Bug 23871

Summary:	[FR] march=i486 by default for i586 repo
Product:	Sisyphus	Reporter:	Michael Shigorin <mike>
Component:	rpm-build	Assignee:	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