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4c74403188
Change-Id: Iae65e95cfa0d92091b8b0a424ae36d88efa76aa9 Reviewed-on: https://review.haiku-os.org/c/buildtools/+/3020 Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/* mpz_sqrtrem(root,rem,x) -- Set ROOT to floor(sqrt(X)) and REM
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to the remainder, i.e. X - ROOT**2.
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Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2005, 2011, 2012, 2015 Free
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Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp-impl.h"
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void
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mpz_sqrtrem (mpz_ptr root, mpz_ptr rem, mpz_srcptr op)
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{
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mp_size_t op_size, root_size, rem_size;
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mp_ptr root_ptr, op_ptr, rem_ptr;
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op_size = SIZ (op);
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if (UNLIKELY (op_size <= 0))
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{
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if (UNLIKELY (op_size < 0))
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SQRT_OF_NEGATIVE;
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SIZ(root) = 0;
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SIZ(rem) = 0;
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return;
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}
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/* No-op if rem == op */
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rem_ptr = MPZ_NEWALLOC (rem, op_size);
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/* The size of the root is accurate after this simple calculation. */
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root_size = (op_size + 1) / 2;
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SIZ (root) = root_size;
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op_ptr = PTR (op);
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if (root == op)
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{
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/* Allocate temp space for the root, which we then copy to the
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shared OP/ROOT variable. */
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TMP_DECL;
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TMP_MARK;
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root_ptr = TMP_ALLOC_LIMBS (root_size);
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rem_size = mpn_sqrtrem (root_ptr, rem_ptr, op_ptr, op_size);
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if (rem != root) /* Don't overwrite remainder */
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MPN_COPY (op_ptr, root_ptr, root_size);
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TMP_FREE;
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}
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else
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{
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root_ptr = MPZ_NEWALLOC (root, root_size);
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rem_size = mpn_sqrtrem (root_ptr, rem_ptr, op_ptr, op_size);
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}
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/* Write remainder size last, to make this function give only the square root
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remainder, when passed ROOT == REM. */
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SIZ (rem) = rem_size;
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}
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