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Diffstat (limited to 'Build/source/libs/gmp/gmp-6.0.0/mpn/generic/submul_1.c')
-rw-r--r-- | Build/source/libs/gmp/gmp-6.0.0/mpn/generic/submul_1.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpn/generic/submul_1.c b/Build/source/libs/gmp/gmp-6.0.0/mpn/generic/submul_1.c new file mode 100644 index 00000000000..fbc3501389d --- /dev/null +++ b/Build/source/libs/gmp/gmp-6.0.0/mpn/generic/submul_1.c @@ -0,0 +1,139 @@ +/* mpn_submul_1 -- multiply the N long limb vector pointed to by UP by VL, + subtract the N least significant limbs of the product from the limb + vector pointed to by RP. Return the most significant limb of the + product, adjusted for carry-out from the subtraction. + +Copyright 1992-1994, 1996, 2000, 2002, 2004 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.h" +#include "gmp-impl.h" +#include "longlong.h" + + +#if GMP_NAIL_BITS == 0 + +mp_limb_t +mpn_submul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl) +{ + mp_limb_t ul, cl, hpl, lpl, rl; + + ASSERT (n >= 1); + ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n)); + + cl = 0; + do + { + ul = *up++; + umul_ppmm (hpl, lpl, ul, vl); + + lpl += cl; + cl = (lpl < cl) + hpl; + + rl = *rp; + lpl = rl - lpl; + cl += lpl > rl; + *rp++ = lpl; + } + while (--n != 0); + + return cl; +} + +#endif + +#if GMP_NAIL_BITS == 1 + +mp_limb_t +mpn_submul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl) +{ + mp_limb_t shifted_vl, ul, rl, lpl, hpl, prev_hpl, cl, xl, c1, c2, c3; + + ASSERT (n >= 1); + ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n)); + ASSERT_MPN (rp, n); + ASSERT_MPN (up, n); + ASSERT_LIMB (vl); + + shifted_vl = vl << GMP_NAIL_BITS; + cl = 0; + prev_hpl = 0; + do + { + ul = *up++; + rl = *rp; + umul_ppmm (hpl, lpl, ul, shifted_vl); + lpl >>= GMP_NAIL_BITS; + SUBC_LIMB (c1, xl, rl, prev_hpl); + SUBC_LIMB (c2, xl, xl, lpl); + SUBC_LIMB (c3, xl, xl, cl); + cl = c1 + c2 + c3; + *rp++ = xl; + prev_hpl = hpl; + } + while (--n != 0); + + return prev_hpl + cl; +} + +#endif + +#if GMP_NAIL_BITS >= 2 + +mp_limb_t +mpn_submul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl) +{ + mp_limb_t shifted_vl, ul, rl, lpl, hpl, prev_hpl, xw, cl, xl; + + ASSERT (n >= 1); + ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n)); + ASSERT_MPN (rp, n); + ASSERT_MPN (up, n); + ASSERT_LIMB (vl); + + shifted_vl = vl << GMP_NAIL_BITS; + cl = 0; + prev_hpl = 0; + do + { + ul = *up++; + rl = *rp; + umul_ppmm (hpl, lpl, ul, shifted_vl); + lpl >>= GMP_NAIL_BITS; + xw = rl - (prev_hpl + lpl) + cl; + cl = (mp_limb_signed_t) xw >> GMP_NUMB_BITS; /* FIXME: non-portable */ + xl = xw & GMP_NUMB_MASK; + *rp++ = xl; + prev_hpl = hpl; + } + while (--n != 0); + + return prev_hpl - cl; +} + +#endif |