linux-kernel - Re: kernel + gcc 4.1 = several problems

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Message-ID: <Pine.LNX.4.64.0701031804320.8503@Phoenix.oltrelinux.com>
Date:	Wed, 3 Jan 2007 18:06:09 +0100 (CET)
From:	l.genoni@...relinux.com
To:	Linus Torvalds <torvalds@...l.org>
cc:	Grzegorz Kulewski <kangur@...com.net>,
	Alan <alan@...rguk.ukuu.org.uk>,
	Mikael Pettersson <mikpe@...uu.se>, s0348365@....ed.ac.uk,
	76306.1226@...puserve.com, akpm@...l.org, bunk@...sta.de,
	greg@...ah.com, linux-kernel@...r.kernel.org,
	yanmin_zhang@...ux.intel.com
Subject: Re: kernel + gcc 4.1 = several problems


Just to make clearer why I am so curious, this from X86_64 X2 3800+:

DarkStar:{venom}:/tmp> gcc -DCMOV -Wall -O2 t.c
DarkStar:{venom}:/tmp>time ./a.out
600000000

real    0m0.151s
user    0m0.150s
sys     0m0.000s
DarkStar:{venom}:/tmp> gcc -Wall -O2 t.c
DarkStar:{venom}:/tmp> time ./a.out
600000000

real    0m0.176s
user    0m0.180s
sys     0m0.000s
DarkStar:{venom}:/tmp>gcc -m32 -DCMOV -Wall -O2 t.c
DarkStar:{venom}:/tmp>time ./a.out
600000000

real    0m0.152s
user    0m0.160s
sys     0m0.000s
DarkStar:{venom}:/tmp>gcc -m32  -Wall -O2 t.c
DarkStar:{venom}:/tmp>time ./a.out
600000000

real    0m0.200s
user    0m0.200s
sys     0m0.000s

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