arch/mips/math-emu/ieee754dp.h

   1 /*
   2  * IEEE754 floating point
   3  * double precision 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 "ieee754int.h"
  30
  31 #define assert(expr) ((void)0)
  32
  33 /* 3bit extended double precision sticky right shift */
  34 #define XDPSRS(v,rs)    \
  35   ((rs > (DP_MBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
  36
  37 #define XDPSRSX1() \
  38   (xe++, (xm = (xm >> 1) | (xm & 1)))
  39
  40 #define XDPSRS1(v)      \
  41   (((v) >> 1) | ((v) & 1))
  42
  43 /* convert denormal to normalized with extended exponent */
  44 #define DPDNORMx(m,e) \
  45   while( (m >> DP_MBITS) == 0) { m <<= 1; e--; }
  46 #define DPDNORMX        DPDNORMx(xm, xe)
  47 #define DPDNORMY        DPDNORMx(ym, ye)
  48
  49 static inline ieee754dp builddp(int s, int bx, u64 m)
  50 {
  51         ieee754dp r;
  52
  53         assert((s) == 0 || (s) == 1);
  54         assert((bx) >= DP_EMIN - 1 + DP_EBIAS
  55                && (bx) <= DP_EMAX + 1 + DP_EBIAS);
  56         assert(((m) >> DP_MBITS) == 0);
  57
  58         r.parts.sign = s;
  59         r.parts.bexp = bx;
  60         r.parts.mant = m;
  61         return r;
  62 }
  63
  64 extern int ieee754dp_isnan(ieee754dp);
  65 extern int ieee754dp_issnan(ieee754dp);
  66 extern int ieee754si_xcpt(int, const char *, ...);
  67 extern s64 ieee754di_xcpt(s64, const char *, ...);
  68 extern ieee754dp ieee754dp_xcpt(ieee754dp, const char *, ...);
  69 extern ieee754dp ieee754dp_nanxcpt(ieee754dp, const char *, ...);
  70 extern ieee754dp ieee754dp_bestnan(ieee754dp, ieee754dp);
  71 extern ieee754dp ieee754dp_format(int, int, u64);
  72
  73
  74 #define DPNORMRET2(s, e, m, name, a0, a1) \
  75 { \
  76     ieee754dp V = ieee754dp_format(s, e, m); \
  77     if(TSTX()) \
  78       return ieee754dp_xcpt(V, name, a0, a1); \
  79     else \
  80       return V; \
  81 }
  82
  83 #define DPNORMRET1(s, e, m, name, a0)  DPNORMRET2(s, e, m, name, a0, a0)