lkml.org 
[lkml]   [2008]   [Mar]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Linux doesn't follow x86/x86-64 ABI wrt direction flag
    Hi,

    On Thu, 6 Mar 2008, Andi Kleen wrote:

    > To be realistic it is very unlikely anybody will measure a difference
    > from a few more or a few less clds in a program.

    Only an assumption, and in fact wrong. See upthread for a benchmark.
    IIRC Uros also made measurements to justify the removal of cld (on P4 I
    think), where it helps tremendously on small memcpy loops.


    Ciao,
    Michael.


    \
     
     \ /
      Last update: 2008-03-07 15:13    [W:3.887 / U:0.036 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site