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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>
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/* mpn_div_qr_2u_pi1
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Contributed to the GNU project by Niels Möller
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THIS FILE CONTAINS INTERNAL FUNCTIONS WITH MUTABLE INTERFACES. IT IS ONLY
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SAFE TO REACH THEM THROUGH DOCUMENTED INTERFACES. IN FACT, IT IS ALMOST
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GUARANTEED THAT THEY'LL CHANGE OR DISAPPEAR IN A FUTURE GNU MP RELEASE.
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Copyright 2011 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 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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/* 3/2 loop, for unnormalized divisor. Caller must pass shifted d1 and
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d0, while {np,nn} is shifted on the fly. */
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mp_limb_t
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mpn_div_qr_2u_pi1 (mp_ptr qp, mp_ptr rp, mp_srcptr np, mp_size_t nn,
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mp_limb_t d1, mp_limb_t d0, int shift, mp_limb_t di)
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{
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mp_limb_t qh;
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mp_limb_t r2, r1, r0;
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mp_size_t i;
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ASSERT (nn >= 2);
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ASSERT (d1 & GMP_NUMB_HIGHBIT);
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ASSERT (shift > 0);
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r2 = np[nn-1] >> (GMP_LIMB_BITS - shift);
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r1 = (np[nn-1] << shift) | (np[nn-2] >> (GMP_LIMB_BITS - shift));
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r0 = np[nn-2] << shift;
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udiv_qr_3by2 (qh, r2, r1, r2, r1, r0, d1, d0, di);
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for (i = nn - 2 - 1; i >= 0; i--)
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{
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mp_limb_t q;
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r0 = np[i];
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r1 |= r0 >> (GMP_LIMB_BITS - shift);
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r0 <<= shift;
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udiv_qr_3by2 (q, r2, r1, r2, r1, r0, d1, d0, di);
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qp[i] = q;
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}
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rp[0] = (r1 >> shift) | (r2 << (GMP_LIMB_BITS - shift));
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rp[1] = r2 >> shift;
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return qh;
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}
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