patch-2.1.73 linux/arch/i386/math-emu/README

• Lines: 54
• Date: Tue Dec 9 17:57:09 1997
• Orig file: v2.1.72/linux/arch/i386/math-emu/README
• Orig date: Tue Oct 29 05:16:36 1996

diff -u --recursive --new-file v2.1.72/linux/arch/i386/math-emu/README linux/arch/i386/math-emu/README
@@ -1,7 +1,7 @@
  +---------------------------------------------------------------------------+
  |  wm-FPU-emu   an FPU emulator for 80386 and 80486SX microprocessors.      |
  |                                                                           |
- | Copyright (C) 1992,1993,1994,1995,1996                                    |
+ | Copyright (C) 1992,1993,1994,1995,1996,1997                               |
  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
  |                       Australia.  E-mail billm@suburbia.net               |
  |                                                                           |
@@ -44,9 +44,12 @@
 Please report bugs, etc to me at:
        billm@suburbia.net
 
+For more information on the emulator and on floating point topics, see
+my web pages, currently at  http://www.suburbia.net/~billm/
+
 
 --Bill Metzenthen
-  October 1996
+  December 1997
 
 
 ----------------------- Internals of wm-FPU-emu -----------------------
@@ -95,8 +98,9 @@
 ----------------------- Limitations of wm-FPU-emu -----------------------
 
 There are a number of differences between the current wm-FPU-emu
-(version 1.20) and the 80486 FPU (apart from bugs). Some of the more
-important differences are listed below:
+(version 2.00) and the 80486 FPU (apart from bugs).  The differences
+are fewer than those which applied to the 1.xx series of the emulator.
+Some of the more important differences are listed below:
 
 The Roundup flag does not have much meaning for the transcendental
 functions and its 80486 value with these functions is likely to differ
@@ -121,18 +125,6 @@
 and Unnormals. None of these will be generated by an 80486 or by the
 emulator. Do not use them. The emulator treats them differently in
 detail from the way an 80486 does.
-
-The emulator treats PseudoDenormals differently from an 80486. These
-numbers are in fact properly normalised numbers with the exponent
-offset by 1, and the emulator treats them as such. Unlike the 80486,
-the emulator does not generate a Denormal Operand exception for these
-numbers. The arithmetical results produced when using such a number as
-an operand are the same for the emulator and a real 80486 (apart from
-any slight precision difference for the transcendental functions).
-Neither the emulator nor an 80486 produces one of these numbers as the
-result of any arithmetic operation. An 80486 can keep one of these
-numbers in an FPU register with its identity as a PseudoDenormal, but
-the emulator will not; they are always converted to a valid number.
 
 Self modifying code can cause the emulator to fail. An example of such
 code is: