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 COMPZSP \
  59         unsigned zm; int ze; int zs; int zc
  60
  61 #define EXPLODESP(v, vc, vs, ve, vm)                                    \
  62 {                                                                       \
  63         vs = SPSIGN(v);                                                 \
  64         ve = SPBEXP(v);                                                 \
  65         vm = SPMANT(v);                                                 \
  66         if (ve == SP_EMAX+1+SP_EBIAS) {                                 \
  67                 if (vm == 0)                                            \
  68                         vc = IEEE754_CLASS_INF;                         \
  69                 else if (ieee754_csr.nan2008 ^ !(vm & SP_MBIT(SP_FBITS - 1))) \
  70                         vc = IEEE754_CLASS_QNAN;                        \
  71                 else                                                    \
  72                         vc = IEEE754_CLASS_SNAN;                        \
  73         } else if (ve == SP_EMIN-1+SP_EBIAS) {                          \
  74                 if (vm) {                                               \
  75                         ve = SP_EMIN;                                   \
  76                         vc = IEEE754_CLASS_DNORM;                       \
  77                 } else                                                  \
  78                         vc = IEEE754_CLASS_ZERO;                        \
  79         } else {                                                        \
  80                 ve -= SP_EBIAS;                                         \
  81                 vm |= SP_HIDDEN_BIT;                                    \
  82                 vc = IEEE754_CLASS_NORM;                                \
  83         }                                                               \
  84 }
  85 #define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
  86 #define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
  87 #define EXPLODEZSP EXPLODESP(z, zc, zs, ze, zm)
  88
  89
  90 #define COMPXDP \
  91         u64 xm; int xe; int xs __maybe_unused; int xc
  92
  93 #define COMPYDP \
  94         u64 ym; int ye; int ys; int yc
  95
  96 #define COMPZDP \
  97         u64 zm; int ze; int zs; int zc
  98
  99 #define EXPLODEDP(v, vc, vs, ve, vm)                                    \
 100 {                                                                       \
 101         vm = DPMANT(v);                                                 \
 102         vs = DPSIGN(v);                                                 \
 103         ve = DPBEXP(v);                                                 \
 104         if (ve == DP_EMAX+1+DP_EBIAS) {                                 \
 105                 if (vm == 0)                                            \
 106                         vc = IEEE754_CLASS_INF;                         \
 107                 else if (ieee754_csr.nan2008 ^ !(vm & DP_MBIT(DP_FBITS - 1))) \
 108                         vc = IEEE754_CLASS_QNAN;                        \
 109                 else                                                    \
 110                         vc = IEEE754_CLASS_SNAN;                        \
 111         } else if (ve == DP_EMIN-1+DP_EBIAS) {                          \
 112                 if (vm) {                                               \
 113                         ve = DP_EMIN;                                   \
 114                         vc = IEEE754_CLASS_DNORM;                       \
 115                 } else                                                  \
 116                         vc = IEEE754_CLASS_ZERO;                        \
 117         } else {                                                        \
 118                 ve -= DP_EBIAS;                                         \
 119                 vm |= DP_HIDDEN_BIT;                                    \
 120                 vc = IEEE754_CLASS_NORM;                                \
 121         }                                                               \
 122 }
 123 #define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
 124 #define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
 125 #define EXPLODEZDP EXPLODEDP(z, zc, zs, ze, zm)
 126
 127 #define FLUSHDP(v, vc, vs, ve, vm)                                      \
 128         if (vc==IEEE754_CLASS_DNORM) {                                  \
 129                 if (ieee754_csr.nod) {                                  \
 130                         ieee754_setcx(IEEE754_INEXACT);                 \
 131                         vc = IEEE754_CLASS_ZERO;                        \
 132                         ve = DP_EMIN-1+DP_EBIAS;                        \
 133                         vm = 0;                                         \
 134                         v = ieee754dp_zero(vs);                         \
 135                 }                                                       \
 136         }
 137
 138 #define FLUSHSP(v, vc, vs, ve, vm)                                      \
 139         if (vc==IEEE754_CLASS_DNORM) {                                  \
 140                 if (ieee754_csr.nod) {                                  \
 141                         ieee754_setcx(IEEE754_INEXACT);                 \
 142                         vc = IEEE754_CLASS_ZERO;                        \
 143                         ve = SP_EMIN-1+SP_EBIAS;                        \
 144                         vm = 0;                                         \
 145                         v = ieee754sp_zero(vs);                         \
 146                 }                                                       \
 147         }
 148
 149 #define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
 150 #define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
 151 #define FLUSHZDP FLUSHDP(z, zc, zs, ze, zm)
 152 #define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
 153 #define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)
 154 #define FLUSHZSP FLUSHSP(z, zc, zs, ze, zm)
 155
 156 #endif /* __IEEE754INT_H  */