From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-return-94998-listarch-gcc=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 32102 invoked by alias); 27 Apr 2004 22:14:54 -0000
Mailing-List: contact gcc-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Archive: <http://gcc.gnu.org/ml/gcc/>
List-Post: <mailto:gcc@gcc.gnu.org>
List-Help: <http://gcc.gnu.org/ml/>
Sender: gcc-owner@gcc.gnu.org
Received: (qmail 32087 invoked from network); 27 Apr 2004 22:14:53 -0000
Received: from unknown (HELO smtp1.fuse.net) (216.68.8.171)
  by sources.redhat.com with SMTP; 27 Apr 2004 22:14:53 -0000
Received: from dellpi.pinski.fam ([66.42.245.227]) by smtp1.fuse.net
          (InterMail vM.6.00.05.02 201-2115-109-103-20031105) with ESMTP
          id <20040427221451.GKSS11594.smtp1.fuse.net@dellpi.pinski.fam>;
          Tue, 27 Apr 2004 18:14:51 -0400
Received: from [127.0.0.1] (IDENT:pinskia@localhost.pinski.fam [127.0.0.1])
	by dellpi.pinski.fam (8.12.2/8.12.1) with ESMTP id i3RMEoxj004442;
	Tue, 27 Apr 2004 18:14:51 -0400 (EDT)
In-Reply-To: <408ED9A7.5060603@physik.uni-muenchen.de>
References: <408ECD52.2090709@physik.uni-muenchen.de> <23B628D8-9891-11D8-9EA6-000393A6D2F2@physics.uc.edu> <408ED9A7.5060603@physik.uni-muenchen.de>
Mime-Version: 1.0 (Apple Message framework v613)
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Message-Id: <403C2B22-9898-11D8-9EA6-000393A6D2F2@physics.uc.edu>
Content-Transfer-Encoding: quoted-printable
Cc: GCC Fortran mailing list <fortran@gcc.gnu.org>,
   "gcc@gcc.gnu.org list" <gcc@gcc.gnu.org>,
   Andrew Pinski <pinskia@physics.uc.edu>
From: Andrew Pinski <pinskia@physics.uc.edu>
Subject: Re: [gfortran] Exponentiation by integral exponents
Date: Wed, 28 Apr 2004 02:56:00 -0000
To: =?ISO-8859-1?Q?Tobias_Schl=FCter?= <tobias.schlueter@physik.uni-muenchen.de>
X-SW-Source: 2004-04/txt/msg01288.txt.bz2


On Apr 27, 2004, at 18:07, Tobias Schl=FCter wrote:

> Andrew Pinski wrote:
>> On Apr 27, 2004, at 17:14, Tobias Schl=FCter wrote:
>>>
>>> FYI I have ported Andy's code for exponentiation by an integral=20
>>> exponent to our tree. This is an implementation of Knuth's algorithm
> ...
>> You should not need it if you use __builtin_pow and you turn on
>> flag_unsafe_math_optimizations on.  Maybe the best way is to have=20
>> another flag
>> to say expand __builtin_pow always.
>
> Does the builtin recognize the case pow(x,(float)i), where i is an=20
> integer? Then this sounds like a very good idea.

Yes it does except that flag_unsafe_math_optimizations has to be true=20
but we can
easily change that.

Thanks,
Andrew Pinski