Bug 23871

Summary: [FR] march=i486 by default for i586 repo
Product: Sisyphus Reporter: Michael Shigorin <mike>
Component: rpm-buildAssignee: placeholder <placeholder>
Status: NEW --- QA Contact: qa-sisyphus
Severity: enhancement    
Priority: P3 CC: arseny, evg, glebfm, imz, ldv, n3npq, placeholder, vsu, vt
Version: unstable   
Hardware: x86   
OS: Linux   

Description Michael Shigorin 2010-08-10 18:30:22 MSD
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 Jeff Johnson 2012-01-03 02:45:23 MSK
tracked at https://bugs.launchpad.net/rpm/+bug/911012