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Re: optimization/4714: Haney's real matrix performance regression
- From: Daniel Berlin <dan at dberlin dot org>
- To: nobody at gcc dot gnu dot org
- Cc: gcc-prs at gcc dot gnu dot org,
- Date: 3 Apr 2002 17:06:03 -0000
- Subject: Re: optimization/4714: Haney's real matrix performance regression
- Reply-to: Daniel Berlin <dan at dberlin dot org>
The following reply was made to PR optimization/4714; it has been noted by GNATS.
From: Daniel Berlin <dan@dberlin.org>
To: Paolo Carlini <pcarlini@unitus.it>
Cc: rth@gcc.gnu.org, <CGLeggett@lbl.gov>, <gcc-bugs@gcc.gnu.org>,
<gcc-prs@gcc.gnu.org>, <nobody@gcc.gnu.org>,
<pete@ltoi.iap.physik.tu-darmstadt.de>, <gcc-gnats@gcc.gnu.org>
Subject: Re: optimization/4714: Haney's real matrix performance regression
Date: Wed, 3 Apr 2002 12:03:21 -0500 (EST)
On Wed, 3 Apr 2002, Paolo Carlini wrote:
> rth@gcc.gnu.org wrote:
>
> > Somehow we're not recognizing *any* givs.
> >
> Hi!
>
> What will you think of me if I blatantly confess to have /no idea/ what
> a "giv" is? :-(
> (I would like to learn more, however)
General induction variable.
for (i = 0; i < 50; i ++)
{
a = i * 5;
}
i is a biv (basic induction variable).
a is a giv, since it's a linear function of a biv.
--Dan