoy at gmail dot com"
<gcc-bugzilla@gcc.gnu.org 
 > wrote:

>
>
> ------- Comment #6 from yotambarnoy at gmail dot com  2010-09-01  
> 04:32 -------
> I recently implemented a custom memcpy for ScummVM. I didn't notice  
> the
> standard memcpy using lwl and lwr. In any case, how would memcpy do  
> it any
> better? Unless you're referring to the new memcpy inlining in newer  
> versions of
> gcc?

I am referring to the standard builtin version of memcpy.  It is not  
just in newer versions; it has been there since 3.0. What is new is  
the more optimized version for x86 with either a large constant or a  
non constant. Can you try memcpy? If that does not work, please file a  
bug and cc me, I will see what I can do. I am working with MIPS lately.

>
>
> -- 
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45462
>


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45462