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Re: NaN encodings

To: Vincent Lefevre <vincent@xxxxxxxxxx>
Cc: stds-754@xxxxxxxxxxxxxxxxx,
        Dan Zuras Intervals <intervals08@xxxxxxxxxxxxxx>
From: Dan Zuras Intervals <intervals08@xxxxxxxxxxxxxx>
Subject: Re: NaN encodings Date: Tue, 24 Mar 2009 13:54:51 -0700


Date: Tue, 24 Mar 2009 15:26:12 +0100
From: Vincent Lefevre <vincent@xxxxxxxxxx>
To: stds-754@xxxxxxxxxxxxxxxxx
Subject: NaN encodings

Hi,

The standard says:

  6.2.1 NaN encodings in binary formats

  [...]
  For binary formats, the payload is encoded in the p-2 least
  significant bits of the trailing significand field.

Shouldn't it say "binary *interchange* formats"?

(In particular one should be careful with the x87 extended precision,
whose format is similar to interchange formats, but does not have an
implicit leading significand bit of 1.)

--
Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <http://www.vinc17.org/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.org/blog/>
Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)


	Why yes it should.  Good catch.  I'll
	pass it on to the IEEE.  Thanks.  - Dan