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Diffstat (limited to 'Build/source/libs/gmp/gmp-6.0.0/mpq/div.c')
-rw-r--r-- | Build/source/libs/gmp/gmp-6.0.0/mpq/div.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpq/div.c b/Build/source/libs/gmp/gmp-6.0.0/mpq/div.c new file mode 100644 index 00000000000..7d91e0998ae --- /dev/null +++ b/Build/source/libs/gmp/gmp-6.0.0/mpq/div.c @@ -0,0 +1,115 @@ +/* mpq_div -- divide two rational numbers. + +Copyright 1991, 1994-1996, 2000, 2001 Free Software Foundation, Inc. + +This file is part of the GNU MP Library. + +The GNU MP Library is free software; you can redistribute it and/or modify +it under the terms of either: + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your + option) any later version. + +or + + * the GNU General Public License as published by the Free Software + Foundation; either version 2 of the License, or (at your option) any + later version. + +or both in parallel, as here. + +The GNU MP Library is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received copies of the GNU General Public License and the +GNU Lesser General Public License along with the GNU MP Library. If not, +see https://www.gnu.org/licenses/. */ + +#include "gmp.h" +#include "gmp-impl.h" + + +void +mpq_div (mpq_ptr quot, mpq_srcptr op1, mpq_srcptr op2) +{ + mpz_t gcd1, gcd2; + mpz_t tmp1, tmp2; + mpz_t numtmp; + mp_size_t op1_num_size; + mp_size_t op1_den_size; + mp_size_t op2_num_size; + mp_size_t op2_den_size; + mp_size_t alloc; + TMP_DECL; + + op2_num_size = ABSIZ(NUM(op2)); + + if (UNLIKELY (op2_num_size == 0)) + DIVIDE_BY_ZERO; + + op1_num_size = ABSIZ(NUM(op1)); + + if (op1_num_size == 0) + { + /* We special case this to simplify allocation logic; gcd(0,x) = x + is a singular case for the allocations. */ + SIZ(NUM(quot)) = 0; + PTR(DEN(quot))[0] = 1; + SIZ(DEN(quot)) = 1; + return; + } + + op2_den_size = SIZ(DEN(op2)); + op1_den_size = SIZ(DEN(op1)); + + TMP_MARK; + + alloc = MIN (op1_num_size, op2_num_size); + MPZ_TMP_INIT (gcd1, alloc); + + alloc = MIN (op1_den_size, op2_den_size); + MPZ_TMP_INIT (gcd2, alloc); + + alloc = MAX (op1_num_size, op2_num_size); + MPZ_TMP_INIT (tmp1, alloc); + + alloc = MAX (op1_den_size, op2_den_size); + MPZ_TMP_INIT (tmp2, alloc); + + alloc = op1_num_size + op2_den_size; + MPZ_TMP_INIT (numtmp, alloc); + + /* QUOT might be identical to either operand, so don't store the result there + until we are finished with the input operands. We can overwrite the + numerator of QUOT when we are finished with the numerators of OP1 and + OP2. */ + + mpz_gcd (gcd1, NUM(op1), NUM(op2)); + mpz_gcd (gcd2, DEN(op2), DEN(op1)); + + mpz_divexact_gcd (tmp1, NUM(op1), gcd1); + mpz_divexact_gcd (tmp2, DEN(op2), gcd2); + + mpz_mul (numtmp, tmp1, tmp2); + + mpz_divexact_gcd (tmp1, NUM(op2), gcd1); + mpz_divexact_gcd (tmp2, DEN(op1), gcd2); + + mpz_mul (DEN(quot), tmp1, tmp2); + + /* We needed to go via NUMTMP to take care of QUOT being the same as OP2. + Now move NUMTMP to QUOT->_mp_num. */ + mpz_set (NUM(quot), numtmp); + + /* Keep the denominator positive. */ + if (SIZ(DEN(quot)) < 0) + { + SIZ(DEN(quot)) = -SIZ(DEN(quot)); + SIZ(NUM(quot)) = -SIZ(NUM(quot)); + } + + TMP_FREE; +} |