arch/mips/math-emu/ieee754int.h

   1 /*
   2  * IEEE754 floating point
   3  * common 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
  28 #include "ieee754.h"
  29
  30 #define DP_EBIAS        1023
  31 #define DP_EMIN         (-1022)
  32 #define DP_EMAX         1023
  33 #define DP_MBITS        52
  34
  35 #define SP_EBIAS        127
  36 #define SP_EMIN         (-126)
  37 #define SP_EMAX         127
  38 #define SP_MBITS        23
  39
  40 #define DP_MBIT(x)      ((u64)1 << (x))
  41 #define DP_HIDDEN_BIT   DP_MBIT(DP_MBITS)
  42 #define DP_SIGN_BIT     DP_MBIT(63)
  43
  44 #define SP_MBIT(x)      ((u32)1 << (x))
  45 #define SP_HIDDEN_BIT   SP_MBIT(SP_MBITS)
  46 #define SP_SIGN_BIT     SP_MBIT(31)
  47
  48
  49 #define SPSIGN(sp)      (sp.parts.sign)
  50 #define SPBEXP(sp)      (sp.parts.bexp)
  51 #define SPMANT(sp)      (sp.parts.mant)
  52
  53 #define DPSIGN(dp)      (dp.parts.sign)
  54 #define DPBEXP(dp)      (dp.parts.bexp)
  55 #define DPMANT(dp)      (dp.parts.mant)
  56
  57 #define CLPAIR(x, y)    ((x)*6+(y))
  58
  59 #define CLEARCX \
  60         (ieee754_csr.cx = 0)
  61
  62 #define SETCX(x) \
  63         (ieee754_csr.cx |= (x), ieee754_csr.sx |= (x))
  64
  65 #define SETANDTESTCX(x) \
  66         (SETCX(x), ieee754_csr.mx & (x))
  67
  68 #define TSTX()  \
  69         (ieee754_csr.cx & ieee754_csr.mx)
  70
  71
  72 #define COMPXSP \
  73         unsigned xm; int xe; int xs __maybe_unused; int xc
  74
  75 #define COMPYSP \
  76         unsigned ym; int ye; int ys; int yc
  77
  78 #define EXPLODESP(v, vc, vs, ve, vm)                                    \
  79 {                                                                       \
  80         vs = SPSIGN(v);                                                 \
  81         ve = SPBEXP(v);                                                 \
  82         vm = SPMANT(v);                                                 \
  83         if (ve == SP_EMAX+1+SP_EBIAS) {                                 \
  84                 if (vm == 0)                                            \
  85                         vc = IEEE754_CLASS_INF;                         \
  86                 else if (vm & SP_MBIT(SP_MBITS-1))                      \
  87                         vc = IEEE754_CLASS_SNAN;                        \
  88         else                                                            \
  89                 vc = IEEE754_CLASS_QNAN;                                \
  90         } else if (ve == SP_EMIN-1+SP_EBIAS) {                          \
  91                 if (vm) {                                               \
  92                         ve = SP_EMIN;                                   \
  93                         vc = IEEE754_CLASS_DNORM;                       \
  94                 } else                                                  \
  95                         vc = IEEE754_CLASS_ZERO;                        \
  96         } else {                                                        \
  97                 ve -= SP_EBIAS;                                         \
  98                 vm |= SP_HIDDEN_BIT;                                    \
  99                 vc = IEEE754_CLASS_NORM;                                \
 100         }                                                               \
 101 }
 102 #define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
 103 #define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
 104
 105
 106 #define COMPXDP \
 107         u64 xm; int xe; int xs __maybe_unused; int xc
 108
 109 #define COMPYDP \
 110         u64 ym; int ye; int ys; int yc
 111
 112 #define EXPLODEDP(v, vc, vs, ve, vm)                                    \
 113 {                                                                       \
 114         vm = DPMANT(v);                                                 \
 115         vs = DPSIGN(v);                                                 \
 116         ve = DPBEXP(v);                                                 \
 117         if (ve == DP_EMAX+1+DP_EBIAS) {                                 \
 118                 if (vm == 0)                                            \
 119                         vc = IEEE754_CLASS_INF;                         \
 120                 else if (vm & DP_MBIT(DP_MBITS-1))                      \
 121                         vc = IEEE754_CLASS_SNAN;                        \
 122                 else                                                    \
 123                         vc = IEEE754_CLASS_QNAN;                        \
 124         } else if (ve == DP_EMIN-1+DP_EBIAS) {                          \
 125                 if (vm) {                                               \
 126                         ve = DP_EMIN;                                   \
 127                         vc = IEEE754_CLASS_DNORM;                       \
 128         } else                                                          \
 129                 vc = IEEE754_CLASS_ZERO;                                \
 130         } else {                                                        \
 131                 ve -= DP_EBIAS;                                         \
 132                 vm |= DP_HIDDEN_BIT;                                    \
 133                 vc = IEEE754_CLASS_NORM;                                \
 134         }                                                               \
 135 }
 136 #define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
 137 #define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
 138
 139 #define FLUSHDP(v, vc, vs, ve, vm)                                      \
 140         if (vc==IEEE754_CLASS_DNORM) {                                  \
 141                 if (ieee754_csr.nod) {                                  \
 142                         SETCX(IEEE754_INEXACT);                         \
 143                         vc = IEEE754_CLASS_ZERO;                        \
 144                         ve = DP_EMIN-1+DP_EBIAS;                        \
 145                         vm = 0;                                         \
 146                         v = ieee754dp_zero(vs);                         \
 147                 }                                                       \
 148         }
 149
 150 #define FLUSHSP(v, vc, vs, ve, vm)                                      \
 151         if (vc==IEEE754_CLASS_DNORM) {                                  \
 152                 if (ieee754_csr.nod) {                                  \
 153                         SETCX(IEEE754_INEXACT);                         \
 154                         vc = IEEE754_CLASS_ZERO;                        \
 155                         ve = SP_EMIN-1+SP_EBIAS;                        \
 156                         vm = 0;                                         \
 157                         v = ieee754sp_zero(vs);                         \
 158                 }                                                       \
 159         }
 160
 161 #define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
 162 #define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
 163 #define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
 164 #define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)