diff options
Diffstat (limited to 'vendor/gmp-6.3.0/mpn/generic/mullo_basecase.c')
-rw-r--r-- | vendor/gmp-6.3.0/mpn/generic/mullo_basecase.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/vendor/gmp-6.3.0/mpn/generic/mullo_basecase.c b/vendor/gmp-6.3.0/mpn/generic/mullo_basecase.c new file mode 100644 index 0000000..9a4cd3d --- /dev/null +++ b/vendor/gmp-6.3.0/mpn/generic/mullo_basecase.c @@ -0,0 +1,90 @@ +/* mpn_mullo_basecase -- Internal routine to multiply two natural + numbers of length n and return the low part. + + THIS IS AN INTERNAL FUNCTION WITH A MUTABLE INTERFACE. IT IS ONLY + SAFE TO REACH THIS FUNCTION THROUGH DOCUMENTED INTERFACES. + + +Copyright (C) 2000, 2002, 2004, 2015 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 either: + + * 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. + +or + + * the GNU General Public License as published by the Free Software + Foundation; either version 2 of the License, or (at your option) any + later version. + +or both in parallel, as here. + +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 General Public License +for more details. + +You should have received copies of the GNU General Public License and the +GNU Lesser General Public License along with the GNU MP Library. If not, +see https://www.gnu.org/licenses/. */ + +#include "gmp-impl.h" + +/* FIXME: Should optionally use mpn_mul_2/mpn_addmul_2. */ + +#ifndef MULLO_VARIANT +#define MULLO_VARIANT 2 +#endif + + +#if MULLO_VARIANT == 1 +void +mpn_mullo_basecase (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n) +{ + mp_size_t i; + + mpn_mul_1 (rp, up, n, vp[0]); + + for (i = n - 1; i > 0; i--) + { + vp++; + rp++; + mpn_addmul_1 (rp, up, i, vp[0]); + } +} +#endif + + +#if MULLO_VARIANT == 2 +void +mpn_mullo_basecase (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n) +{ + mp_limb_t h; + + h = up[0] * vp[n - 1]; + + if (n != 1) + { + mp_size_t i; + mp_limb_t v0; + + v0 = *vp++; + h += up[n - 1] * v0 + mpn_mul_1 (rp, up, n - 1, v0); + rp++; + + for (i = n - 2; i > 0; i--) + { + v0 = *vp++; + h += up[i] * v0 + mpn_addmul_1 (rp, up, i, v0); + rp++; + } + } + + rp[0] = h; +} +#endif |