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| 1 /* mpf_fits_s*_p -- test whether an mpf fits a C signed type. | |
| 2 | |
| 3 Copyright 2001, 2002 Free Software Foundation, Inc. | |
| 4 | |
| 5 This file is part of the GNU MP Library. | |
| 6 | |
| 7 The GNU MP Library is free software; you can redistribute it and/or modify | |
| 8 it under the terms of the GNU Lesser General Public License as published by | |
| 9 the Free Software Foundation; either version 3 of the License, or (at your | |
| 10 option) any later version. | |
| 11 | |
| 12 The GNU MP Library is distributed in the hope that it will be useful, but | |
| 13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public | |
| 15 License for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU Lesser General Public License | |
| 18 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ | |
| 19 | |
| 20 #include "gmp.h" | |
| 21 #include "gmp-impl.h" | |
| 22 | |
| 23 | |
| 24 /* Notice this is equivalent to mpz_set_f + mpz_fits_s*_p. */ | |
| 25 | |
| 26 int | |
| 27 FUNCTION (mpf_srcptr f) | |
| 28 { | |
| 29 mp_size_t fs, fn; | |
| 30 mp_srcptr fp; | |
| 31 mp_exp_t exp; | |
| 32 mp_limb_t fl; | |
| 33 | |
| 34 fs = SIZ(f); | |
| 35 if (fs == 0) | |
| 36 return 1; /* zero fits */ | |
| 37 | |
| 38 exp = EXP(f); | |
| 39 if (exp < 1) | |
| 40 return 1; /* -1 < f < 1 truncates to zero, so fits */ | |
| 41 | |
| 42 fp = PTR(f); | |
| 43 fn = ABS (fs); | |
| 44 | |
| 45 if (exp == 1) | |
| 46 { | |
| 47 fl = fp[fn-1]; | |
| 48 } | |
| 49 #if GMP_NAIL_BITS != 0 | |
| 50 else if (exp == 2 && MAXIMUM > GMP_NUMB_MAX) | |
| 51 { | |
| 52 fl = fp[fn-1]; | |
| 53 if ((fl >> GMP_NAIL_BITS) != 0) | |
| 54 return 0; | |
| 55 fl = (fl << GMP_NUMB_BITS); | |
| 56 if (fn >= 2) | |
| 57 fl |= fp[fn-2]; | |
| 58 } | |
| 59 #endif | |
| 60 else | |
| 61 return 0; | |
| 62 | |
| 63 return fl <= (fs >= 0 ? (mp_limb_t) MAXIMUM : - (mp_limb_t) MINIMUM); | |
| 64 } | |
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