J3/05-113

Date:    4 Jan 2005
To:      J3
From:    Fred Tydeman
Subject: logb(denormal), logb(NaN), logb(INF)

NUMBER:  F03/0034
TITLE:  IEEE_LOGB()
KEYWORDS: IEEE-754, logb()
DEFECT TYPE:  ???
STATUS: For consideration

QUESTION:

What is logb(denormal)?  Is it of the hardware representation,
or is it as if the hardware had an unbounded exponent range?

What is logb(NaN)?  logb(-INF)?  logb(+INF)?

DISCUSSION:

logb() should be defined as if the hardware representation had
an unbounded exponent range.

logb(NaN) should be the same NaN; shall be a NaN.

logb(-INF) shall be +INF

logb(+INF) shall be +INF

ANSWER:

EDITS:

All edits refer to 04-007.pdf.

SUBMITTED BY: Fred Tydeman

HISTORY: J3/05-113  m171 Submitted