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Subject: ANS FORTH TECHNICAL COMMITTEE
Message-ID: <1615.UUL1.3#5129@willett.pgh.pa.us>
Date: 27 Aug 90 03:30:57 GMT
Organization: String, Scotch tape, and Paperclips.  (in Pgh, PA)
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 Date: 08-23-90 (08:25)              Number: 464 (Echo)
   To: ALL                           Refer#: NONE
 From: JACK BROWN                      Read: (N/A)
 Subj: X3J14 MEETING 13              Status: PUBLIC MESSAGE

 Part 2 of Keep Floating-Point Stack.

 +------------------------------------------------------+---------------+
 |  ANSI X3J14 Forth Technical Proposal, cont'd         |Page 2  of 2   |
 +------------------------------------------------------+---------------|
 |  Title:  Keep floating-point Stack                                   |
 +----------------------------------------------------------------------+
 |  6) Add the following sentence to 6.7.3 floating-point stack         |
 |     Floating point-stack notation when the floating-point stack      |
 |     is separate is for example                                       |
 |                                                                      |
 |     F!  ( a-addr -- ) ( F: r -- )                                    |
 |     or                                                               |
 |     F!  ( r a-addr -- )                                              |
 |     when kept on the data stack.                                     |
 |                                                                      |
 |  7) Create a combined data stack diagram for all floating point      |
 |     words using the following algorithm:                             |
 |     If floating-point numbers are kept on the data stack the         |
 |     stack notation  ( F: before -- after )  should be read as data   |
 |     stack notation.  If data stack notation present then             |
 |     the data stack "before" arguments are placed on top or after     |
 |     the floating-point "before arguments".                           |
 |                                                                      |
 |                                                                      |
 +----------------------------------------------------------------------+
 |  Discussion:                                                         |
 |                                                                      |
 |  1) The phrase floating-point  xxxx   and floating-point  xxxx       |
 |     where xxxx = stack , number , equality  etc are both used in     |
 |     the document.  We should be consistent and use one or the other. |
 |     I prefer    hyphens.                                             |
 |                                                                      |
 |  2) This will allow an ANS Forth program to determine how the        |
 |     floating-point stack is implemented which should address the     |
 |     concern of proposal TP90-729                                     |
 |                                                                      |
 |  3) Update 4.0410 to reflect change to ENVIRONMENT?                  |
 |                                                                      |
 |  4) Modify definition of FDEPTH to allow for floating-point numbers  |
 |     on the data stack.  When floating-point numbers are kept on the  |
 |     data stack the following definition of FDEPTH should work in     |
 |     many systems.  : FDEPTH   DEPTH CELLS 1 REALS / ;                |
 |     This assumes that numbers would be represented in memory the     |
 |     the same as they are on the data stack.                          |
 |                                                                      |
 |  5) The designation of   r   for floating-point number is missing    |
 |     from 6.8.1                                                       |
 |                                                                      |
 |6&7) We need to state how to read the floating-point stack notation   |
 |     when floating-point numbers are kept on the data stack.  The     |
 |     alternative is to explicitly give the alternate data stack       |
 |     notation for each word that has floating-point stack notation.   |
 |                                                                      |
 +----------------------------------------------------------------------+
 |  Submitted by: Jack W. Brown 

 NET/Mail : British Columbia Forth Board - Burnaby BC - (604)434-5886   
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