mirror of
https://github.com/urbit/shrub.git
synced 2024-12-24 03:14:30 +03:00
146 lines
3.3 KiB
HTML
146 lines
3.3 KiB
HTML
|
|
||
|
|
<HTML>
|
||
|
|
|
||
|
|
<HEAD>
|
||
|
|
<TITLE>Berkeley SoftFloat History</TITLE>
|
||
|
|
</HEAD>
|
||
|
|
|
||
|
|
<BODY>
|
||
|
|
|
||
|
|
<H1>History of Berkeley SoftFloat, to Release 3</H1>
|
||
|
|
|
||
|
|
<P>
|
||
|
|
John R. Hauser<BR>
|
||
|
|
2015 February 16<BR>
|
||
|
|
</P>
|
||
|
|
|
||
|
|
|
||
|
|
<H3>Release 3 (2015 February)</H3>
|
||
|
|
|
||
|
|
<UL>
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Complete rewrite, funded by the University of California, Berkeley, and
|
||
|
|
consequently having a different use license than earlier releases.
|
||
|
|
Major changes included renaming most types and functions, upgrading some
|
||
|
|
algorithms, restructuring the source files, and making SoftFloat into a true
|
||
|
|
library.
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Added functions to convert between floating-point and unsigned integers, both
|
||
|
|
<NOBR>32-bit</NOBR> and <NOBR>64-bit</NOBR> (<CODE>uint32_t</CODE> and
|
||
|
|
<CODE>uint64_t</CODE>).
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Added functions for fused multiply-add, for all supported floating-point
|
||
|
|
formats except <NOBR>80-bit</NOBR> double-extended-precision.
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Added support for a fifth rounding mode, <CODE>near_maxMag</CODE> (round to
|
||
|
|
nearest, with ties to maximum magnitude, away from zero).
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Dropped the <CODE>timesoftfloat</CODE> program (now part of the Berkeley
|
||
|
|
TestFloat package).
|
||
|
|
|
||
|
|
</UL>
|
||
|
|
|
||
|
|
|
||
|
|
<H3>Release 2c (2015 January)</H3>
|
||
|
|
|
||
|
|
<UL>
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Fixed mistakes affecting some <NOBR>64-bit</NOBR> processors.
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Further improved the documentation and the wording for the legal restrictions
|
||
|
|
on using SoftFloat releases <NOBR>through 2c</NOBR> (not applicable to
|
||
|
|
<NOBR>Release 3</NOBR> or later).
|
||
|
|
|
||
|
|
</UL>
|
||
|
|
|
||
|
|
|
||
|
|
<H3>Release 2b (2002 May)</H3>
|
||
|
|
|
||
|
|
<UL>
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Made minor updates to the documentation, including improved wording for the
|
||
|
|
legal restrictions on using SoftFloat.
|
||
|
|
|
||
|
|
</UL>
|
||
|
|
|
||
|
|
|
||
|
|
<H3>Release 2a (1998 December)</H3>
|
||
|
|
|
||
|
|
<UL>
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Added functions to convert between <NOBR>64-bit</NOBR> integers
|
||
|
|
(<CODE>int64</CODE>) and all supported floating-point formats.
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Fixed a bug in all <NOBR>64-bit</NOBR>-version square root functions except
|
||
|
|
<CODE>float32_sqrt</CODE> that caused the result sometimes to be off by
|
||
|
|
<NOBR>1 unit</NOBR> in the last place (<NOBR>1 ulp</NOBR>) from what it should
|
||
|
|
be.
|
||
|
|
(Bug discovered by Paul Donahue.)
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Improved the Makefiles.
|
||
|
|
</UL>
|
||
|
|
|
||
|
|
|
||
|
|
<H3>Release 2 (1997 June)</H3>
|
||
|
|
|
||
|
|
<UL>
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Created the <NOBR>64-bit</NOBR> (<CODE>bits64</CODE>) version, adding the
|
||
|
|
<CODE>floatx80</CODE> and <CODE>float128</CODE> formats.
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Changed the source directory structure, splitting the sources into a
|
||
|
|
<CODE>bits32</CODE> and a <CODE>bits64</CODE> version.
|
||
|
|
Renamed <CODE>environment.h</CODE> to <CODE>milieu.h</CODE> to avoid confusion
|
||
|
|
with environment variables.
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Fixed a small error that caused <CODE>float64_round_to_int</CODE> often to
|
||
|
|
round the wrong way in nearest/even mode when the operand was between
|
||
|
|
2<SUP>20</SUP> and 2<SUP>21</SUP> and halfway between two integers.
|
||
|
|
|
||
|
|
</UL>
|
||
|
|
|
||
|
|
|
||
|
|
<H3>Release 1a (1996 July)</H3>
|
||
|
|
|
||
|
|
<UL>
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Corrected a mistake that caused borderline underflow cases not to raise the
|
||
|
|
underflow flag when they should have.
|
||
|
|
(Problem reported by Doug Priest.)
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Added the <CODE>float_detect_tininess</CODE> variable to control whether
|
||
|
|
tininess is detected before or after rounding.
|
||
|
|
|
||
|
|
</UL>
|
||
|
|
|
||
|
|
|
||
|
|
<H3>Release 1 (1996 July)</H3>
|
||
|
|
|
||
|
|
<UL>
|
||
|
|
|
||
|
|
<LI>
|
||
|
|
Original release, based on work done for the International Computer Science
|
||
|
|
Institute (ICSI) in Berkeley, California.
|
||
|
|
|
||
|
|
</UL>
|
||
|
|
|
||
|
|
|
||
|
|
</BODY>
|
||
|
|
|