This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

BB reorder forced off for -Os

From: "Ian Bolton" <bolton at IceraSemi dot com>
To: <gcc at gcc dot gnu dot org>
Date: Tue, 23 Mar 2010 18:05:39 -0000
Subject: BB reorder forced off for -Os
References: <4D60B0700D1DB54A8C0C6E9BE69163700E08F38E@EXCHANGEVS.IceraSemi.local> <571f6b511003190943r65c1bde8kd0b136fa08504d9a@mail.gmail.com> <4D60B0700D1DB54A8C0C6E9BE69163700E08FFC2@EXCHANGEVS.IceraSemi.local> <C681F561-A39B-4319-8ECF-765095982882@blueteddy.net>

Is there any reason why BB reorder has been disabled
in bb-reorder.c for -Os, such that you can't even
turn it on with -freorder-blocks?

From what I've heard on this list in recent days,
BB reorder gives good performance wins such that
most people would still want it on even if it did
increase code size a little.

Cheers,
Ian

Follow-Ups:
- RE: BB reorder forced off for -Os
  - From: Paul Koning
- Re: BB reorder forced off for -Os
  - From: Steven Bosscher

References:
- Understanding Scheduling
  - From: Ian Bolton
- Re: Understanding Scheduling
  - From: Steven Bosscher
- RE: Understanding Scheduling
  - From: Ian Bolton
- Re: Understanding Scheduling
  - From: Dave Hudson

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]