Added Berkeley softfloat library
(http://www.jhauser.us/arithmetic/SoftFloat.html) with RISCV specialization and cmake build
This commit is contained in:
258
softfloat/doc/SoftFloat-history.html
Normal file
258
softfloat/doc/SoftFloat-history.html
Normal file
@@ -0,0 +1,258 @@
|
||||
|
||||
<HTML>
|
||||
|
||||
<HEAD>
|
||||
<TITLE>Berkeley SoftFloat History</TITLE>
|
||||
</HEAD>
|
||||
|
||||
<BODY>
|
||||
|
||||
<H1>History of Berkeley SoftFloat, to Release 3e</H1>
|
||||
|
||||
<P>
|
||||
John R. Hauser<BR>
|
||||
2018 January 20<BR>
|
||||
</P>
|
||||
|
||||
|
||||
<H3>Release 3e (2018 January)</H3>
|
||||
|
||||
<UL>
|
||||
|
||||
<LI>
|
||||
Changed the default numeric code for optional rounding mode <CODE>odd</CODE>
|
||||
(round to odd, also known as <EM>jamming</EM>) from 5 to 6.
|
||||
|
||||
<LI>
|
||||
Modified the behavior of rounding mode <CODE>odd</CODE> when rounding to an
|
||||
integer value (either conversion to an integer format or a
|
||||
‘<CODE>roundToInt</CODE>’ function).
|
||||
Previously, for those cases only, rounding mode <CODE>odd</CODE> acted the same
|
||||
as rounding to minimum magnitude.
|
||||
Now all operations are rounded consistently.
|
||||
|
||||
<LI>
|
||||
Fixed some errors in the specialization code modeling Intel x86 floating-point,
|
||||
specifically the integers returned on invalid operations and the propagation of
|
||||
NaN payloads in a few rare cases.
|
||||
|
||||
<LI>
|
||||
Added specialization code modeling ARM floating-point, conforming to VFPv2 or
|
||||
later.
|
||||
|
||||
<LI>
|
||||
Added an example target for ARM processors.
|
||||
|
||||
<LI>
|
||||
Fixed a minor bug whereby function <CODE>f16_to_ui64</CODE> might return a
|
||||
different integer than expected in the case that the floating-point operand is
|
||||
negative.
|
||||
|
||||
<LI>
|
||||
Added example target-specific optimization for GCC, employing GCC instrinsics
|
||||
and support for <NOBR>128-bit</NOBR> integer arithmetic.
|
||||
|
||||
<LI>
|
||||
Made other minor improvements.
|
||||
|
||||
</UL>
|
||||
|
||||
|
||||
<H3>Release 3d (2017 August)</H3>
|
||||
|
||||
<UL>
|
||||
|
||||
<LI>
|
||||
Fixed bugs in the square root functions for <NOBR>64-bit</NOBR>
|
||||
double-precision, <NOBR>80-bit</NOBR> double-extended-precision, and
|
||||
<NOBR>128-bit</NOBR> quadruple-precision.
|
||||
For <NOBR>64-bit</NOBR> double-precision (<CODE>f64_sqrt</CODE>), the result
|
||||
could sometimes be off by <NOBR>1 unit</NOBR> in the last place
|
||||
(<NOBR>1 ulp</NOBR>) from what it should be.
|
||||
For the larger formats, the square root could be wrong in a large portion of
|
||||
the less-significant bits.
|
||||
(A bug in <CODE>f128_sqrt</CODE> was first reported by Alexei Sibidanov.)
|
||||
|
||||
</UL>
|
||||
|
||||
|
||||
<H3>Release 3c (2017 February)</H3>
|
||||
|
||||
<UL>
|
||||
|
||||
<LI>
|
||||
Added optional rounding mode <CODE>odd</CODE> (round to odd, also known as
|
||||
<EM>jamming</EM>).
|
||||
|
||||
<LI>
|
||||
Corrected the documentation concerning non-canonical representations in
|
||||
<NOBR>80-bit</NOBR> double-extended-precision.
|
||||
|
||||
</UL>
|
||||
|
||||
|
||||
<H3>Release 3b (2016 July)</H3>
|
||||
|
||||
<UL>
|
||||
|
||||
<LI>
|
||||
Implemented the common <NOBR>16-bit</NOBR> “half-precision”
|
||||
floating-point format (<CODE>float16_t</CODE>).
|
||||
|
||||
<LI>
|
||||
Made the integer values returned on invalid conversions to integer formats
|
||||
be determined by the port-specific specialization instead of being the same for
|
||||
all ports.
|
||||
|
||||
<LI>
|
||||
Added preprocessor macro <CODE>THREAD_LOCAL</CODE> to allow the floating-point
|
||||
state (modes and exception flags) to be made per-thread.
|
||||
|
||||
<LI>
|
||||
Modified the provided Makefiles to allow some options to be overridden from the
|
||||
<CODE>make</CODE> command.
|
||||
|
||||
<LI>
|
||||
Made other minor improvements.
|
||||
|
||||
</UL>
|
||||
|
||||
|
||||
<H3>Release 3a (2015 October)</H3>
|
||||
|
||||
<UL>
|
||||
|
||||
<LI>
|
||||
Replaced the license text supplied by the University of California, Berkeley.
|
||||
|
||||
</UL>
|
||||
|
||||
|
||||
<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>
|
||||
|
||||
Reference in New Issue
Block a user