arch/mips/math-emu/ieee754sp.h

   1 /*
   2  * IEEE754 floating point
   3  * double precision internal header file
   4  */
   5 /*
   6  * MIPS floating point support
   7  * Copyright (C) 1994-2000 Algorithmics Ltd.
   8  *
   9  * ########################################################################
  10  *
  11  *  This program is free software; you can distribute it and/or modify it
  12  *  under the terms of the GNU General Public License (Version 2) as
  13  *  published by the Free Software Foundation.
  14  *
  15  *  This program is distributed in the hope it will be useful, but WITHOUT
  16  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18  *  for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  23  *
  24  * ########################################################################
  25  */
  26
  27 #include <linux/compiler.h>
  28
  29 #include "ieee754int.h"
  30
  31 #define assert(expr) ((void)0)
  32
  33 /* 3bit extended single precision sticky right shift */
  34 #define SPXSRSXn(rs)                                                    \
  35         (xe += rs,                                                      \
  36          xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
  37
  38 #define SPXSRSX1() \
  39         (xe++, (xm = (xm >> 1) | (xm & 1)))
  40
  41 #define SPXSRSYn(rs)                                                            \
  42         (ye+=rs,                                                                \
  43          ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
  44
  45 #define SPXSRSY1() \
  46         (ye++, (ym = (ym >> 1) | (ym & 1)))
  47
  48 /* convert denormal to normalized with extended exponent */
  49 #define SPDNORMx(m,e) \
  50         while ((m >> SP_MBITS) == 0) { m <<= 1; e--; }
  51 #define SPDNORMX        SPDNORMx(xm, xe)
  52 #define SPDNORMY        SPDNORMx(ym, ye)
  53
  54 static inline union ieee754sp buildsp(int s, int bx, unsigned m)
  55 {
  56         union ieee754sp r;
  57
  58         assert((s) == 0 || (s) == 1);
  59         assert((bx) >= SP_EMIN - 1 + SP_EBIAS
  60                && (bx) <= SP_EMAX + 1 + SP_EBIAS);
  61         assert(((m) >> SP_MBITS) == 0);
  62
  63         r.parts.sign = s;
  64         r.parts.bexp = bx;
  65         r.parts.mant = m;
  66
  67         return r;
  68 }
  69
  70 extern int ieee754sp_isnan(union ieee754sp);
  71 extern int ieee754sp_issnan(union ieee754sp);
  72 extern int __cold ieee754si_xcpt(int, const char *, ...);
  73 extern s64 __cold ieee754di_xcpt(s64, const char *, ...);
  74 extern union ieee754sp __cold ieee754sp_xcpt(union ieee754sp, const char *, ...);
  75 extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp, const char *, ...);
  76 extern union ieee754sp ieee754sp_bestnan(union ieee754sp, union ieee754sp);
  77 extern union ieee754sp ieee754sp_format(int, int, unsigned);
  78
  79
  80 #define SPNORMRET2(s, e, m, name, a0, a1)                               \
  81 {                                                                       \
  82         union ieee754sp V = ieee754sp_format(s, e, m);                  \
  83                                                                         \
  84         if (TSTX())                                                     \
  85                 return ieee754sp_xcpt(V, name, a0, a1);                 \
  86         else                                                            \
  87                 return V;                                               \
  88 }
  89
  90 #define SPNORMRET1(s, e, m, name, a0)  SPNORMRET2(s, e, m, name, a0, a0)