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