This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: weird optimization in sin+cos, x86 backend

From: Robert Dewar <dewar at adacore dot com>
To: Michael Matz <matz at suse dot de>
Cc: Konstantin Vladimirov <konstantin dot vladimirov at gmail dot com>, Richard Guenther <richard dot guenther at gmail dot com>, gcc at gcc dot gnu dot org
Date: Fri, 03 Feb 2012 10:13:58 -0500
Subject: Re: weird optimization in sin+cos, x86 backend
References: <CADn89gRRwQ5uPGCDMGZo28ofnAQsvU5PURKxPuvOPF1+ZbvO8g@mail.gmail.com> <CAFiYyc1oLgmP-bs2eyvW134SEzLONUxpcgiXMS4XnmamrUZ-9Q@mail.gmail.com> <Pine.LNX.4.64.1202031535030.25409@wotan.suse.de>

On 2/3/2012 10:01 AM, Michael Matz wrote:

No normal math library supports such an extreme range, even basic
identities (like cos^2+sin^2=1) aren't retained with such inputs.


I agree: the program is complete nonsense. It would be useful to know
what the intent was.

Ciao,
Michael.

Follow-Ups:
- Re: weird optimization in sin+cos, x86 backend
  - From: Vincent Lefevre
- Re: weird optimization in sin+cos, x86 backend
  - From: Konstantin Vladimirov
- Re: weird optimization in sin+cos, x86 backend
  - From: Toon Moene

References:
- weird optimization in sin+cos, x86 backend
  - From: Konstantin Vladimirov
- Re: weird optimization in sin+cos, x86 backend
  - From: Richard Guenther
- Re: weird optimization in sin+cos, x86 backend
  - From: Michael Matz

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]