Annotation of OpenXM_contrib/gmp/mpz/mul_siui.c, Revision 1.1
1.1 ! maekawa 1: /* mpz_mul_ui/si (product, multiplier, small_multiplicand) -- Set PRODUCT to
! 2: MULTIPLICATOR times SMALL_MULTIPLICAND.
! 3:
! 4: Copyright (C) 1991, 1993, 1994, 1996, 2000 Free Software Foundation, 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 2.1 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; see the file COPYING.LIB. If not, write to
! 20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
! 21: MA 02111-1307, USA. */
! 22:
! 23: #include "gmp.h"
! 24: #include "gmp-impl.h"
! 25:
! 26:
! 27: #ifdef OPERATION_mul_ui
! 28: #define FUNCTION mpz_mul_ui
! 29: #define MULTIPLICAND_UNSIGNED unsigned
! 30: #define MULTIPLICAND_ABS(x) x
! 31: #else
! 32: #ifdef OPERATION_mul_si
! 33: #define FUNCTION mpz_mul_si
! 34: #define MULTIPLICAND_UNSIGNED
! 35: #define MULTIPLICAND_ABS(x) ABS(x)
! 36: #else
! 37: Error, error, unrecognised OPERATION
! 38: #endif
! 39: #endif
! 40:
! 41:
! 42: void
! 43: #if __STDC__
! 44: FUNCTION (mpz_ptr prod, mpz_srcptr mult,
! 45: MULTIPLICAND_UNSIGNED long int small_mult)
! 46: #else
! 47: FUNCTION (prod, mult, small_mult)
! 48: mpz_ptr prod;
! 49: mpz_srcptr mult;
! 50: MULTIPLICAND_UNSIGNED long int small_mult;
! 51: #endif
! 52: {
! 53: mp_size_t size = mult->_mp_size;
! 54: mp_size_t sign_product = size;
! 55: mp_limb_t cy;
! 56: mp_size_t prod_size;
! 57: mp_ptr prod_ptr;
! 58:
! 59: if (size == 0 || small_mult == 0)
! 60: {
! 61: prod->_mp_size = 0;
! 62: return;
! 63: }
! 64: size = ABS (size);
! 65:
! 66: prod_size = size + 1;
! 67: if (prod->_mp_alloc < prod_size)
! 68: _mpz_realloc (prod, prod_size);
! 69:
! 70: prod_ptr = prod->_mp_d;
! 71:
! 72: cy = mpn_mul_1 (prod_ptr, mult->_mp_d, size,
! 73: (mp_limb_t) MULTIPLICAND_ABS (small_mult));
! 74: if (cy != 0)
! 75: {
! 76: prod_ptr[size] = cy;
! 77: size++;
! 78: }
! 79:
! 80: prod->_mp_size = ((sign_product < 0) ^ (small_mult < 0)) ? -size : size;
! 81: }
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