[PATCH] Set fast unaligned load flag for new Intel microarchitecture.

[Andreas Jaeger]

On 06/14/2013 12:35 PM, Dmitrieva Liubov wrote:
> I have small patch for new Intel Silvermont machines.
>
> http://newsroom.intel.com/community/intel_newsroom/blog/2013/05/06/intel-launches-low-power-high-performance-silvermont-microarchitecture
>
> Ok for 2.18?
>
> I checked this on my machine and see that strcpy, ... unaligned
> versions are faster than ssse3 versions.
>
> ChangeLog:
>
>   2013-06-14  Liubov Dmitrieva  <liubov.dmitrieva@intel.com>
>
>          * .sysdeps/x86_64/multiarch/init-arch.c: Set
> bit_Fast_Unaligned_Load for new
>         Intel Silvermont architecture.

This needs proper formatting, please check before committing - and name 
the function you change like:
	* sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features):

>
> diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/ini
> index 7daaf46..23b1b98 100644
> --- a/sysdeps/x86_64/multiarch/init-arch.c
> +++ b/sysdeps/x86_64/multiarch/init-arch.c
> @@ -77,7 +77,11 @@ __init_cpu_features (void)
>                /* BSF is slow on Atom.  */
>                __cpu_features.feature[index_Slow_BSF] |= bit_Slow_BSF;
>                break;
> -
> +           case 0x37:
> +             /* Silvermont.  */

Say in the comment that unaligned versions are faster than SSSE3.

Otherwise fine,
Andreas

> +             __cpu_features.feature[index_Fast_Unaligned_Load]
> +                               |= bit_Fast_Unaligned_Load;
> +             break;
>              default:
>                /* Unknown family 0x06 processors.  Assuming this is one
>                   of Core i3/i5/i7 processors if AVX is available.  */
>
>
>
> --
> Liubov Dmitrieva
> Intel Corporation
>


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