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/* mpz_mul_ui/si (product, multiplier, small_multiplicand) -- Set PRODUCT to
MULTIPLICATOR times SMALL_MULTIPLICAND.
Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2002, 2005 Free Software
Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
#include "gmp.h"
#include "gmp-impl.h"
#ifdef OPERATION_mul_si
#define FUNCTION mpz_mul_si
#define MULTIPLICAND_UNSIGNED
#define MULTIPLICAND_ABS(x) ((unsigned long) ABS(x))
#endif
#ifdef OPERATION_mul_ui
#define FUNCTION mpz_mul_ui
#define MULTIPLICAND_UNSIGNED unsigned
#define MULTIPLICAND_ABS(x) x
#endif
#ifndef FUNCTION
Error, error, unrecognised OPERATION
#endif
void
FUNCTION (mpz_ptr prod, mpz_srcptr mult,
MULTIPLICAND_UNSIGNED long int small_mult)
{
mp_size_t size = SIZ(mult);
mp_size_t sign_product = size;
mp_limb_t sml;
mp_limb_t cy;
mp_ptr pp;
if (size == 0 || small_mult == 0)
{
SIZ(prod) = 0;
return;
}
size = ABS (size);
sml = MULTIPLICAND_ABS (small_mult);
if (small_mult <= GMP_NUMB_MAX)
{
MPZ_REALLOC (prod, size + 1);
pp = PTR(prod);
cy = mpn_mul_1 (pp, PTR(mult), size, sml & GMP_NUMB_MASK);
pp[size] = cy;
size += cy != 0;
}
#if GMP_NAIL_BITS != 0
else
{
/* Operand too large for the current nails size. Use temporary for
intermediate products, to allow prod and mult being identical. */
mp_ptr tp;
TMP_DECL;
TMP_MARK;
tp = TMP_ALLOC_LIMBS (size + 2);
cy = mpn_mul_1 (tp, PTR(mult), size, sml & GMP_NUMB_MASK);
tp[size] = cy;
cy = mpn_addmul_1 (tp + 1, PTR(mult), size, sml >> GMP_NUMB_BITS);
tp[size + 1] = cy;
size += 2;
MPN_NORMALIZE_NOT_ZERO (tp, size); /* too general, need to trim one or two limb */
MPZ_REALLOC (prod, size);
pp = PTR(prod);
MPN_COPY (pp, tp, size);
TMP_FREE;
}
#endif
SIZ(prod) = ((sign_product < 0) ^ (small_mult < 0)) ? -size : size;
}
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