The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/softfloat.h

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /* $NetBSD: softfloat.h,v 1.1 2001/04/26 03:10:48 ross Exp $ */
    2 
    3 /* This is a derivative work. */
    4 
    5 /*-
    6  * Copyright (c) 2001 The NetBSD Foundation, Inc.
    7  * All rights reserved.
    8  *
    9  * This code is derived from software contributed to The NetBSD Foundation
   10  * by Ross Harvey.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *        This product includes software developed by the NetBSD
   23  *        Foundation, Inc. and its contributors.
   24  * 4. Neither the name of The NetBSD Foundation nor the names of its
   25  *    contributors may be used to endorse or promote products derived
   26  *    from this software without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   29  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   30  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   31  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   32  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   33  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   34  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   35  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   36  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   37  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   38  * POSSIBILITY OF SUCH DAMAGE.
   39  */
   40 
   41 /*
   42 ===============================================================================
   43 
   44 This C header file is part of the SoftFloat IEC/IEEE Floating-point
   45 Arithmetic Package, Release 2a.
   46 
   47 Written by John R. Hauser.  This work was made possible in part by the
   48 International Computer Science Institute, located at Suite 600, 1947 Center
   49 Street, Berkeley, California 94704.  Funding was partially provided by the
   50 National Science Foundation under grant MIP-9311980.  The original version
   51 of this code was written as part of a project to build a fixed-point vector
   52 processor in collaboration with the University of California at Berkeley,
   53 overseen by Profs. Nelson Morgan and John Wawrzynek.  More information
   54 is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
   55 arithmetic/SoftFloat.html'.
   56 
   57 THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort
   58 has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
   59 TIMES RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO
   60 PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
   61 AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
   62 
   63 Derivative works are acceptable, even for commercial purposes, so long as
   64 (1) they include prominent notice that the work is derivative, and (2) they
   65 include prominent notice akin to these four paragraphs for those parts of
   66 this code that are retained.
   67 
   68 ===============================================================================
   69 */
   70 
   71 #include <sys/types.h>
   72 
   73 #if !defined(_KERNEL) && !defined(_STANDALONE)
   74 #include <inttypes.h>
   75 #include <ieeefp.h>
   76 #else
   77 #include "sys/inttypes.h"
   78 #include "machine/ieeefp.h"
   79 #endif
   80 #include <sys/endian.h>
   81 
   82 /*
   83 -------------------------------------------------------------------------------
   84 The macro `FLOATX80' must be defined to enable the extended double-precision
   85 floating-point format `floatx80'.  If this macro is not defined, the
   86 `floatx80' type will not be defined, and none of the functions that either
   87 input or output the `floatx80' type will be defined.  The same applies to
   88 the `FLOAT128' macro and the quadruple-precision format `float128'.
   89 -------------------------------------------------------------------------------
   90 */
   91 /* #define FLOATX80 */
   92 /* #define FLOAT128 */
   93 
   94 /*
   95 -------------------------------------------------------------------------------
   96 Software IEC/IEEE floating-point types.
   97 -------------------------------------------------------------------------------
   98 */
   99 typedef u_int32_t float32;
  100 typedef u_int64_t float64;
  101 #ifdef FLOATX80
  102 typedef struct {
  103 #if BYTE_ORDER == BIG_ENDIAN
  104     u_int16_t high;
  105     u_int64_t low;
  106 #else
  107     u_int64_t low;
  108     u_int16_t high;
  109 #endif
  110 } floatx80;
  111 #endif
  112 #ifdef FLOAT128
  113 typedef struct {
  114     u_int64_t high, low;
  115 } float128;
  116 #endif
  117 
  118 /*
  119  * Some of the global variables that used to be here have been removed for
  120  * fairly obvious (defopt-MULTIPROCESSOR) reasons.  The rest (which don't
  121  * change dynamically) will be removed later. [ross]
  122  */
  123 
  124 #define float_rounding_mode() fpgetround()
  125 
  126 /*
  127 -------------------------------------------------------------------------------
  128 Software IEC/IEEE floating-point underflow tininess-detection mode.
  129 -------------------------------------------------------------------------------
  130 */
  131 
  132 extern int float_detect_tininess;
  133 enum {
  134     float_tininess_after_rounding  = 1,
  135     float_tininess_before_rounding = 0
  136 };
  137 
  138 /*
  139 -------------------------------------------------------------------------------
  140 Software IEC/IEEE floating-point rounding mode.
  141 -------------------------------------------------------------------------------
  142 */
  143 
  144 enum {
  145     float_round_nearest_even = FP_RN,
  146     float_round_to_zero      = FP_RZ,
  147     float_round_down         = FP_RM,
  148     float_round_up           = FP_RP
  149 };
  150 
  151 /*
  152 -------------------------------------------------------------------------------
  153 Software IEC/IEEE floating-point exception flags.
  154 -------------------------------------------------------------------------------
  155 */
  156 
  157 enum {
  158     float_flag_inexact   =  FP_X_IMP,
  159     float_flag_underflow =  FP_X_UFL,
  160     float_flag_overflow  =  FP_X_OFL,
  161     float_flag_divbyzero =  FP_X_DZ,
  162     float_flag_invalid   =  FP_X_INV
  163 };
  164 
  165 /*
  166 -------------------------------------------------------------------------------
  167 Software IEC/IEEE integer-to-floating-point conversion routines.
  168 -------------------------------------------------------------------------------
  169 */
  170 float32 int32_to_float32( int );
  171 float64 int32_to_float64( int );
  172 #ifdef FLOATX80
  173 floatx80 int32_to_floatx80( int );
  174 #endif
  175 #ifdef FLOAT128
  176 float128 int32_to_float128( int );
  177 #endif
  178 #ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */
  179 float32 int64_to_float32( int64_t );
  180 float64 int64_to_float64( int64_t );
  181 #ifdef FLOATX80
  182 floatx80 int64_to_floatx80( int64_t );
  183 #endif
  184 #ifdef FLOAT128
  185 float128 int64_to_float128( int64_t );
  186 #endif
  187 #endif
  188 
  189 /*
  190 -------------------------------------------------------------------------------
  191 Software IEC/IEEE single-precision conversion routines.
  192 -------------------------------------------------------------------------------
  193 */
  194 int float32_to_int32( float32 );
  195 int float32_to_int32_round_to_zero( float32 );
  196 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
  197 int64_t float32_to_int64( float32 );
  198 int64_t float32_to_int64_round_to_zero( float32 );
  199 #endif
  200 float64 float32_to_float64( float32 );
  201 #ifdef FLOATX80
  202 floatx80 float32_to_floatx80( float32 );
  203 #endif
  204 #ifdef FLOAT128
  205 float128 float32_to_float128( float32 );
  206 #endif
  207 
  208 /*
  209 -------------------------------------------------------------------------------
  210 Software IEC/IEEE single-precision operations.
  211 -------------------------------------------------------------------------------
  212 */
  213 float32 float32_round_to_int( float32 );
  214 float32 float32_add( float32, float32 );
  215 float32 float32_sub( float32, float32 );
  216 float32 float32_mul( float32, float32 );
  217 float32 float32_div( float32, float32 );
  218 float32 float32_rem( float32, float32 );
  219 float32 float32_sqrt( float32 );
  220 int float32_eq( float32, float32 );
  221 int float32_le( float32, float32 );
  222 int float32_lt( float32, float32 );
  223 int float32_eq_signaling( float32, float32 );
  224 int float32_le_quiet( float32, float32 );
  225 int float32_lt_quiet( float32, float32 );
  226 #ifndef SOFTFLOAT_FOR_GCC
  227 int float32_is_signaling_nan( float32 );
  228 #endif
  229 
  230 /*
  231 -------------------------------------------------------------------------------
  232 Software IEC/IEEE double-precision conversion routines.
  233 -------------------------------------------------------------------------------
  234 */
  235 int float64_to_int32( float64 );
  236 int float64_to_int32_round_to_zero( float64 );
  237 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
  238 int64_t float64_to_int64( float64 );
  239 int64_t float64_to_int64_round_to_zero( float64 );
  240 #endif
  241 float32 float64_to_float32( float64 );
  242 #ifdef FLOATX80
  243 floatx80 float64_to_floatx80( float64 );
  244 #endif
  245 #ifdef FLOAT128
  246 float128 float64_to_float128( float64 );
  247 #endif
  248 
  249 /*
  250 -------------------------------------------------------------------------------
  251 Software IEC/IEEE double-precision operations.
  252 -------------------------------------------------------------------------------
  253 */
  254 #define float64_default_nan 0xFFF8000000000000LL
  255 
  256 static __inline int
  257 float64_is_nan(float64 a)
  258 {
  259         return 0xFFE0000000000000LL < a << 1;
  260 }
  261 
  262 static __inline int
  263 float64_is_signaling_nan(float64 a)
  264 {
  265         return (a >> 51 & 0xFFF) == 0xFFE && (a & 0x0007FFFFFFFFFFFFLL);
  266 }
  267 
  268 float64 float64_round_to_int( float64 );
  269 float64 float64_add( float64, float64 );
  270 float64 float64_sub( float64, float64 );
  271 float64 float64_mul( float64, float64 );
  272 float64 float64_div( float64, float64 );
  273 float64 float64_rem( float64, float64 );
  274 float64 float64_sqrt( float64 );
  275 int float64_eq( float64, float64 );
  276 int float64_le( float64, float64 );
  277 int float64_lt( float64, float64 );
  278 int float64_eq_signaling( float64, float64 );
  279 int float64_le_quiet( float64, float64 );
  280 int float64_lt_quiet( float64, float64 );
  281 #ifndef SOFTFLOAT_FOR_GCC
  282 int float64_is_signaling_nan( float64 );
  283 #endif
  284 
  285 #ifdef FLOATX80
  286 
  287 /*
  288 -------------------------------------------------------------------------------
  289 Software IEC/IEEE extended double-precision conversion routines.
  290 -------------------------------------------------------------------------------
  291 */
  292 int floatx80_to_int32( floatx80 );
  293 int floatx80_to_int32_round_to_zero( floatx80 );
  294 int64_t floatx80_to_int64( floatx80 );
  295 int64_t floatx80_to_int64_round_to_zero( floatx80 );
  296 float32 floatx80_to_float32( floatx80 );
  297 float64 floatx80_to_float64( floatx80 );
  298 #ifdef FLOAT128
  299 float128 floatx80_to_float128( floatx80 );
  300 #endif
  301 
  302 /*
  303 -------------------------------------------------------------------------------
  304 Software IEC/IEEE extended double-precision rounding precision.  Valid
  305 values are 32, 64, and 80.
  306 -------------------------------------------------------------------------------
  307 */
  308 extern int floatx80_rounding_precision;
  309 
  310 /*
  311 -------------------------------------------------------------------------------
  312 Software IEC/IEEE extended double-precision operations.
  313 -------------------------------------------------------------------------------
  314 */
  315 floatx80 floatx80_round_to_int( floatx80 );
  316 floatx80 floatx80_add( floatx80, floatx80 );
  317 floatx80 floatx80_sub( floatx80, floatx80 );
  318 floatx80 floatx80_mul( floatx80, floatx80 );
  319 floatx80 floatx80_div( floatx80, floatx80 );
  320 floatx80 floatx80_rem( floatx80, floatx80 );
  321 floatx80 floatx80_sqrt( floatx80 );
  322 int floatx80_eq( floatx80, floatx80 );
  323 int floatx80_le( floatx80, floatx80 );
  324 int floatx80_lt( floatx80, floatx80 );
  325 int floatx80_eq_signaling( floatx80, floatx80 );
  326 int floatx80_le_quiet( floatx80, floatx80 );
  327 int floatx80_lt_quiet( floatx80, floatx80 );
  328 int floatx80_is_signaling_nan( floatx80 );
  329 
  330 #endif
  331 
  332 #ifdef FLOAT128
  333 
  334 /*
  335 -------------------------------------------------------------------------------
  336 Software IEC/IEEE quadruple-precision conversion routines.
  337 -------------------------------------------------------------------------------
  338 */
  339 int float128_to_int32( float128 );
  340 int float128_to_int32_round_to_zero( float128 );
  341 int64_t float128_to_int64( float128 );
  342 int64_t float128_to_int64_round_to_zero( float128 );
  343 float32 float128_to_float32( float128 );
  344 float64 float128_to_float64( float128 );
  345 #ifdef FLOATX80
  346 floatx80 float128_to_floatx80( float128 );
  347 #endif
  348 
  349 /*
  350 -------------------------------------------------------------------------------
  351 Software IEC/IEEE quadruple-precision operations.
  352 -------------------------------------------------------------------------------
  353 */
  354 float128 float128_round_to_int( float128 );
  355 float128 float128_add( float128, float128 );
  356 float128 float128_sub( float128, float128 );
  357 float128 float128_mul( float128, float128 );
  358 float128 float128_div( float128, float128 );
  359 float128 float128_rem( float128, float128 );
  360 float128 float128_sqrt( float128 );
  361 int float128_eq( float128, float128 );
  362 int float128_le( float128, float128 );
  363 int float128_lt( float128, float128 );
  364 int float128_eq_signaling( float128, float128 );
  365 int float128_le_quiet( float128, float128 );
  366 int float128_lt_quiet( float128, float128 );
  367 int float128_is_signaling_nan( float128 );
  368 
  369 #endif
  370 

Cache object: b736a76e242584eb9305605da6a771a8


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.