Message-
From: Paolo Bonzini [mailto:[EMAIL PROTECTED] On Behalf Of Paolo
Bonzini
Sent: 10 July 2008 13:34
To: Bingfeng Mei
Cc: Steven Bosscher; gcc@gcc.gnu.org
Subject: Re: Inefficient loop unrolling.
Bingfeng Mei wrote:
> Steven,
> I just created a bug report. You should receive a CCed ma
Bingfeng Mei wrote:
Steven,
I just created a bug report. You should receive a CCed mail now.
I can see these issues are solvable at RTL-level, but require lots of
efforts. The main optimization in loop unrolling pass, split iv, can
reduce dependence chain but not extra ADDs and alias issue. What
that loop unrolling should belong to RTL level? Is it
fundamental?
Cheers,
Bingfeng
-Original Message-
From: Steven Bosscher [mailto:[EMAIL PROTECTED]
Sent: 02 July 2008 17:01
To: Bingfeng Mei
Cc: gcc@gcc.gnu.org
Subject: Re: Inefficient loop unrolling.
On Wed, Jul 2, 2008 at 1:13 PM
On Wed, Jul 2, 2008 at 1:13 PM, Bingfeng Mei <[EMAIL PROTECTED]> wrote:
> Hello,
> I am looking at GCC's loop unrolling and find it quite inefficient
> compared with manually unrolled loop even for very simple loop. The
> followings are a simple loop and its manually unrolled version. I didn't
> ap
) has signed company-wide FSF copyright assignment.
Cheers,
Bingfeng
-Original Message-
From: Richard Guenther [mailto:[EMAIL PROTECTED]
Sent: 02 July 2008 12:59
To: Bingfeng Mei
Cc: gcc@gcc.gnu.org
Subject: Re: Inefficient loop unrolling.
On Wed, Jul 2, 2008 at 1:13 PM, Bingfeng Mei
On Wed, Jul 2, 2008 at 1:13 PM, Bingfeng Mei <[EMAIL PROTECTED]> wrote:
> Hello,
> I am looking at GCC's loop unrolling and find it quite inefficient
> compared with manually unrolled loop even for very simple loop. The
> followings are a simple loop and its manually unrolled version. I didn't
> ap
Hello,
I am looking at GCC's loop unrolling and find it quite inefficient
compared with manually unrolled loop even for very simple loop. The
followings are a simple loop and its manually unrolled version. I didn't
apply any trick on manually unrolled one as it is exact replications of
original loo
