J3/06-296

To: J3
From: Van Snyder
Date: 26 September 2006
Subject: Comment on IEEE_VALUE --- revision of 06-253


The IEEE Standard allows a processor to convert a signaling NaN to a
quiet NaN if it is involved in an operation.  This compromises the
functionality of IEEE_VALUE.  The standard should recommend that
producing the function result should not be considered to be an
operation.

Insert a new paragraph and note at [462:10+] in 06-007r1:

"It is recommended that the result of IEEE_VALUE is produced in such a
way that the processor does not raise IEEE_INVALID or instantly convert a
signaling NaN to a quiet NaN, especially if the reference is an actual
argument, an output item, or the <expr> in an assignment statement."

  "NOTE 14.12a
  Depending upon the processor, this may require avoiding use of
  floating-point registers."