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  * http://www.algor.co.uk
   9  *
  10  * ########################################################################
  11  *
  12  *  This program is free software; you can distribute it and/or modify it
  13  *  under the terms of the GNU General Public License (Version 2) as
  14  *  published by the Free Software Foundation.
  15  *
  16  *  This program is distributed in the hope it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with this program; if not, write to the Free Software Foundation, Inc.,
  23  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  24  *
  25  * ########################################################################
  26  */
  27
  28
  29 #include "ieee754.h"
  30
  31 #define DP_EBIAS        1023
  32 #define DP_EMIN         (-1022)
  33 #define DP_EMAX         1023
  34 #define DP_MBITS        52
  35
  36 #define SP_EBIAS        127
  37 #define SP_EMIN         (-126)
  38 #define SP_EMAX         127
  39 #define SP_MBITS        23
  40
  41 #define DP_MBIT(x)      ((u64)1 << (x))
  42 #define DP_HIDDEN_BIT   DP_MBIT(DP_MBITS)
  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_MBITS)
  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 #define CLEARCX \
  61   (ieee754_csr.cx = 0)
  62
  63 #define SETCX(x) \
  64   (ieee754_csr.cx |= (x), ieee754_csr.sx |= (x))
  65
  66 #define SETANDTESTCX(x) \
  67   (SETCX(x), ieee754_csr.mx & (x))
  68
  69 #define TSTX()  \
  70         (ieee754_csr.cx & ieee754_csr.mx)
  71
  72
  73 #define COMPXSP \
  74   unsigned xm; int xe; int xs; int xc
  75
  76 #define COMPYSP \
  77   unsigned ym; int ye; int ys; int yc
  78
  79 #define EXPLODESP(v, vc, vs, ve, vm) \
  80 {\
  81     vs = SPSIGN(v);\
  82     ve = SPBEXP(v);\
  83     vm = SPMANT(v);\
  84     if(ve == SP_EMAX+1+SP_EBIAS){\
  85         if(vm == 0)\
  86           vc = IEEE754_CLASS_INF;\
  87         else if(vm & SP_MBIT(SP_MBITS-1)) \
  88           vc = IEEE754_CLASS_SNAN;\
  89         else \
  90           vc = IEEE754_CLASS_QNAN;\
  91     } else if(ve == SP_EMIN-1+SP_EBIAS) {\
  92         if(vm) {\
  93             ve = SP_EMIN;\
  94             vc = IEEE754_CLASS_DNORM;\
  95         } else\
  96           vc = IEEE754_CLASS_ZERO;\
  97     } else {\
  98         ve -= SP_EBIAS;\
  99         vm |= SP_HIDDEN_BIT;\
 100         vc = IEEE754_CLASS_NORM;\
 101     }\
 102 }
 103 #define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
 104 #define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
 105
 106
 107 #define COMPXDP \
 108 u64 xm; int xe; int xs; int xc
 109
 110 #define COMPYDP \
 111 u64 ym; int ye; int ys; int yc
 112
 113 #define EXPLODEDP(v, vc, vs, ve, vm) \
 114 {\
 115     vm = DPMANT(v);\
 116     vs = DPSIGN(v);\
 117     ve = DPBEXP(v);\
 118     if(ve == DP_EMAX+1+DP_EBIAS){\
 119         if(vm == 0)\
 120           vc = IEEE754_CLASS_INF;\
 121         else if(vm & DP_MBIT(DP_MBITS-1)) \
 122           vc = IEEE754_CLASS_SNAN;\
 123         else \
 124           vc = IEEE754_CLASS_QNAN;\
 125     } else if(ve == DP_EMIN-1+DP_EBIAS) {\
 126         if(vm) {\
 127             ve = DP_EMIN;\
 128             vc = IEEE754_CLASS_DNORM;\
 129         } else\
 130           vc = IEEE754_CLASS_ZERO;\
 131     } else {\
 132         ve -= DP_EBIAS;\
 133         vm |= DP_HIDDEN_BIT;\
 134         vc = IEEE754_CLASS_NORM;\
 135     }\
 136 }
 137 #define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
 138 #define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
 139
 140 #define FLUSHDP(v, vc, vs, ve, vm) \
 141         if(vc==IEEE754_CLASS_DNORM) {\
 142             if(ieee754_csr.nod) {\
 143                 SETCX(IEEE754_INEXACT);\
 144                 vc = IEEE754_CLASS_ZERO;\
 145                 ve = DP_EMIN-1+DP_EBIAS;\
 146                 vm = 0;\
 147                 v = ieee754dp_zero(vs);\
 148             }\
 149         }
 150
 151 #define FLUSHSP(v, vc, vs, ve, vm) \
 152         if(vc==IEEE754_CLASS_DNORM) {\
 153             if(ieee754_csr.nod) {\
 154                 SETCX(IEEE754_INEXACT);\
 155                 vc = IEEE754_CLASS_ZERO;\
 156                 ve = SP_EMIN-1+SP_EBIAS;\
 157                 vm = 0;\
 158                 v = ieee754sp_zero(vs);\
 159             }\
 160         }
 161
 162 #define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
 163 #define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
 164 #define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
 165 #define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)