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Re: GCC mini-summit - compiling for a particular architecture

From: Robert Dewar <dewar at adacore dot com>
To: Steve Ellcey <sje at cup dot hp dot com>
Cc: aaw at google dot com, kenneth dot hoste at elis dot ugent dot be, gcc at gcc dot gnu dot org
Date: Fri, 20 Apr 2007 19:28:57 -0400
Subject: Re: GCC mini-summit - compiling for a particular architecture
References: <200704202322.QAA29468@hpsje.cup.hp.com>

Steve Ellcey wrote:

This seems unfortunate.  I was hoping I might be able to turn on loop
unrolling for IA64 at -O2 to improve performance.  I have only started
looking into this idea but it seems to help performance quite a bit,
though it is also increasing size quite a bit too so it may need some
modification of the unrolling parameters to make it practical.


To me it is obvious that optimizations are target dependent. For
instance loop unrolling is really a totally different optimization
on the ia64 as a result of the rotating registers.

Follow-Ups:
- Re: GCC mini-summit - compiling for a particular architecture
  - From: Zdenek Dvorak
- Re: GCC mini-summit - compiling for a particular architecture
  - From: Laurent GUERBY

References:
- Re: GCC mini-summit - compiling for a particular architecture
  - From: Steve Ellcey

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