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Re: [PATCH] Optimize abs(x) < 0.0

From: Richard Henderson <rth at redhat dot com>
To: Gabriel Dos Reis <gdr at codesourcery dot com>
Cc: Roger Sayle <roger at eyesopen dot com>, gcc-patches at gcc dot gnu dot org
Date: Sun, 21 Jul 2002 18:13:50 -0700
Subject: Re: [PATCH] Optimize abs(x) < 0.0
References: <Pine.LNX.4.33.0207211600440.30127-100000@www.eyesopen.com> <m31y9w7kqx.fsf@soliton.integrable-solutions.net>

> 2) Even in the case where fabs(x)
> may not cause a trap by itself, the expression
> 
>    fabs(x) < 0.0 
> 
> may because of the comparaison (SPARC V9 for example has mode to
> trigger exception when comparing a signaling NaN against something).

We don't preserve signals anywere else in gcc (e.g. eliminated
because the result is dead).  I don't see why we should start now.


r~

Follow-Ups:
- Re: [PATCH] Optimize abs(x) < 0.0
  - From: Gabriel Dos Reis

References:
- Re: [PATCH] Optimize abs(x) < 0.0
  - From: Roger Sayle
- Re: [PATCH] Optimize abs(x) < 0.0
  - From: Gabriel Dos Reis

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