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FP negation optimization

From: Chris Lattner <sabre at nondot dot org>
To: gcc at gcc dot gnu dot org
Date: Sun, 1 Feb 2004 02:50:31 -0600 (CST)
Subject: FP negation optimization

Is '-0.0 - X' always guaranteed to be the same as '-X' with IEEE math?
If so, GCC should know this.  :)  Right now it does get it right with
-ffast-math, but not by default.

-Chris

-- 
http://llvm.cs.uiuc.edu/
http://www.nondot.org/~sabre/Projects/

Follow-Ups:
- Re: FP negation optimization
  - From: Richard Henderson

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