1 /* mpz_tdiv_qr(quot,rem,dividend,divisor) -- Set QUOT to DIVIDEND/DIVISOR, 2 and REM to DIVIDEND mod DIVISOR. 3 4 Copyright 1991, 1993, 1994, 2000, 2001, 2005, 2011, 2012 Free Software 5 Foundation, Inc. 6 7 This file is part of the GNU MP Library. 8 9 The GNU MP Library is free software; you can redistribute it and/or modify 10 it under the terms of either: 11 12 * the GNU Lesser General Public License as published by the Free 13 Software Foundation; either version 3 of the License, or (at your 14 option) any later version. 15 16 or 17 18 * the GNU General Public License as published by the Free Software 19 Foundation; either version 2 of the License, or (at your option) any 20 later version. 21 22 or both in parallel, as here. 23 24 The GNU MP Library is distributed in the hope that it will be useful, but 25 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 26 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 27 for more details. 28 29 You should have received copies of the GNU General Public License and the 30 GNU Lesser General Public License along with the GNU MP Library. If not, 31 see https://www.gnu.org/licenses/. */ 32 33 #include "gmp-impl.h" 34 #include "longlong.h" 35 36 void 37 mpz_tdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr num, mpz_srcptr den) 38 { 39 mp_size_t ql; 40 mp_size_t ns, ds, nl, dl; 41 mp_ptr np, dp, qp, rp; 42 TMP_DECL; 43 44 ns = SIZ (num); 45 ds = SIZ (den); 46 nl = ABS (ns); 47 dl = ABS (ds); 48 ql = nl - dl + 1; 49 50 if (UNLIKELY (dl == 0)) 51 DIVIDE_BY_ZERO; 52 53 rp = MPZ_REALLOC (rem, dl); 54 55 if (ql <= 0) 56 { 57 if (num != rem) 58 { 59 np = PTR (num); 60 MPN_COPY (rp, np, nl); 61 SIZ (rem) = SIZ (num); 62 } 63 /* This needs to follow the assignment to rem, in case the 64 numerator and quotient are the same. */ 65 SIZ (quot) = 0; 66 return; 67 } 68 69 qp = MPZ_REALLOC (quot, ql); 70 71 TMP_MARK; 72 np = PTR (num); 73 dp = PTR (den); 74 75 /* FIXME: We should think about how to handle the temporary allocation. 76 Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to 77 allocate temp space. */ 78 79 /* Copy denominator to temporary space if it overlaps with the quotient 80 or remainder. */ 81 if (dp == rp || dp == qp) 82 { 83 mp_ptr tp; 84 tp = TMP_ALLOC_LIMBS (dl); 85 MPN_COPY (tp, dp, dl); 86 dp = tp; 87 } 88 /* Copy numerator to temporary space if it overlaps with the quotient or 89 remainder. */ 90 if (np == rp || np == qp) 91 { 92 mp_ptr tp; 93 tp = TMP_ALLOC_LIMBS (nl); 94 MPN_COPY (tp, np, nl); 95 np = tp; 96 } 97 98 mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl); 99 100 ql -= qp[ql - 1] == 0; 101 MPN_NORMALIZE (rp, dl); 102 103 SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql; 104 SIZ (rem) = ns >= 0 ? dl : -dl; 105 TMP_FREE; 106 } 107