arch/mips/math-emu/ieee754sp.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  *
   9  * ########################################################################
  10  *
  11  *  This program is free software; you can distribute it and/or modify it
  12  *  under the terms of the GNU General Public License (Version 2) as
  13  *  published by the Free Software Foundation.
  14  *
  15  *  This program is distributed in the hope it will be useful, but WITHOUT
  16  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18  *  for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  23  *
  24  * ########################################################################
  25  */
  26
  27
  28 #include "ieee754int.h"
  29
  30 #define assert(expr) ((void)0)
  31
  32 /* 3bit extended single precision sticky right shift */
  33 #define SPXSRSXn(rs) \
  34   (xe += rs, \
  35    xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
  36
  37 #define SPXSRSX1() \
  38   (xe++, (xm = (xm >> 1) | (xm & 1)))
  39
  40 #define SPXSRSYn(rs) \
  41    (ye+=rs, \
  42     ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
  43
  44 #define SPXSRSY1() \
  45    (ye++, (ym = (ym >> 1) | (ym & 1)))
  46
  47 /* convert denormal to normalized with extended exponent */
  48 #define SPDNORMx(m,e) \
  49   while( (m >> SP_MBITS) == 0) { m <<= 1; e--; }
  50 #define SPDNORMX        SPDNORMx(xm, xe)
  51 #define SPDNORMY        SPDNORMx(ym, ye)
  52
  53 static inline ieee754sp buildsp(int s, int bx, unsigned m)
  54 {
  55         ieee754sp r;
  56
  57         assert((s) == 0 || (s) == 1);
  58         assert((bx) >= SP_EMIN - 1 + SP_EBIAS
  59                && (bx) <= SP_EMAX + 1 + SP_EBIAS);
  60         assert(((m) >> SP_MBITS) == 0);
  61
  62         r.parts.sign = s;
  63         r.parts.bexp = bx;
  64         r.parts.mant = m;
  65
  66         return r;
  67 }
  68
  69 extern int ieee754sp_isnan(ieee754sp);
  70 extern int ieee754sp_issnan(ieee754sp);
  71 extern int ieee754si_xcpt(int, const char *, ...);
  72 extern s64 ieee754di_xcpt(s64, const char *, ...);
  73 extern ieee754sp ieee754sp_xcpt(ieee754sp, const char *, ...);
  74 extern ieee754sp ieee754sp_nanxcpt(ieee754sp, const char *, ...);
  75 extern ieee754sp ieee754sp_bestnan(ieee754sp, ieee754sp);
  76 extern ieee754sp ieee754sp_format(int, int, unsigned);
  77
  78
  79 #define SPNORMRET2(s, e, m, name, a0, a1) \
  80 { \
  81     ieee754sp V = ieee754sp_format(s, e, m); \
  82     if(TSTX()) \
  83       return ieee754sp_xcpt(V, name, a0, a1); \
  84     else \
  85       return V; \
  86 }
  87
  88 #define SPNORMRET1(s, e, m, name, a0)  SPNORMRET2(s, e, m, name, a0, a0)