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Linux/include/math-emu/double.h

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  1 /* Software floating-point emulation.
  2    Definitions for IEEE Double Precision
  3    Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
  4    This file is part of the GNU C Library.
  5    Contributed by Richard Henderson (rth@cygnus.com),
  6                   Jakub Jelinek (jj@ultra.linux.cz),
  7                   David S. Miller (davem@redhat.com) and
  8                   Peter Maydell (pmaydell@chiark.greenend.org.uk).
  9 
 10    The GNU C Library is free software; you can redistribute it and/or
 11    modify it under the terms of the GNU Library General Public License as
 12    published by the Free Software Foundation; either version 2 of the
 13    License, or (at your option) any later version.
 14 
 15    The GNU C Library is distributed in the hope that it will be useful,
 16    but WITHOUT ANY WARRANTY; without even the implied warranty of
 17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18    Library General Public License for more details.
 19 
 20    You should have received a copy of the GNU Library General Public
 21    License along with the GNU C Library; see the file COPYING.LIB.  If
 22    not, write to the Free Software Foundation, Inc.,
 23    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 24 
 25 #ifndef    __MATH_EMU_DOUBLE_H__
 26 #define    __MATH_EMU_DOUBLE_H__
 27 
 28 #if _FP_W_TYPE_SIZE < 32
 29 #error "Here's a nickel kid.  Go buy yourself a real computer."
 30 #endif
 31 
 32 #if _FP_W_TYPE_SIZE < 64
 33 #define _FP_FRACTBITS_D         (2 * _FP_W_TYPE_SIZE)
 34 #else
 35 #define _FP_FRACTBITS_D         _FP_W_TYPE_SIZE
 36 #endif
 37 
 38 #define _FP_FRACBITS_D          53
 39 #define _FP_FRACXBITS_D         (_FP_FRACTBITS_D - _FP_FRACBITS_D)
 40 #define _FP_WFRACBITS_D         (_FP_WORKBITS + _FP_FRACBITS_D)
 41 #define _FP_WFRACXBITS_D        (_FP_FRACTBITS_D - _FP_WFRACBITS_D)
 42 #define _FP_EXPBITS_D           11
 43 #define _FP_EXPBIAS_D           1023
 44 #define _FP_EXPMAX_D            2047
 45 
 46 #define _FP_QNANBIT_D           \
 47         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-2) % _FP_W_TYPE_SIZE)
 48 #define _FP_IMPLBIT_D           \
 49         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-1) % _FP_W_TYPE_SIZE)
 50 #define _FP_OVERFLOW_D          \
 51         ((_FP_W_TYPE)1 << _FP_WFRACBITS_D % _FP_W_TYPE_SIZE)
 52 
 53 #if _FP_W_TYPE_SIZE < 64
 54 
 55 union _FP_UNION_D
 56 {
 57   double flt;
 58   struct {
 59 #if __BYTE_ORDER == __BIG_ENDIAN
 60     unsigned sign  : 1;
 61     unsigned exp   : _FP_EXPBITS_D;
 62     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
 63     unsigned frac0 : _FP_W_TYPE_SIZE;
 64 #else
 65     unsigned frac0 : _FP_W_TYPE_SIZE;
 66     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
 67     unsigned exp   : _FP_EXPBITS_D;
 68     unsigned sign  : 1;
 69 #endif
 70   } bits __attribute__((packed));
 71 };
 72 
 73 #define FP_DECL_D(X)            _FP_DECL(2,X)
 74 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_2(D,X,val)
 75 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_2_P(D,X,val)
 76 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_2(D,val,X)
 77 #define FP_PACK_RAW_DP(val,X)           \
 78   do {                                  \
 79     if (!FP_INHIBIT_RESULTS)            \
 80       _FP_PACK_RAW_2_P(D,val,X);        \
 81   } while (0)
 82 
 83 #define FP_UNPACK_D(X,val)              \
 84   do {                                  \
 85     _FP_UNPACK_RAW_2(D,X,val);          \
 86     _FP_UNPACK_CANONICAL(D,2,X);        \
 87   } while (0)
 88 
 89 #define FP_UNPACK_DP(X,val)             \
 90   do {                                  \
 91     _FP_UNPACK_RAW_2_P(D,X,val);        \
 92     _FP_UNPACK_CANONICAL(D,2,X);        \
 93   } while (0)
 94 
 95 #define FP_PACK_D(val,X)                \
 96   do {                                  \
 97     _FP_PACK_CANONICAL(D,2,X);          \
 98     _FP_PACK_RAW_2(D,val,X);            \
 99   } while (0)
100 
101 #define FP_PACK_DP(val,X)               \
102   do {                                  \
103     _FP_PACK_CANONICAL(D,2,X);          \
104     if (!FP_INHIBIT_RESULTS)            \
105       _FP_PACK_RAW_2_P(D,val,X);        \
106   } while (0)
107 
108 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,2,X)
109 #define FP_NEG_D(R,X)                   _FP_NEG(D,2,R,X)
110 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,2,R,X,Y)
111 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,2,R,X,Y)
112 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,2,R,X,Y)
113 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,2,R,X,Y)
114 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,2,R,X)
115 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_2(R,S,T,X,Q)
116 
117 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,2,r,X,Y,un)
118 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,2,r,X,Y)
119 
120 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,2,r,X,rsz,rsg)
121 #define FP_TO_INT_ROUND_D(r,X,rsz,rsg)  _FP_TO_INT_ROUND(D,2,r,X,rsz,rsg)
122 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,2,X,r,rs,rt)
123 
124 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_2(X)
125 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_2(X)
126 
127 #else
128 
129 union _FP_UNION_D
130 {
131   double flt;
132   struct {
133 #if __BYTE_ORDER == __BIG_ENDIAN
134     unsigned sign : 1;
135     unsigned exp  : _FP_EXPBITS_D;
136     unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
137 #else
138     unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
139     unsigned exp  : _FP_EXPBITS_D;
140     unsigned sign : 1;
141 #endif
142   } bits __attribute__((packed));
143 };
144 
145 #define FP_DECL_D(X)            _FP_DECL(1,X)
146 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_1(D,X,val)
147 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_1_P(D,X,val)
148 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_1(D,val,X)
149 #define FP_PACK_RAW_DP(val,X)           \
150   do {                                  \
151     if (!FP_INHIBIT_RESULTS)            \
152       _FP_PACK_RAW_1_P(D,val,X);        \
153   } while (0)
154 
155 #define FP_UNPACK_D(X,val)              \
156   do {                                  \
157     _FP_UNPACK_RAW_1(D,X,val);          \
158     _FP_UNPACK_CANONICAL(D,1,X);        \
159   } while (0)
160 
161 #define FP_UNPACK_DP(X,val)             \
162   do {                                  \
163     _FP_UNPACK_RAW_1_P(D,X,val);        \
164     _FP_UNPACK_CANONICAL(D,1,X);        \
165   } while (0)
166 
167 #define FP_PACK_D(val,X)                \
168   do {                                  \
169     _FP_PACK_CANONICAL(D,1,X);          \
170     _FP_PACK_RAW_1(D,val,X);            \
171   } while (0)
172 
173 #define FP_PACK_DP(val,X)               \
174   do {                                  \
175     _FP_PACK_CANONICAL(D,1,X);          \
176     if (!FP_INHIBIT_RESULTS)            \
177       _FP_PACK_RAW_1_P(D,val,X);        \
178   } while (0)
179 
180 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,1,X)
181 #define FP_NEG_D(R,X)                   _FP_NEG(D,1,R,X)
182 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,1,R,X,Y)
183 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,1,R,X,Y)
184 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,1,R,X,Y)
185 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,1,R,X,Y)
186 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,1,R,X)
187 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
188 
189 /* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
190    the target machine.  */
191 
192 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,1,r,X,Y,un)
193 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,1,r,X,Y)
194 
195 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,1,r,X,rsz,rsg)
196 #define FP_TO_INT_ROUND_D(r,X,rsz,rsg)  _FP_TO_INT_ROUND(D,1,r,X,rsz,rsg)
197 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,1,X,r,rs,rt)
198 
199 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_1(X)
200 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_1(X)
201 
202 #endif /* W_TYPE_SIZE < 64 */
203 
204 
205 #endif /* __MATH_EMU_DOUBLE_H__ */
206 

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