mirror of
https://review.haiku-os.org/buildtools
synced 2025-02-15 18:27:49 +01:00
4c74403188
Change-Id: Iae65e95cfa0d92091b8b0a424ae36d88efa76aa9 Reviewed-on: https://review.haiku-os.org/c/buildtools/+/3020 Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
/* mpn_bdiv_q_1, mpn_pi1_bdiv_q_1 -- schoolbook Hensel division by 1-limb
|
|
divisor, returning quotient only.
|
|
|
|
THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY. THEY'RE ALMOST
|
|
CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
|
|
FUTURE GNU MP RELEASES.
|
|
|
|
Copyright 2000-2003, 2005, 2009, 2017 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"
|
|
#include "longlong.h"
|
|
|
|
mp_limb_t
|
|
mpn_pi1_bdiv_q_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t d,
|
|
mp_limb_t di, int shift)
|
|
{
|
|
mp_size_t i;
|
|
mp_limb_t c, h, l, u, u_next, dummy;
|
|
|
|
ASSERT (n >= 1);
|
|
ASSERT (d != 0);
|
|
ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
|
|
ASSERT_MPN (up, n);
|
|
ASSERT_LIMB (d);
|
|
|
|
d <<= GMP_NAIL_BITS;
|
|
|
|
if (shift != 0)
|
|
{
|
|
c = 0;
|
|
|
|
u = up[0];
|
|
rp--;
|
|
for (i = 1; i < n; i++)
|
|
{
|
|
u_next = up[i];
|
|
u = ((u >> shift) | (u_next << (GMP_NUMB_BITS-shift))) & GMP_NUMB_MASK;
|
|
|
|
SUBC_LIMB (c, l, u, c);
|
|
|
|
l = (l * di) & GMP_NUMB_MASK;
|
|
rp[i] = l;
|
|
|
|
umul_ppmm (h, dummy, l, d);
|
|
c += h;
|
|
u = u_next;
|
|
}
|
|
|
|
u = u >> shift;
|
|
SUBC_LIMB (c, l, u, c);
|
|
|
|
l = (l * di) & GMP_NUMB_MASK;
|
|
rp[n] = l;
|
|
}
|
|
else
|
|
{
|
|
u = up[0];
|
|
l = (u * di) & GMP_NUMB_MASK;
|
|
rp[0] = l;
|
|
c = 0;
|
|
|
|
for (i = 1; i < n; i++)
|
|
{
|
|
umul_ppmm (h, dummy, l, d);
|
|
c += h;
|
|
|
|
u = up[i];
|
|
SUBC_LIMB (c, l, u, c);
|
|
|
|
l = (l * di) & GMP_NUMB_MASK;
|
|
rp[i] = l;
|
|
}
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
mp_limb_t
|
|
mpn_bdiv_q_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t d)
|
|
{
|
|
mp_limb_t di;
|
|
int shift;
|
|
|
|
ASSERT (n >= 1);
|
|
ASSERT (d != 0);
|
|
ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
|
|
ASSERT_MPN (up, n);
|
|
ASSERT_LIMB (d);
|
|
|
|
count_trailing_zeros (shift, d);
|
|
d >>= shift;
|
|
|
|
binvert_limb (di, d);
|
|
return mpn_pi1_bdiv_q_1 (rp, up, n, d, di, shift);
|
|
}
|