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: FP negation optimization

From: Robert Dewar <dewar at gnat dot com>
To: Andrew Pinski <pinskia at physics dot uc dot edu>
Cc: Chris Lattner <sabre at nondot dot org>, gcc at gcc dot gnu dot org,Richard Henderson <rth at redhat dot com>
Date: Sun, 01 Feb 2004 19:52:01 -0500
Subject: Re: FP negation optimization
References: <Pine.LNX.4.44.0402011705550.31630-100000@nondot.org> <12EEF394-550B-11D8-8AEA-000393A6D2F2@physics.uc.edu>

Andrew Pinski wrote:

That is because GCC already optimizes it into -X but using a real old compiler


I agree that this optimization is "wrong" if you expect IEEE
semantics to be observed. Interestingly, Ada requires that this
be done right, to be checked!

Follow-Ups:
- Re: FP negation optimization
  - From: Robert Dewar

References:
- Re: FP negation optimization
  - From: Chris Lattner
- Re: FP negation optimization
  - From: Andrew Pinski

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