79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/* 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 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 General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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The GNU MP Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the GNU MP Library; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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void
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#ifdef __STDC__
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mpz_mul_ui (MP_INT *prod, const MP_INT *mult,
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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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MP_INT *prod;
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const MP_INT *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 mult_size = mult->size;
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mp_size sign_product = mult_size;
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mp_size i;
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mp_limb cy;
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mp_size prod_size;
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mp_srcptr mult_ptr;
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mp_ptr prod_ptr;
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mult_size = ABS (mult_size);
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if (mult_size == 0 || small_mult == 0)
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{
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prod->size = 0;
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return;
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}
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prod_size = mult_size + 1;
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if (prod->alloc < prod_size)
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_mpz_realloc (prod, prod_size);
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mult_ptr = mult->d;
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prod_ptr = prod->d;
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cy = 0;
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for (i = 0; i < mult_size; i++)
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{
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mp_limb p1, p0;
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umul_ppmm (p1, p0, small_mult, mult_ptr[i]);
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p0 += cy;
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cy = p1 + (p0 < cy);
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prod_ptr[i] = p0;
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}
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prod_size = mult_size;
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if (cy != 0)
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{
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prod_ptr[mult_size] = cy;
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prod_size++;
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}
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prod->size = sign_product > 0 ? prod_size : -prod_size;
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}
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