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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>
146 lines
3.2 KiB
C
146 lines
3.2 KiB
C
/* mpn_addmul_1 -- multiply the N long limb vector pointed to by UP by VL,
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add the N least significant limbs of the product to the limb vector
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pointed to by RP. Return the most significant limb of the product,
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adjusted for carry-out from the addition.
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Copyright 1992-1994, 1996, 2000, 2002, 2004, 2016 Free Software Foundation,
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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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#include "longlong.h"
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#if GMP_NAIL_BITS == 0
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mp_limb_t
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mpn_addmul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t v0)
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{
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mp_limb_t u0, crec, c, p1, p0, r0;
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ASSERT (n >= 1);
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ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
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crec = 0;
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do
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{
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u0 = *up++;
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umul_ppmm (p1, p0, u0, v0);
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r0 = *rp;
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p0 = r0 + p0;
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c = r0 > p0;
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p1 = p1 + c;
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r0 = p0 + crec; /* cycle 0, 3, ... */
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c = p0 > r0; /* cycle 1, 4, ... */
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crec = p1 + c; /* cycle 2, 5, ... */
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*rp++ = r0;
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}
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while (--n != 0);
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return crec;
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}
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#endif
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#if GMP_NAIL_BITS == 1
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mp_limb_t
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mpn_addmul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t v0)
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{
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mp_limb_t shifted_v0, u0, r0, p0, p1, prev_p1, crec, xl, c1, c2, c3;
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ASSERT (n >= 1);
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ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
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ASSERT_MPN (rp, n);
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ASSERT_MPN (up, n);
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ASSERT_LIMB (v0);
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shifted_v0 = v0 << GMP_NAIL_BITS;
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crec = 0;
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prev_p1 = 0;
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do
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{
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u0 = *up++;
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r0 = *rp;
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umul_ppmm (p1, p0, u0, shifted_v0);
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p0 >>= GMP_NAIL_BITS;
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ADDC_LIMB (c1, xl, prev_p1, p0);
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ADDC_LIMB (c2, xl, xl, r0);
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ADDC_LIMB (c3, xl, xl, crec);
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crec = c1 + c2 + c3;
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*rp++ = xl;
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prev_p1 = p1;
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}
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while (--n != 0);
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return prev_p1 + crec;
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}
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#endif
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#if GMP_NAIL_BITS >= 2
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mp_limb_t
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mpn_addmul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t v0)
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{
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mp_limb_t shifted_v0, u0, r0, p0, p1, prev_p1, xw, crec, xl;
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ASSERT (n >= 1);
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ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
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ASSERT_MPN (rp, n);
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ASSERT_MPN (up, n);
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ASSERT_LIMB (v0);
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shifted_v0 = v0 << GMP_NAIL_BITS;
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crec = 0;
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prev_p1 = 0;
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do
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{
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u0 = *up++;
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r0 = *rp;
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umul_ppmm (p1, p0, u0, shifted_v0);
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p0 >>= GMP_NAIL_BITS;
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xw = prev_p1 + p0 + r0 + crec;
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crec = xw >> GMP_NUMB_BITS;
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xl = xw & GMP_NUMB_MASK;
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*rp++ = xl;
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prev_p1 = p1;
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}
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while (--n != 0);
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return prev_p1 + crec;
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}
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#endif
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