X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:from:to:subject:date:reply-to:message-id
	:mime-version:content-type; q=dns; s=default; b=dbkewQN7XirZ0X0a
	wo2cAIiMtSkf4WTi+kn93ltLORGsgzLmhQf57Gq/cyaGE+pcV682zpCklr3yxsOc
	3Ymn3kYFhFWSAs7oMS/SVBNTBv6SI3PP6bgxBBXElYhsFISVBHstmD/Tz4YptJ12
	WdcHf28sKWqm5onSyEf/M1rQjMU=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:from:to:subject:date:reply-to:message-id
	:mime-version:content-type; s=default; bh=hOrpwGELWG3cpPAFthy9jw
	4Jvoc=; b=Bx+ChaISmR37gjefgzgImKvFm2VmeOWUHXd13geFMsmUE97hVDhZl1
	C4MgF72KcPCa2lfFqrok7H4ZAsdItSh24W7WwWLTOLxZxo3Y/dzAtJKet2hVARRL
	F64i9opS1TXTBgD1Je4QoJz8zFSktvhIxS6CFRk7ZYOrp8+BA0TV8=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=-1.2 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.2
X-HELO:	homiemail-a36.g.dreamhost.com
From:	Bengt Larsson <lists DOT cygwin4 AT bengtl DOT net>
To:	cygwin AT cygwin DOT com
Subject:	Performance problem with gcc 4.9.2-3 on 64 bit
Date:	Fri, 27 Feb 2015 17:49:17 +0100
Reply-To:	cygwin AT cygwin DOT com
Message-ID:	<cm61fadkltbqshdmtiil4nb50b0gf1n3qg@4ax.com>
User-Agent:	ForteAgent/7.20.32.1218
MIME-Version:	1.0
X-IsSubscribed:	yes

----=_d081fap6h14spmmajed8v41eqs7ov8asus.MFSBCHJLHS
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Below are two benchmarks that explore maximum floating point
performance. loopm6 is double precision floating point and loopm6fp is
parallell single-precision. They are manually unrolled multiply-add
loops.

I used to reach 2.8 and 11 GFlops on these. Now I only get
2 and 6.

If you explore the inner loop with gcc -O2 -S you can see that it seems
to use few registers.

If you run them, there is a parameter expected. I use 30000 - 50000.

gcc 4.9.2-3 on 64-bit. I use gcc -O2.

----=_d081fap6h14spmmajed8v41eqs7ov8asus.MFSBCHJLHS
Content-Type: application/octet-stream; name=loopm6.c
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=loopm6.c
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----=_d081fap6h14spmmajed8v41eqs7ov8asus.MFSBCHJLHS
Content-Type: application/octet-stream; name=loopm6fp.c
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=loopm6fp.c
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----=_d081fap6h14spmmajed8v41eqs7ov8asus.MFSBCHJLHS
Content-Type: application/octet-stream; name=timers.h
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=timers.h
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----=_d081fap6h14spmmajed8v41eqs7ov8asus.MFSBCHJLHS
Content-Type: text/plain; charset=us-ascii

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
----=_d081fap6h14spmmajed8v41eqs7ov8asus.MFSBCHJLHS--

- Raw text -