From: Paolo Bonzini <bonzini@gnu.org>
To: ami_stuff <ami_stuff@o2.pl>
Cc: Richard Guenther <richard.guenther@gmail.com>, gcc@gcc.gnu.org
Subject: Re: "-fno-unswitch-loops" option have no effect?
Date: Mon, 17 Aug 2009 16:01:00 -0000 [thread overview]
Message-ID: <4A895B1A.1010501@gnu.org> (raw)
In-Reply-To: <171913d8.edfa43f.4a894dda.88a2c@o2.pl>
On 08/17/2009 02:32 PM, ami_stuff wrote:
> Hi,
>
>> Works fine for me. gcc.dg/tree-ssa/loop-6.c is unswitched with -O3
>> but not with -O3 -fno-unswitch-loops.
>
> This one works for me too.
>
> Could you try to compile "deflate.c" from libz?
>
> Here are my results:
>
> -m68060 -O3 -fno-unswitch-loops - 12,9kb
> -m68060 -O3 - 12,9kb
> -m68060 -O2 -finline-functions -fgcse-after-reload -ftree-vectorize -fpredictive-commoning - 12,4kb
And why do you think that loop unswitching has anything to do with the
size growth?
BTW, -O3 is not guaranteed to give better performance than -O2.
Paolo
next prev parent reply other threads:[~2009-08-17 13:29 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-17 7:19 ami_stuff
[not found] ` <56d259a00908170344v54442954u3a5d0337de3b98fe@mail.gmail.com>
2009-08-17 13:29 ` ami_stuff
2009-08-17 19:42 ` Bernd Roesch
2009-08-17 19:54 ` ami_stuff
2009-08-17 22:16 ` Alexander Strange
2009-08-17 13:33 ` Richard Guenther
2009-08-17 13:35 ` ami_stuff
2009-08-17 16:01 ` Paolo Bonzini [this message]
2009-08-17 16:07 ` ami_stuff
2009-08-17 16:14 ` Paolo Bonzini
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