1 /**************************************************************** 2 3 The author of this software is David M. Gay. 4 5 Copyright (C) 1998, 2000 by Lucent Technologies 6 All Rights Reserved 7 8 Permission to use, copy, modify, and distribute this software and 9 its documentation for any purpose and without fee is hereby 10 granted, provided that the above copyright notice appear in all 11 copies and that both that the copyright notice and this 12 permission notice and warranty disclaimer appear in supporting 13 documentation, and that the name of Lucent or any of its entities 14 not be used in advertising or publicity pertaining to 15 distribution of the software without specific, written prior 16 permission. 17 18 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 20 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 21 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 22 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 23 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 24 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 25 THIS SOFTWARE. 26 27 ****************************************************************/ 28 29 /* Please send bug reports to David M. Gay (dmg at acm dot org, 30 * with " at " changed at "@" and " dot " changed to "."). */ 31 32 #include "gdtoaimp.h" 33 34 void 35 #ifdef KR_headers 36 ULtodd(L, bits, exp, k) ULong *L; ULong *bits; Long exp; int k; 37 #else 38 ULtodd(ULong *L, ULong *bits, Long exp, int k) 39 #endif 40 { 41 int i, j; 42 43 switch(k & STRTOG_Retmask) { 44 case STRTOG_NoNumber: 45 case STRTOG_Zero: 46 L[0] = L[1] = L[2] = L[3] = 0; 47 break; 48 49 case STRTOG_Normal: 50 L[_1] = (bits[1] >> 21 | bits[2] << 11) & (ULong)0xffffffffL; 51 L[_0] = (bits[2] >> 21) | (bits[3] << 11 & 0xfffff) 52 | ((exp + 0x3ff + 105) << 20); 53 exp += 0x3ff + 52; 54 if (bits[1] &= 0x1fffff) { 55 i = hi0bits(bits[1]) - 11; 56 if (i >= exp) { 57 i = exp - 1; 58 exp = 0; 59 } 60 else 61 exp -= i; 62 if (i > 0) { 63 bits[1] = bits[1] << i | bits[0] >> (32-i); 64 bits[0] = bits[0] << i & (ULong)0xffffffffL; 65 } 66 } 67 else if (bits[0]) { 68 i = hi0bits(bits[0]) + 21; 69 if (i >= exp) { 70 i = exp - 1; 71 exp = 0; 72 } 73 else 74 exp -= i; 75 if (i < 32) { 76 bits[1] = bits[0] >> (32 - i); 77 bits[0] = bits[0] << i & (ULong)0xffffffffL; 78 } 79 else { 80 bits[1] = bits[0] << (i - 32); 81 bits[0] = 0; 82 } 83 } 84 else { 85 L[2] = L[3] = 0; 86 break; 87 } 88 L[2+_1] = bits[0]; 89 L[2+_0] = (bits[1] & 0xfffff) | (exp << 20); 90 break; 91 92 case STRTOG_Denormal: 93 if (bits[3]) 94 goto nearly_normal; 95 if (bits[2]) 96 goto partly_normal; 97 if (bits[1] & 0xffe00000) 98 goto hardly_normal; 99 /* completely denormal */ 100 L[2] = L[3] = 0; 101 L[_1] = bits[0]; 102 L[_0] = bits[1]; 103 break; 104 105 nearly_normal: 106 i = hi0bits(bits[3]) - 11; /* i >= 12 */ 107 j = 32 - i; 108 L[_0] = ((bits[3] << i | bits[2] >> j) & 0xfffff) 109 | ((65 - i) << 20); 110 L[_1] = (bits[2] << i | bits[1] >> j) & 0xffffffffL; 111 L[2+_0] = bits[1] & (((ULong)1L << j) - 1); 112 L[2+_1] = bits[0]; 113 break; 114 115 partly_normal: 116 i = hi0bits(bits[2]) - 11; 117 if (i < 0) { 118 j = -i; 119 i += 32; 120 L[_0] = (bits[2] >> j & 0xfffff) | ((33 + j) << 20); 121 L[_1] = (bits[2] << i | bits[1] >> j) & 0xffffffffL; 122 L[2+_0] = bits[1] & (((ULong)1L << j) - 1); 123 L[2+_1] = bits[0]; 124 break; 125 } 126 if (i == 0) { 127 L[_0] = (bits[2] & 0xfffff) | (33 << 20); 128 L[_1] = bits[1]; 129 L[2+_0] = 0; 130 L[2+_1] = bits[0]; 131 break; 132 } 133 j = 32 - i; 134 L[_0] = (((bits[2] << i) | (bits[1] >> j)) & 0xfffff) 135 | ((j + 1) << 20); 136 L[_1] = (bits[1] << i | bits[0] >> j) & 0xffffffffL; 137 L[2+_0] = 0; 138 L[2+_1] = bits[0] & ((1L << j) - 1); 139 break; 140 141 hardly_normal: 142 j = 11 - hi0bits(bits[1]); 143 i = 32 - j; 144 L[_0] = (bits[1] >> j & 0xfffff) | ((j + 1) << 20); 145 L[_1] = (bits[1] << i | bits[0] >> j) & 0xffffffffL; 146 L[2+_0] = 0; 147 L[2+_1] = bits[0] & (((ULong)1L << j) - 1); 148 break; 149 150 case STRTOG_Infinite: 151 L[_0] = L[2+_0] = 0x7ff00000; 152 L[_1] = L[2+_1] = 0; 153 break; 154 155 case STRTOG_NaN: 156 L[0] = L[2] = d_QNAN0; 157 L[1] = L[3] = d_QNAN1; 158 break; 159 160 case STRTOG_NaNbits: 161 L[_1] = (bits[1] >> 21 | bits[2] << 11) & (ULong)0xffffffffL; 162 L[_0] = bits[2] >> 21 | bits[3] << 11 163 | (ULong)0x7ff00000L; 164 L[2+_1] = bits[0]; 165 L[2+_0] = bits[1] | (ULong)0x7ff00000L; 166 } 167 if (k & STRTOG_Neg) { 168 L[_0] |= 0x80000000L; 169 L[2+_0] |= 0x80000000L; 170 } 171 } 172 173 int 174 #ifdef KR_headers 175 strtordd(s, sp, rounding, dd) CONST char *s; char **sp; int rounding; double *dd; 176 #else 177 strtordd(CONST char *s, char **sp, int rounding, double *dd) 178 #endif 179 { 180 #ifdef Sudden_Underflow 181 static FPI fpi0 = { 106, 1-1023, 2046-1023-106+1, 1, 1 }; 182 #else 183 static FPI fpi0 = { 106, 1-1023-53+1, 2046-1023-106+1, 1, 0 }; 184 #endif 185 FPI *fpi, fpi1; 186 ULong bits[4]; 187 Long exp; 188 int k; 189 190 fpi = &fpi0; 191 if (rounding != FPI_Round_near) { 192 fpi1 = fpi0; 193 fpi1.rounding = rounding; 194 fpi = &fpi1; 195 } 196 k = strtodg(s, sp, fpi, &exp, bits); 197 ULtodd((ULong*)dd, bits, exp, k); 198 return k; 199 } 200