lkml.org 
[lkml]   [2011]   [Dec]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: x86 memcpy performance
> Will AVX work on Intel ATOM. I guess not. Then is this now not the
> time for having architecture dependant definitions for basic cpu
> intensive tasks

It's pretty much a necessity if you want to fine tune some of this.

> > If you want to speed up memcpy, I think your best bet is to find out why it's
> > so much slower when src and dst aren't 64-byte aligned compared to each other.

rep mov on most x86 processors is an extremely optimised path. The 64
byte alignment behaviour is to be expected given the processor cache line
size.

Alan


\
 
 \ /
  Last update: 2011-12-05 15:37    [W:0.061 / U:9.192 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site