Annotation of OpenXM/src/kan96xx/gmp-2.0.2/mpz/sqrtrem.c, Revision 1.1
1.1 ! maekawa 1: /* mpz_sqrtrem(root,rem,x) -- Set ROOT to floor(sqrt(X)) and REM
! 2: to the remainder, i.e. X - ROOT**2.
! 3:
! 4: Copyright (C) 1991, 1993, 1994, 1996 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 "gmp.h"
! 24: #include "gmp-impl.h"
! 25:
! 26: #ifndef BERKELEY_MP
! 27: void
! 28: #if __STDC__
! 29: mpz_sqrtrem (mpz_ptr root, mpz_ptr rem, mpz_srcptr op)
! 30: #else
! 31: mpz_sqrtrem (root, rem, op)
! 32: mpz_ptr root;
! 33: mpz_ptr rem;
! 34: mpz_srcptr op;
! 35: #endif
! 36: #else /* BERKELEY_MP */
! 37: void
! 38: #if __STDC__
! 39: msqrt (mpz_srcptr op, mpz_ptr root, mpz_ptr rem)
! 40: #else
! 41: msqrt (op, root, rem)
! 42: mpz_srcptr op;
! 43: mpz_ptr root;
! 44: mpz_ptr rem;
! 45: #endif
! 46: #endif /* BERKELEY_MP */
! 47: {
! 48: mp_size_t op_size, root_size, rem_size;
! 49: mp_ptr root_ptr, op_ptr;
! 50: mp_ptr free_me = NULL;
! 51: mp_size_t free_me_size;
! 52: TMP_DECL (marker);
! 53:
! 54: TMP_MARK (marker);
! 55: op_size = op->_mp_size;
! 56: if (op_size < 0)
! 57: op_size = 1 / (op_size > 0); /* Divide by zero for negative OP. */
! 58:
! 59: if (rem->_mp_alloc < op_size)
! 60: _mpz_realloc (rem, op_size);
! 61:
! 62: /* The size of the root is accurate after this simple calculation. */
! 63: root_size = (op_size + 1) / 2;
! 64:
! 65: root_ptr = root->_mp_d;
! 66: op_ptr = op->_mp_d;
! 67:
! 68: if (root->_mp_alloc < root_size)
! 69: {
! 70: if (root_ptr == op_ptr)
! 71: {
! 72: free_me = root_ptr;
! 73: free_me_size = root->_mp_alloc;
! 74: }
! 75: else
! 76: (*_mp_free_func) (root_ptr, root->_mp_alloc * BYTES_PER_MP_LIMB);
! 77:
! 78: root->_mp_alloc = root_size;
! 79: root_ptr = (mp_ptr) (*_mp_allocate_func) (root_size * BYTES_PER_MP_LIMB);
! 80: root->_mp_d = root_ptr;
! 81: }
! 82: else
! 83: {
! 84: /* Make OP not overlap with ROOT. */
! 85: if (root_ptr == op_ptr)
! 86: {
! 87: /* ROOT and OP are identical. Allocate temporary space for OP. */
! 88: op_ptr = (mp_ptr) TMP_ALLOC (op_size * BYTES_PER_MP_LIMB);
! 89: /* Copy to the temporary space. Hack: Avoid temporary variable
! 90: by using ROOT_PTR. */
! 91: MPN_COPY (op_ptr, root_ptr, op_size);
! 92: }
! 93: }
! 94:
! 95: rem_size = mpn_sqrtrem (root_ptr, rem->_mp_d, op_ptr, op_size);
! 96:
! 97: root->_mp_size = root_size;
! 98:
! 99: /* Write remainder size last, to enable us to define this function to
! 100: give only the square root remainder, if the user calls if with
! 101: ROOT == REM. */
! 102: rem->_mp_size = rem_size;
! 103:
! 104: if (free_me != NULL)
! 105: (*_mp_free_func) (free_me, free_me_size * BYTES_PER_MP_LIMB);
! 106: TMP_FREE (marker);
! 107: }
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