From: Richard Guenther <richard.guenther@gmail.com>
To: ami_stuff <ami_stuff@o2.pl>
Cc: gcc@gcc.gnu.org
Subject: Re: "-fno-unswitch-loops" option have no effect?
Date: Mon, 17 Aug 2009 13:33:00 -0000 [thread overview]
Message-ID: <84fc9c000908170438t787f3e75w15c44dd8e9080a2d@mail.gmail.com> (raw)
In-Reply-To: <5dd91bc1.7ff0289a.4a88a6a0.1e15f@o2.pl>
On Mon, Aug 17, 2009 at 2:38 AM, ami_stuff<ami_stuff@o2.pl> wrote:
> Hi,
>
> I found out that when I use "-fno-unswitch-loops" option, it have no effect - loops are unswitched anyway:
>
> -O3 -fno-unswitch-loops
>
> Because of that to avoid -funswitch-loops optimization I must use something like this:
>
> -O2 -finline-functions -fpredictive-commoning -fgcse-after-reload -ftree-vectorize
>
> Is that a bug?
Works fine for me. gcc.dg/tree-ssa/loop-6.c is unswitched with -O3
but not with -O3 -fno-unswitch-loops.
You have to be more specific. Maybe PRE or if-conversion perform
the "unswichting" for you.
Richard.
> Tested with GCC 4.4.1 (m68k).
>
> Regards
>
>
next prev parent reply other threads:[~2009-08-17 11:38 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 [this message]
2009-08-17 13:35 ` ami_stuff
2009-08-17 16:01 ` Paolo Bonzini
2009-08-17 16:07 ` ami_stuff
2009-08-17 16:14 ` Paolo Bonzini
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