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87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/* mpn_mul_n -- multiply natural numbers.
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Copyright 1991, 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
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2005, 2008, 2009 Free 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 the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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void
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mpn_mul_n (mp_ptr p, mp_srcptr a, mp_srcptr b, mp_size_t n)
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{
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ASSERT (n >= 1);
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ASSERT (! MPN_OVERLAP_P (p, 2 * n, a, n));
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ASSERT (! MPN_OVERLAP_P (p, 2 * n, b, n));
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if (BELOW_THRESHOLD (n, MUL_TOOM22_THRESHOLD))
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{
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mpn_mul_basecase (p, a, n, b, n);
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}
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else if (BELOW_THRESHOLD (n, MUL_TOOM33_THRESHOLD))
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{
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/* Allocate workspace of fixed size on stack: fast! */
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mp_limb_t ws[mpn_toom22_mul_itch (MUL_TOOM33_THRESHOLD_LIMIT-1,
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MUL_TOOM33_THRESHOLD_LIMIT-1)];
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ASSERT (MUL_TOOM33_THRESHOLD <= MUL_TOOM33_THRESHOLD_LIMIT);
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mpn_toom22_mul (p, a, n, b, n, ws);
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}
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else if (BELOW_THRESHOLD (n, MUL_TOOM44_THRESHOLD))
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{
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mp_ptr ws;
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TMP_SDECL;
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TMP_SMARK;
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ws = TMP_SALLOC_LIMBS (mpn_toom33_mul_itch (n, n));
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mpn_toom33_mul (p, a, n, b, n, ws);
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TMP_SFREE;
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}
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else if (BELOW_THRESHOLD (n, MUL_TOOM6H_THRESHOLD))
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{
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mp_ptr ws;
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TMP_SDECL;
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TMP_SMARK;
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ws = TMP_SALLOC_LIMBS (mpn_toom44_mul_itch (n, n));
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mpn_toom44_mul (p, a, n, b, n, ws);
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TMP_SFREE;
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}
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else if (BELOW_THRESHOLD (n, MUL_TOOM8H_THRESHOLD))
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{
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mp_ptr ws;
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TMP_SDECL;
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TMP_SMARK;
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ws = TMP_SALLOC_LIMBS (mpn_toom6_mul_n_itch (n));
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mpn_toom6h_mul (p, a, n, b, n, ws);
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TMP_SFREE;
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}
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else if (BELOW_THRESHOLD (n, MUL_FFT_THRESHOLD))
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{
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mp_ptr ws;
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TMP_DECL;
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TMP_MARK;
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ws = TMP_ALLOC_LIMBS (mpn_toom8_mul_n_itch (n));
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mpn_toom8h_mul (p, a, n, b, n, ws);
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TMP_FREE;
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}
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else
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{
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/* The current FFT code allocates its own space. That should probably
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change. */
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mpn_fft_mul (p, a, n, b, n);
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}
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}
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