Return to mul_i.h CVS log

Up to [local] / OpenXM_contrib / gmp / mpz

Annotation of OpenXM_contrib/gmp/mpz/mul_i.h, Revision 1.1

1.1     ! ohara       1: /* mpz_mul_ui/si (product, multiplier, small_multiplicand) -- Set PRODUCT to
        !             2:    MULTIPLICATOR times SMALL_MULTIPLICAND.
        !             3:
        !             4: Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2002 Free Software Foundation,
        !             5: Inc.
        !             6:
        !             7: This file is part of the GNU MP Library.
        !             8:
        !             9: The GNU MP Library is free software; you can redistribute it and/or modify
        !            10: it under the terms of the GNU Lesser General Public License as published by
        !            11: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            12: option) any later version.
        !            13:
        !            14: The GNU MP Library is distributed in the hope that it will be useful, but
        !            15: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            16: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            17: License for more details.
        !            18:
        !            19: You should have received a copy of the GNU Lesser General Public License
        !            20: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            21: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            22: MA 02111-1307, USA. */
        !            23:
        !            24: #include "gmp.h"
        !            25: #include "gmp-impl.h"
        !            26:
        !            27:
        !            28: #ifdef OPERATION_mul_si
        !            29: #define FUNCTION               mpz_mul_si
        !            30: #define MULTIPLICAND_UNSIGNED
        !            31: #define MULTIPLICAND_ABS(x)    ((unsigned long) ABS(x))
        !            32: #endif
        !            33:
        !            34: #ifdef OPERATION_mul_ui
        !            35: #define FUNCTION               mpz_mul_ui
        !            36: #define MULTIPLICAND_UNSIGNED  unsigned
        !            37: #define MULTIPLICAND_ABS(x)    x
        !            38: #endif
        !            39:
        !            40: #ifndef FUNCTION
        !            41: Error, error, unrecognised OPERATION
        !            42: #endif
        !            43:
        !            44:
        !            45: void
        !            46: FUNCTION (mpz_ptr prod, mpz_srcptr mult,
        !            47:           MULTIPLICAND_UNSIGNED long int small_mult)
        !            48: {
        !            49:   mp_size_t size = SIZ(mult);
        !            50:   mp_size_t sign_product = size;
        !            51:   mp_limb_t sml;
        !            52:   mp_limb_t cy;
        !            53:   mp_ptr pp;
        !            54:
        !            55:   if (size == 0 || small_mult == 0)
        !            56:     {
        !            57:       SIZ(prod) = 0;
        !            58:       return;
        !            59:     }
        !            60:
        !            61:   size = ABS (size);
        !            62:
        !            63:   sml = MULTIPLICAND_ABS (small_mult);
        !            64:
        !            65:   if (small_mult <= GMP_NUMB_MAX)
        !            66:     {
        !            67:       MPZ_REALLOC (prod, size + 1);
        !            68:       pp = PTR(prod);
        !            69:       cy = mpn_mul_1 (pp, PTR(mult), size, sml & GMP_NUMB_MASK);
        !            70:       pp[size] = cy;
        !            71:       size += cy != 0;
        !            72:     }
        !            73: #if GMP_NAIL_BITS != 0
        !            74:   else
        !            75:     {
        !            76:       /* Operand too large for the current nails size.  Use temporary for
        !            77:         intermediate products, to allow prod and mult being identical.  */
        !            78:       mp_ptr tp;
        !            79:       TMP_DECL (mark);
        !            80:       TMP_MARK (mark);
        !            81:
        !            82:       tp = TMP_ALLOC_LIMBS (size + 2);
        !            83:
        !            84:       cy = mpn_mul_1 (tp, PTR(mult), size, sml & GMP_NUMB_MASK);
        !            85:       tp[size] = cy;
        !            86:       cy = mpn_addmul_1 (tp + 1, PTR(mult), size, sml >> GMP_NUMB_BITS);
        !            87:       tp[size + 1] = cy;
        !            88:       size += 2;
        !            89:       MPN_NORMALIZE_NOT_ZERO (tp, size); /* too general, need to trim one or two limb */
        !            90:       MPZ_REALLOC (prod, size);
        !            91:       pp = PTR(prod);
        !            92:       MPN_COPY (pp, tp, size);
        !            93:       TMP_FREE (mark);
        !            94:     }
        !            95: #endif
        !            96:
        !            97:   SIZ(prod) = ((sign_product < 0) ^ (small_mult < 0)) ? -size : size;
        !            98: }