65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
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/* mpz_mul_ui(product, multiplier, small_multiplicand) -- Set
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PRODUCT to MULTIPLICATOR times SMALL_MULTIPLICAND.
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Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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#if __STDC__
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mpz_mul_ui (mpz_ptr prod, mpz_srcptr mult, unsigned long int small_mult)
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#else
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mpz_mul_ui (prod, mult, small_mult)
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mpz_ptr prod;
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mpz_srcptr mult;
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unsigned long int small_mult;
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#endif
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{
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mp_size_t size = mult->_mp_size;
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mp_size_t sign_product = size;
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mp_limb_t cy;
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mp_size_t prod_size;
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mp_ptr prod_ptr;
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size = ABS (size);
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if (size == 0 || small_mult == 0)
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{
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prod->_mp_size = 0;
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return;
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}
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prod_size = size + 1;
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if (prod->_mp_alloc < prod_size)
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_mpz_realloc (prod, prod_size);
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prod_ptr = prod->_mp_d;
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cy = mpn_mul_1 (prod_ptr, mult->_mp_d, size, (mp_limb_t) small_mult);
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if (cy != 0)
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{
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prod_ptr[size] = cy;
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size++;
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}
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prod->_mp_size = sign_product >= 0 ? size : -size;
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}
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