<?xml version="1.0" encoding="UTF-8" ?>

<bugzilla version="5.2"
          urlbase="https://bugzilla.altlinux.org/"
          
          maintainer="jenya@basealt.ru"
>

    <bug>
          <bug_id>23871</bug_id>
          
          <creation_ts>2010-08-10 18:30:22 +0400</creation_ts>
          <short_desc>[FR] march=i486 by default for i586 repo</short_desc>
          <delta_ts>2012-12-22 19:41:45 +0400</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>4</classification_id>
          <classification>Development</classification>
          <product>Sisyphus</product>
          <component>rpm-build</component>
          <version>unstable</version>
          <rep_platform>x86</rep_platform>
          <op_sys>Linux</op_sys>
          <bug_status>NEW</bug_status>
          <resolution></resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P3</priority>
          <bug_severity>enhancement</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Michael Shigorin">mike</reporter>
          <assigned_to name="placeholder@altlinux.org">placeholder</assigned_to>
          <cc>arseny</cc>
    
    <cc>evg</cc>
    
    <cc>glebfm</cc>
    
    <cc>imz</cc>
    
    <cc>ldv</cc>
    
    <cc>n3npq</cc>
    
    <cc>placeholder</cc>
    
    <cc>vsu</cc>
    
    <cc>vt</cc>
          
          <qa_contact>qa-sisyphus</qa_contact>

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>111110</commentid>
    <comment_count>0</comment_count>
    <who name="Michael Shigorin">mike</who>
    <bug_when>2010-08-10 18:30:22 +0400</bug_when>
    <thetext>glibc authors recommend to avoid using i586-specific optimization for i686+ since these processors are quite different in architecture from pure i586 -- e.g. three pipelines instead of two perform better with one command stream instead of two:

http://git.altlinux.org/people/ldv/packages/?p=glibc.git;a=blob;f=sysdeps/i386/i686/Implies

Is it reasonable to &quot;downgrade&quot; optimization aiming at higher performance of legacy/lightweight systems?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>128046</commentid>
    <comment_count>1</comment_count>
    <who name="Jeff Johnson">n3npq</who>
    <bug_when>2012-01-03 02:45:23 +0400</bug_when>
    <thetext>tracked at https://bugs.launchpad.net/rpm/+bug/911012</thetext>
  </long_desc>
      
      

    </bug>

</bugzilla>