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 #ifndef __IEEE754INT_H
  27 #define __IEEE754INT_H
  28
  29 #include "ieee754.h"
  30
  31 #define DP_EBIAS        1023
  32 #define DP_EMIN         (-1022)
  33 #define DP_EMAX         1023
  34 #define DP_FBITS        52
  35
  36 #define SP_EBIAS        127
  37 #define SP_EMIN         (-126)
  38 #define SP_EMAX         127
  39 #define SP_FBITS        23
  40
  41 #define DP_MBIT(x)      ((u64)1 << (x))
  42 #define DP_HIDDEN_BIT   DP_MBIT(DP_FBITS)
  43 #define DP_SIGN_BIT     DP_MBIT(63)
  44
  45 #define SP_MBIT(x)      ((u32)1 << (x))
  46 #define SP_HIDDEN_BIT   SP_MBIT(SP_FBITS)
  47 #define SP_SIGN_BIT     SP_MBIT(31)
  48
  49
  50 #define SPSIGN(sp)      (sp.parts.sign)
  51 #define SPBEXP(sp)      (sp.parts.bexp)
  52 #define SPMANT(sp)      (sp.parts.mant)
  53
  54 #define DPSIGN(dp)      (dp.parts.sign)
  55 #define DPBEXP(dp)      (dp.parts.bexp)
  56 #define DPMANT(dp)      (dp.parts.mant)
  57
  58 #define CLPAIR(x, y)    ((x)*6+(y))
  59
  60 static inline void ieee754_clearcx(void)
  61 {
  62         ieee754_csr.cx = 0;
  63 }
  64
  65 static inline void ieee754_setcx(const unsigned int flags)
  66 {
  67         ieee754_csr.cx |= flags;
  68         ieee754_csr.sx |= flags;
  69 }
  70
  71 static inline int ieee754_setandtestcx(const unsigned int x)
  72 {
  73         ieee754_setcx(x);
  74
  75         return ieee754_csr.mx & x;
  76 }
  77
  78 static inline int ieee754_tstx(void)
  79 {
  80         return ieee754_csr.cx & ieee754_csr.mx;
  81 }
  82
  83 #define COMPXSP \
  84         unsigned xm; int xe; int xs __maybe_unused; int xc
  85
  86 #define COMPYSP \
  87         unsigned ym; int ye; int ys; int yc
  88
  89 #define EXPLODESP(v, vc, vs, ve, vm)                                    \
  90 {                                                                       \
  91         vs = SPSIGN(v);                                                 \
  92         ve = SPBEXP(v);                                                 \
  93         vm = SPMANT(v);                                                 \
  94         if (ve == SP_EMAX+1+SP_EBIAS) {                                 \
  95                 if (vm == 0)                                            \
  96                         vc = IEEE754_CLASS_INF;                         \
  97                 else if (vm & SP_MBIT(SP_FBITS-1))                      \
  98                         vc = IEEE754_CLASS_SNAN;                        \
  99         else                                                            \
 100                 vc = IEEE754_CLASS_QNAN;                                \
 101         } else if (ve == SP_EMIN-1+SP_EBIAS) {                          \
 102                 if (vm) {                                               \
 103                         ve = SP_EMIN;                                   \
 104                         vc = IEEE754_CLASS_DNORM;                       \
 105                 } else                                                  \
 106                         vc = IEEE754_CLASS_ZERO;                        \
 107         } else {                                                        \
 108                 ve -= SP_EBIAS;                                         \
 109                 vm |= SP_HIDDEN_BIT;                                    \
 110                 vc = IEEE754_CLASS_NORM;                                \
 111         }                                                               \
 112 }
 113 #define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
 114 #define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
 115
 116
 117 #define COMPXDP \
 118         u64 xm; int xe; int xs __maybe_unused; int xc
 119
 120 #define COMPYDP \
 121         u64 ym; int ye; int ys; int yc
 122
 123 #define EXPLODEDP(v, vc, vs, ve, vm)                                    \
 124 {                                                                       \
 125         vm = DPMANT(v);                                                 \
 126         vs = DPSIGN(v);                                                 \
 127         ve = DPBEXP(v);                                                 \
 128         if (ve == DP_EMAX+1+DP_EBIAS) {                                 \
 129                 if (vm == 0)                                            \
 130                         vc = IEEE754_CLASS_INF;                         \
 131                 else if (vm & DP_MBIT(DP_FBITS-1))                      \
 132                         vc = IEEE754_CLASS_SNAN;                        \
 133                 else                                                    \
 134                         vc = IEEE754_CLASS_QNAN;                        \
 135         } else if (ve == DP_EMIN-1+DP_EBIAS) {                          \
 136                 if (vm) {                                               \
 137                         ve = DP_EMIN;                                   \
 138                         vc = IEEE754_CLASS_DNORM;                       \
 139         } else                                                          \
 140                 vc = IEEE754_CLASS_ZERO;                                \
 141         } else {                                                        \
 142                 ve -= DP_EBIAS;                                         \
 143                 vm |= DP_HIDDEN_BIT;                                    \
 144                 vc = IEEE754_CLASS_NORM;                                \
 145         }                                                               \
 146 }
 147 #define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
 148 #define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
 149
 150 #define FLUSHDP(v, vc, vs, ve, vm)                                      \
 151         if (vc==IEEE754_CLASS_DNORM) {                                  \
 152                 if (ieee754_csr.nod) {                                  \
 153                         ieee754_setcx(IEEE754_INEXACT);                 \
 154                         vc = IEEE754_CLASS_ZERO;                        \
 155                         ve = DP_EMIN-1+DP_EBIAS;                        \
 156                         vm = 0;                                         \
 157                         v = ieee754dp_zero(vs);                         \
 158                 }                                                       \
 159         }
 160
 161 #define FLUSHSP(v, vc, vs, ve, vm)                                      \
 162         if (vc==IEEE754_CLASS_DNORM) {                                  \
 163                 if (ieee754_csr.nod) {                                  \
 164                         ieee754_setcx(IEEE754_INEXACT);                 \
 165                         vc = IEEE754_CLASS_ZERO;                        \
 166                         ve = SP_EMIN-1+SP_EBIAS;                        \
 167                         vm = 0;                                         \
 168                         v = ieee754sp_zero(vs);                         \
 169                 }                                                       \
 170         }
 171
 172 #define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
 173 #define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
 174 #define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
 175 #define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)
 176
 177 #endif /* __IEEE754INT_H  */