Bug 23871 - [FR] march=i486 by default for i586 repo
: [FR] march=i486 by default for i586 repo
Status: NEW
: Sisyphus
(All bugs in Sisyphus/rpm-build)
: unstable
: x86 Linux
: P3 enhancement
Assigned To:
:
:
:
:
:
  Show dependency tree
 
Reported: 2010-08-10 18:30 by
Modified: 2012-12-22 19:41 (History)


Attachments


Note

You need to log in before you can comment on or make changes to this bug.


Description From 2010-08-10 18:30:22
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 "downgrade" optimization aiming at higher performance of
legacy/lightweight systems?
------- Comment #1 From 2012-01-03 02:45:23 -------
tracked at https://bugs.launchpad.net/rpm/+bug/911012