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Annotation of OpenXM_contrib/gmp/mpz/mul_ui.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpz_mul_ui(product, multiplier, small_multiplicand) -- Set
                      2:    PRODUCT to MULTIPLICATOR times SMALL_MULTIPLICAND.
                      3:
                      4: Copyright (C) 1991, 1993, 1994, 1996 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 Library General Public License as published by
                     10: the Free Software Foundation; either version 2 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 Library General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Library 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: void
                     27: #if __STDC__
                     28: mpz_mul_ui (mpz_ptr prod, mpz_srcptr mult, unsigned long int small_mult)
                     29: #else
                     30: mpz_mul_ui (prod, mult, small_mult)
                     31:      mpz_ptr prod;
                     32:      mpz_srcptr mult;
                     33:      unsigned long int small_mult;
                     34: #endif
                     35: {
                     36:   mp_size_t size = mult->_mp_size;
                     37:   mp_size_t sign_product = size;
                     38:   mp_limb_t cy;
                     39:   mp_size_t prod_size;
                     40:   mp_ptr prod_ptr;
                     41:
                     42:   size = ABS (size);
                     43:
                     44:   if (size == 0 || small_mult == 0)
                     45:     {
                     46:       prod->_mp_size = 0;
                     47:       return;
                     48:     }
                     49:
                     50:   prod_size = size + 1;
                     51:   if (prod->_mp_alloc < prod_size)
                     52:     _mpz_realloc (prod, prod_size);
                     53:
                     54:   prod_ptr = prod->_mp_d;
                     55:
                     56:   cy = mpn_mul_1 (prod_ptr, mult->_mp_d, size, (mp_limb_t) small_mult);
                     57:   if (cy != 0)
                     58:     {
                     59:       prod_ptr[size] = cy;
                     60:       size++;
                     61:     }
                     62:
                     63:   prod->_mp_size = sign_product >= 0 ? size : -size;
                     64: }