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Diffstat (limited to 'contrib/libgmp/mpq/cmp.c')
| -rw-r--r-- | contrib/libgmp/mpq/cmp.c | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/contrib/libgmp/mpq/cmp.c b/contrib/libgmp/mpq/cmp.c deleted file mode 100644 index fc530e3..0000000 --- a/contrib/libgmp/mpq/cmp.c +++ /dev/null @@ -1,120 +0,0 @@ -/* mpq_cmp(u,v) -- Compare U, V. Return postive, zero, or negative - based on if U > V, U == V, or U < V. - -Copyright (C) 1991, 1994, 1996 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 the GNU Library General Public License as published by -the Free Software Foundation; either version 2 of the License, or (at your -option) any later version. - -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 Library General Public -License for more details. - -You should have received a copy of the GNU Library General Public License -along with the GNU MP Library; see the file COPYING.LIB. If not, write to -the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, -MA 02111-1307, USA. */ - -#include "gmp.h" -#include "gmp-impl.h" -#include "longlong.h" - -int -#if __STDC__ -mpq_cmp (const MP_RAT *op1, const MP_RAT *op2) -#else -mpq_cmp (op1, op2) - const MP_RAT *op1; - const MP_RAT *op2; -#endif -{ - mp_size_t num1_size = op1->_mp_num._mp_size; - mp_size_t den1_size = op1->_mp_den._mp_size; - mp_size_t num2_size = op2->_mp_num._mp_size; - mp_size_t den2_size = op2->_mp_den._mp_size; - mp_size_t tmp1_size, tmp2_size; - mp_ptr tmp1_ptr, tmp2_ptr; - mp_size_t num1_sign; - int cc; - TMP_DECL (marker); - - if (num1_size == 0) - return -num2_size; - if (num2_size == 0) - return num1_size; - if ((num1_size ^ num2_size) < 0) /* I.e. are the signs different? */ - return num1_size; - - num1_sign = num1_size; - num1_size = ABS (num1_size); - num2_size = ABS (num2_size); - - tmp1_size = num1_size + den2_size; - tmp2_size = num2_size + den1_size; - - /* 1. Check to see if we can tell which operand is larger by just looking at - the number of limbs. */ - - /* NUM1 x DEN2 is either TMP1_SIZE limbs or TMP1_SIZE-1 limbs. - Same for NUM1 x DEN1 with respect to TMP2_SIZE. */ - if (tmp1_size > tmp2_size + 1) - /* NUM1 x DEN2 is surely larger in magnitude than NUM2 x DEN1. */ - return num1_sign; - if (tmp2_size > tmp1_size + 1) - /* NUM1 x DEN2 is surely smaller in magnitude than NUM2 x DEN1. */ - return -num1_sign; - - /* 2. Same, but compare the number of significant bits. */ - { - int cnt1, cnt2; - unsigned long int bits1, bits2; - - count_leading_zeros (cnt1, op1->_mp_num._mp_d[num1_size - 1]); - count_leading_zeros (cnt2, op2->_mp_den._mp_d[den2_size - 1]); - bits1 = tmp1_size * BITS_PER_MP_LIMB - cnt1 - cnt2; - - count_leading_zeros (cnt1, op2->_mp_num._mp_d[num2_size - 1]); - count_leading_zeros (cnt2, op1->_mp_den._mp_d[den1_size - 1]); - bits2 = tmp2_size * BITS_PER_MP_LIMB - cnt1 - cnt2; - - if (bits1 > bits2 + 1) - return num1_sign; - if (bits2 > bits1 + 1) - return -num1_sign; - } - - /* 3. Finally, cross multiply and compare. */ - - TMP_MARK (marker); - tmp1_ptr = (mp_ptr) TMP_ALLOC (tmp1_size * BYTES_PER_MP_LIMB); - tmp2_ptr = (mp_ptr) TMP_ALLOC (tmp2_size * BYTES_PER_MP_LIMB); - - if (num1_size >= den2_size) - tmp1_size -= 0 == mpn_mul (tmp1_ptr, - op1->_mp_num._mp_d, num1_size, - op2->_mp_den._mp_d, den2_size); - else - tmp1_size -= 0 == mpn_mul (tmp1_ptr, - op2->_mp_den._mp_d, den2_size, - op1->_mp_num._mp_d, num1_size); - - if (num2_size >= den1_size) - tmp2_size -= 0 == mpn_mul (tmp2_ptr, - op2->_mp_num._mp_d, num2_size, - op1->_mp_den._mp_d, den1_size); - else - tmp2_size -= 0 == mpn_mul (tmp2_ptr, - op1->_mp_den._mp_d, den1_size, - op2->_mp_num._mp_d, num2_size); - - - cc = tmp1_size - tmp2_size != 0 - ? tmp1_size - tmp2_size : mpn_cmp (tmp1_ptr, tmp2_ptr, tmp1_size); - TMP_FREE (marker); - return num1_sign < 0 ? -cc : cc; -} |
