arch/mips/math-emu/ieee754.c

   1 /* ieee754 floating point arithmetic
   2  * single and double precision
   3  *
   4  * BUGS
   5  * not much dp done
   6  * doesn't generate IEEE754_INEXACT
   7  *
   8  */
   9 /*
  10  * MIPS floating point support
  11  * Copyright (C) 1994-2000 Algorithmics Ltd.
  12  *
  13  *  This program is free software; you can distribute it and/or modify it
  14  *  under the terms of the GNU General Public License (Version 2) as
  15  *  published by the Free Software Foundation.
  16  *
  17  *  This program is distributed in the hope it will be useful, but WITHOUT
  18  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  *  for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
  25  */
  26
  27 #include <linux/compiler.h>
  28
  29 #include "ieee754.h"
  30 #include "ieee754sp.h"
  31 #include "ieee754dp.h"
  32
  33 /*
  34  * Special constants
  35  */
  36
  37 /*
  38  * Older GCC requires the inner braces for initialization of union ieee754dp's
  39  * anonymous struct member.  Without an error will result.
  40  */
  41 #define xPCNST(s, b, m, ebias)                                          \
  42 {                                                                       \
  43         {                                                               \
  44                 .sign   = (s),                                          \
  45                 .bexp   = (b) + ebias,                                  \
  46                 .mant   = (m)                                           \
  47         }                                                               \
  48 }
  49
  50 #define DPCNST(s, b, m)                                                 \
  51         xPCNST(s, b, m, DP_EBIAS)
  52
  53 const union ieee754dp __ieee754dp_spcvals[] = {
  54         DPCNST(0, DP_EMIN - 1, 0x0000000000000ULL),     /* + zero   */
  55         DPCNST(1, DP_EMIN - 1, 0x0000000000000ULL),     /* - zero   */
  56         DPCNST(0, 0,           0x0000000000000ULL),     /* + 1.0   */
  57         DPCNST(1, 0,           0x0000000000000ULL),     /* - 1.0   */
  58         DPCNST(0, 3,           0x4000000000000ULL),     /* + 10.0   */
  59         DPCNST(1, 3,           0x4000000000000ULL),     /* - 10.0   */
  60         DPCNST(0, DP_EMAX + 1, 0x0000000000000ULL),     /* + infinity */
  61         DPCNST(1, DP_EMAX + 1, 0x0000000000000ULL),     /* - infinity */
  62         DPCNST(0, DP_EMAX + 1, 0x7FFFFFFFFFFFFULL),     /* + indef quiet Nan */
  63         DPCNST(0, DP_EMAX,     0xFFFFFFFFFFFFFULL),     /* + max */
  64         DPCNST(1, DP_EMAX,     0xFFFFFFFFFFFFFULL),     /* - max */
  65         DPCNST(0, DP_EMIN,     0x0000000000000ULL),     /* + min normal */
  66         DPCNST(1, DP_EMIN,     0x0000000000000ULL),     /* - min normal */
  67         DPCNST(0, DP_EMIN - 1, 0x0000000000001ULL),     /* + min denormal */
  68         DPCNST(1, DP_EMIN - 1, 0x0000000000001ULL),     /* - min denormal */
  69         DPCNST(0, 31,          0x0000000000000ULL),     /* + 1.0e31 */
  70         DPCNST(0, 63,          0x0000000000000ULL),     /* + 1.0e63 */
  71 };
  72
  73 #define SPCNST(s, b, m)                                                 \
  74         xPCNST(s, b, m, SP_EBIAS)
  75
  76 const union ieee754sp __ieee754sp_spcvals[] = {
  77         SPCNST(0, SP_EMIN - 1, 0x000000),       /* + zero   */
  78         SPCNST(1, SP_EMIN - 1, 0x000000),       /* - zero   */
  79         SPCNST(0, 0,           0x000000),       /* + 1.0   */
  80         SPCNST(1, 0,           0x000000),       /* - 1.0   */
  81         SPCNST(0, 3,           0x200000),       /* + 10.0   */
  82         SPCNST(1, 3,           0x200000),       /* - 10.0   */
  83         SPCNST(0, SP_EMAX + 1, 0x000000),       /* + infinity */
  84         SPCNST(1, SP_EMAX + 1, 0x000000),       /* - infinity */
  85         SPCNST(0, SP_EMAX + 1, 0x3FFFFF),       /* + indef quiet Nan  */
  86         SPCNST(0, SP_EMAX,     0x7FFFFF),       /* + max normal */
  87         SPCNST(1, SP_EMAX,     0x7FFFFF),       /* - max normal */
  88         SPCNST(0, SP_EMIN,     0x000000),       /* + min normal */
  89         SPCNST(1, SP_EMIN,     0x000000),       /* - min normal */
  90         SPCNST(0, SP_EMIN - 1, 0x000001),       /* + min denormal */
  91         SPCNST(1, SP_EMIN - 1, 0x000001),       /* - min denormal */
  92         SPCNST(0, 31,          0x000000),       /* + 1.0e31 */
  93         SPCNST(0, 63,          0x000000),       /* + 1.0e63 */
  94 };