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