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diff --git a/src/libs/softfloat-3e/doc/SoftFloat-history.html b/src/libs/softfloat-3e/doc/SoftFloat-history.html new file mode 100644 index 00000000..d81c6bc5 --- /dev/null +++ b/src/libs/softfloat-3e/doc/SoftFloat-history.html @@ -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> + |