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Re: wish: optimize (x > 0.) floating point comparison.

To: Branko Cibej <branko dot cibej at hermes dot si>, Richard Henderson <rth at cygnus dot com>
Subject: Re: wish: optimize (x > 0.) floating point comparison.
From: Richard Henderson <rth at cygnus dot com>
Date: Fri, 25 Sep 1998 00:28:57 -0700
Cc: Robert L Krawitz <rlk at tiac dot net>, yotam_medini at avanticorp dot com, egcs at cygnus dot com
References: <199809222031.NAA16702@telaviv.avanticorp.com> <199809222048.QAA17629@rlk-ppp-1.torrent.com> <19980923212543.D27280@dot.cygnus.com> <360B421E.26771490@hermes.si>
Reply-To: Richard Henderson <rth at cygnus dot com>

On Fri, Sep 25, 1998 at 09:11:27AM +0200, Branko Cibej wrote:
> I think that's a bit strong. After all, the 80-bit float format used is
> an IEEE standard, as far as I know.

Well, if you consider a standard used by exactly one machine "standard"...

> And what's wrong with having 80-bit
> long doubles instead of 128-bit ones?

No, what's wrong is that it is impossible to get intermediate results
properly rounded without sacrificing all performance.

r~

References:
- Re: wish: optimize (x > 0.) floating point comparison.
  - From: Yotam Medini
- Re: wish: optimize (x > 0.) floating point comparison.
  - From: Robert L Krawitz
- Re: wish: optimize (x > 0.) floating point comparison.
  - From: Richard Henderson
- Re: wish: optimize (x > 0.) floating point comparison.
  - From: Branko Cibej

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