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]

Re: Bad performance (regression) on oopack's Complex test

From: Paolo Carlini <pcarlini at unitus dot it>
To: Falk Hueffner <falk dot hueffner at student dot uni-tuebingen dot de>
Cc: gcc <gcc at gnu dot org>
Date: Mon, 27 Jan 2003 15:32:28 +0100
Subject: Re: Bad performance (regression) on oopack's Complex test
References: <3E352AA3.9060203@unitus.it> <87znpmhdq8.fsf@student.uni-tuebingen.de>

Falk Hueffner wrote:

Have you tried -O3, or generally tuning inlining?

I have tried both, with no positive results (the inlined operators are very small)

BTW, on Alpha, I can see an improvement:

Nice. In fact on an older PII machine I was seeing Ratios similar to yours.
I think that there is a general issue and a specific one concerning P4 (slowness of memory accesses?)

Just for fun, here's the result of cxx -O5 -fast:

I know :-( ... this is the final goal which icc already achieves on any x86 cpu.

Paolo.

Follow-Ups:
- Re: Bad performance (regression) on oopack's Complex test
  - From: Jan Hubicka

References:
- Bad performance (regression) on oopack's Complex test
  - From: Paolo Carlini
- Re: Bad performance (regression) on oopack's Complex test
  - From: Falk Hueffner

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