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 #define COMPXSP \
  48         unsigned xm; int xe; int xs __maybe_unused; int xc
  49
  50 #define COMPYSP \
  51         unsigned ym; int ye; int ys; int yc
  52
  53 #define EXPLODESP(v, vc, vs, ve, vm)                                    \
  54 {                                                                       \
  55         vs = SPSIGN(v);                                                 \
  56         ve = SPBEXP(v);                                                 \
  57         vm = SPMANT(v);                                                 \
  58         if (ve == SP_EMAX+1+SP_EBIAS) {                                 \
  59                 if (vm == 0)                                            \
  60                         vc = IEEE754_CLASS_INF;                         \
  61                 else if (vm & SP_MBIT(SP_FBITS-1))                      \
  62                         vc = IEEE754_CLASS_SNAN;                        \
  63         else                                                            \
  64                 vc = IEEE754_CLASS_QNAN;                                \
  65         } else if (ve == SP_EMIN-1+SP_EBIAS) {                          \
  66                 if (vm) {                                               \
  67                         ve = SP_EMIN;                                   \
  68                         vc = IEEE754_CLASS_DNORM;                       \
  69                 } else                                                  \
  70                         vc = IEEE754_CLASS_ZERO;                        \
  71         } else {                                                        \
  72                 ve -= SP_EBIAS;                                         \
  73                 vm |= SP_HIDDEN_BIT;                                    \
  74                 vc = IEEE754_CLASS_NORM;                                \
  75         }                                                               \
  76 }
  77 #define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
  78 #define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
  79
  80
  81 #define COMPXDP \
  82         u64 xm; int xe; int xs __maybe_unused; int xc
  83
  84 #define COMPYDP \
  85         u64 ym; int ye; int ys; int yc
  86
  87 #define EXPLODEDP(v, vc, vs, ve, vm)                                    \
  88 {                                                                       \
  89         vm = DPMANT(v);                                                 \
  90         vs = DPSIGN(v);                                                 \
  91         ve = DPBEXP(v);                                                 \
  92         if (ve == DP_EMAX+1+DP_EBIAS) {                                 \
  93                 if (vm == 0)                                            \
  94                         vc = IEEE754_CLASS_INF;                         \
  95                 else if (vm & DP_MBIT(DP_FBITS-1))                      \
  96                         vc = IEEE754_CLASS_SNAN;                        \
  97                 else                                                    \
  98                         vc = IEEE754_CLASS_QNAN;                        \
  99         } else if (ve == DP_EMIN-1+DP_EBIAS) {                          \
 100                 if (vm) {                                               \
 101                         ve = DP_EMIN;                                   \
 102                         vc = IEEE754_CLASS_DNORM;                       \
 103         } else                                                          \
 104                 vc = IEEE754_CLASS_ZERO;                                \
 105         } else {                                                        \
 106                 ve -= DP_EBIAS;                                         \
 107                 vm |= DP_HIDDEN_BIT;                                    \
 108                 vc = IEEE754_CLASS_NORM;                                \
 109         }                                                               \
 110 }
 111 #define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
 112 #define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
 113
 114 #define FLUSHDP(v, vc, vs, ve, vm)                                      \
 115         if (vc==IEEE754_CLASS_DNORM) {                                  \
 116                 if (ieee754_csr.nod) {                                  \
 117                         ieee754_setcx(IEEE754_INEXACT);                 \
 118                         vc = IEEE754_CLASS_ZERO;                        \
 119                         ve = DP_EMIN-1+DP_EBIAS;                        \
 120                         vm = 0;                                         \
 121                         v = ieee754dp_zero(vs);                         \
 122                 }                                                       \
 123         }
 124
 125 #define FLUSHSP(v, vc, vs, ve, vm)                                      \
 126         if (vc==IEEE754_CLASS_DNORM) {                                  \
 127                 if (ieee754_csr.nod) {                                  \
 128                         ieee754_setcx(IEEE754_INEXACT);                 \
 129                         vc = IEEE754_CLASS_ZERO;                        \
 130                         ve = SP_EMIN-1+SP_EBIAS;                        \
 131                         vm = 0;                                         \
 132                         v = ieee754sp_zero(vs);                         \
 133                 }                                                       \
 134         }
 135
 136 #define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
 137 #define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
 138 #define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
 139 #define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)
 140
 141 #endif /* __IEEE754INT_H  */