[patch] tuning gcc for Intel Core2

[Vladimir Makarov]

H. J. Lu wrote:

>On Tue, Nov 14, 2006 at 07:49:56AM -0800, H. J. Lu wrote:
>  
>
>>Can you turn on x86_rep_movl_optimal for -mtune=generic to see what
>>it does for SPEC CPU 2K on both 32bit and 64bit?
>>
>>    
>>
>
>
>So for 64bit, -O2 + x86_rep_movl_optimal is better than -O2 and
>-O2 -mtune=core2 on Core 2 Duo and Nocona. I suspect that we will
>see similar trend on Opteron.
>
>  
>
I've got about the same numbers for generic + x86_rep_movl_optimal. 
 Although with -m32 generic + x86_rep_movl_optimal is a bit worse than 
-mtune=core2 (1836 vs 1841 for SPECINT and 1477 vs 1484 for SPECFP).  It 
is in the range of measurement error.  But again code size is smaller 
(0.73% and 0.66% correspondingly for SPECInt and SPECFp).

Vlad