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Annotation of OpenXM/src/kan96xx/gmp-2.0.2/mpz/mul_ui.c, Revision 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: }