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Annotation of OpenXM_contrib/gmp/mpbsd/sdiv.c, Revision 1.1

1.1     ! maekawa     1: /* sdiv -- Divide a MINT by a short integer.  Produce a MINT quotient
        !             2:    and a short remainder.
        !             3:
        !             4: Copyright (C) 1991, 1994, 1995 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 "mp.h"
        !            24: #include "gmp.h"
        !            25: #include "gmp-impl.h"
        !            26: #include "longlong.h"
        !            27:
        !            28: void
        !            29: #if __STDC__
        !            30: sdiv (const MINT *dividend, signed short int divisor_short, MINT *quot, short *rem_ptr)
        !            31: #else
        !            32: sdiv (dividend, divisor_short, quot, rem_ptr)
        !            33:      const MINT *dividend;
        !            34:      short int divisor_short;
        !            35:      MINT *quot;
        !            36:      short *rem_ptr;
        !            37: #endif
        !            38: {
        !            39:   mp_size_t sign_dividend;
        !            40:   signed long int sign_divisor;
        !            41:   mp_size_t dividend_size, quot_size;
        !            42:   mp_ptr dividend_ptr, quot_ptr;
        !            43:   mp_limb_t divisor_limb;
        !            44:   mp_limb_t remainder_limb;
        !            45:
        !            46:   sign_dividend = dividend->_mp_size;
        !            47:   dividend_size = ABS (dividend->_mp_size);
        !            48:
        !            49:   if (dividend_size == 0)
        !            50:     {
        !            51:       quot->_mp_size = 0;
        !            52:       *rem_ptr = 0;
        !            53:       return;
        !            54:     }
        !            55:
        !            56:   sign_divisor = divisor_short;
        !            57:   divisor_limb = ABS (divisor_short);
        !            58:
        !            59:   /* No need for temporary allocation and copying even if QUOT == DIVIDEND
        !            60:      as the divisor is just one limb, and thus no intermediate remainders
        !            61:      need to be stored.  */
        !            62:
        !            63:   if (quot->_mp_alloc < dividend_size)
        !            64:     _mp_realloc (quot, dividend_size);
        !            65:
        !            66:   quot_ptr = quot->_mp_d;
        !            67:   dividend_ptr = dividend->_mp_d;
        !            68:
        !            69:   remainder_limb = mpn_divmod_1 (quot_ptr,
        !            70:                                 dividend_ptr, dividend_size, divisor_limb);
        !            71:
        !            72:   *rem_ptr = sign_dividend >= 0 ? remainder_limb : -remainder_limb;
        !            73:   /* The quotient is DIVIDEND_SIZE limbs, but the most significant
        !            74:      might be zero.  Set QUOT_SIZE properly. */
        !            75:   quot_size = dividend_size - (quot_ptr[dividend_size - 1] == 0);
        !            76:   quot->_mp_size = (sign_divisor ^ sign_dividend) >= 0 ? quot_size : -quot_size;
        !            77: }