kernel/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  *  This program is free software; you can distribute it and/or modify it
  10  *  under the terms of the GNU General Public License (Version 2) as
  11  *  published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope it will be useful, but WITHOUT
  14  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  *  for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
  21  */
  22 #ifndef __IEEE754INT_H
  23 #define __IEEE754INT_H
  24
  25 #include "ieee754.h"
  26
  27 #define CLPAIR(x, y)    ((x)*6+(y))
  28
  29 static inline void ieee754_clearcx(void)
  30 {
  31         ieee754_csr.cx = 0;
  32 }
  33
  34 static inline void ieee754_setcx(const unsigned int flags)
  35 {
  36         ieee754_csr.cx |= flags;
  37         ieee754_csr.sx |= flags;
  38 }
  39
  40 static inline int ieee754_setandtestcx(const unsigned int x)
  41 {
  42         ieee754_setcx(x);
  43
  44         return ieee754_csr.mx & x;
  45 }
  46
  47 static inline int ieee754_class_nan(int xc)
  48 {
  49         return xc >= IEEE754_CLASS_SNAN;
  50 }
  51
  52 #define COMPXSP \
  53         unsigned xm; int xe; int xs __maybe_unused; int xc
  54
  55 #define COMPYSP \
  56         unsigned ym; int ye; int ys; int yc
  57
  58 #define EXPLODESP(v, vc, vs, ve, vm)                                    \
  59 {                                                                       \
  60         vs = SPSIGN(v);                                                 \
  61         ve = SPBEXP(v);                                                 \
  62         vm = SPMANT(v);                                                 \
  63         if (ve == SP_EMAX+1+SP_EBIAS) {                                 \
  64                 if (vm == 0)                                            \
  65                         vc = IEEE754_CLASS_INF;                         \
  66                 else if (vm & SP_MBIT(SP_FBITS-1))                      \
  67                         vc = IEEE754_CLASS_SNAN;                        \
  68         else                                                            \
  69                 vc = IEEE754_CLASS_QNAN;                                \
  70         } else if (ve == SP_EMIN-1+SP_EBIAS) {                          \
  71                 if (vm) {                                               \
  72                         ve = SP_EMIN;                                   \
  73                         vc = IEEE754_CLASS_DNORM;                       \
  74                 } else                                                  \
  75                         vc = IEEE754_CLASS_ZERO;                        \
  76         } else {                                                        \
  77                 ve -= SP_EBIAS;                                         \
  78                 vm |= SP_HIDDEN_BIT;                                    \
  79                 vc = IEEE754_CLASS_NORM;                                \
  80         }                                                               \
  81 }
  82 #define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
  83 #define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
  84
  85
  86 #define COMPXDP \
  87         u64 xm; int xe; int xs __maybe_unused; int xc
  88
  89 #define COMPYDP \
  90         u64 ym; int ye; int ys; int yc
  91
  92 #define EXPLODEDP(v, vc, vs, ve, vm)                                    \
  93 {                                                                       \
  94         vm = DPMANT(v);                                                 \
  95         vs = DPSIGN(v);                                                 \
  96         ve = DPBEXP(v);                                                 \
  97         if (ve == DP_EMAX+1+DP_EBIAS) {                                 \
  98                 if (vm == 0)                                            \
  99                         vc = IEEE754_CLASS_INF;                         \
 100                 else if (vm & DP_MBIT(DP_FBITS-1))                      \
 101                         vc = IEEE754_CLASS_SNAN;                        \
 102                 else                                                    \
 103                         vc = IEEE754_CLASS_QNAN;                        \
 104         } else if (ve == DP_EMIN-1+DP_EBIAS) {                          \
 105                 if (vm) {                                               \
 106                         ve = DP_EMIN;                                   \
 107                         vc = IEEE754_CLASS_DNORM;                       \
 108         } else                                                          \
 109                 vc = IEEE754_CLASS_ZERO;                                \
 110         } else {                                                        \
 111                 ve -= DP_EBIAS;                                         \
 112                 vm |= DP_HIDDEN_BIT;                                    \
 113                 vc = IEEE754_CLASS_NORM;                                \
 114         }                                                               \
 115 }
 116 #define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
 117 #define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
 118
 119 #define FLUSHDP(v, vc, vs, ve, vm)                                      \
 120         if (vc==IEEE754_CLASS_DNORM) {                                  \
 121                 if (ieee754_csr.nod) {                                  \
 122                         ieee754_setcx(IEEE754_INEXACT);                 \
 123                         vc = IEEE754_CLASS_ZERO;                        \
 124                         ve = DP_EMIN-1+DP_EBIAS;                        \
 125                         vm = 0;                                         \
 126                         v = ieee754dp_zero(vs);                         \
 127                 }                                                       \
 128         }
 129
 130 #define FLUSHSP(v, vc, vs, ve, vm)                                      \
 131         if (vc==IEEE754_CLASS_DNORM) {                                  \
 132                 if (ieee754_csr.nod) {                                  \
 133                         ieee754_setcx(IEEE754_INEXACT);                 \
 134                         vc = IEEE754_CLASS_ZERO;                        \
 135                         ve = SP_EMIN-1+SP_EBIAS;                        \
 136                         vm = 0;                                         \
 137                         v = ieee754sp_zero(vs);                         \
 138                 }                                                       \
 139         }
 140
 141 #define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
 142 #define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
 143 #define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
 144 #define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)
 145
 146 #endif /* __IEEE754INT_H  */