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/* mpz_sqrtrem(root,rem,x) -- Set ROOT to floor(sqrt(X)) and REM
to the remainder, i.e. X - ROOT**2.
Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2005, 2011, 2012 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"
void
mpz_sqrtrem (mpz_ptr root, mpz_ptr rem, mpz_srcptr op)
{
mp_size_t op_size, root_size, rem_size;
mp_ptr root_ptr, op_ptr, rem_ptr;
op_size = SIZ (op);
if (UNLIKELY (op_size <= 0))
{
if (op_size < 0)
SQRT_OF_NEGATIVE;
SIZ(root) = 0;
SIZ(rem) = 0;
return;
}
rem_ptr = MPZ_REALLOC (rem, op_size);
/* The size of the root is accurate after this simple calculation. */
root_size = (op_size + 1) / 2;
SIZ (root) = root_size;
op_ptr = PTR (op);
if (root == op)
{
/* Allocate temp space for the root, which we then copy to the
shared OP/ROOT variable. */
TMP_DECL;
TMP_MARK;
root_ptr = TMP_ALLOC_LIMBS (root_size);
rem_size = mpn_sqrtrem (root_ptr, rem_ptr, op_ptr, op_size);
if (rem != root) /* Don't overwrite remainder */
MPN_COPY (op_ptr, root_ptr, root_size);
TMP_FREE;
}
else
{
root_ptr = MPZ_REALLOC (root, root_size);
rem_size = mpn_sqrtrem (root_ptr, rem_ptr, op_ptr, op_size);
}
/* Write remainder size last, to make this function give only the square root
remainder, when passed ROOT == REM. */
SIZ (rem) = rem_size;
}
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