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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>
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
/* mpf_div_ui -- Divide a float with an unsigned integer.
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Copyright 1993, 1994, 1996, 2000-2002, 2004, 2005, 2012 Free Software
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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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void
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mpf_div_ui (mpf_ptr r, mpf_srcptr u, unsigned long int v)
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{
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mp_srcptr up;
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mp_ptr rp, tp, rtp;
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mp_size_t usize;
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mp_size_t rsize, tsize;
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mp_size_t sign_quotient;
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mp_size_t prec;
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mp_limb_t q_limb;
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mp_exp_t rexp;
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TMP_DECL;
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#if BITS_PER_ULONG > GMP_NUMB_BITS /* avoid warnings about shift amount */
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if (v > GMP_NUMB_MAX)
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{
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mpf_t vf;
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mp_limb_t vl[2];
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SIZ(vf) = 2;
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EXP(vf) = 2;
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PTR(vf) = vl;
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vl[0] = v & GMP_NUMB_MASK;
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vl[1] = v >> GMP_NUMB_BITS;
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mpf_div (r, u, vf);
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return;
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}
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#endif
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if (UNLIKELY (v == 0))
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DIVIDE_BY_ZERO;
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usize = u->_mp_size;
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if (usize == 0)
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{
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r->_mp_size = 0;
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r->_mp_exp = 0;
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return;
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}
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sign_quotient = usize;
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usize = ABS (usize);
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prec = r->_mp_prec;
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TMP_MARK;
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rp = r->_mp_d;
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up = u->_mp_d;
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tsize = 1 + prec;
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tp = TMP_ALLOC_LIMBS (tsize + 1);
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if (usize > tsize)
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{
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up += usize - tsize;
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usize = tsize;
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rtp = tp;
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}
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else
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{
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MPN_ZERO (tp, tsize - usize);
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rtp = tp + (tsize - usize);
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}
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/* Move the dividend to the remainder. */
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MPN_COPY (rtp, up, usize);
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mpn_divmod_1 (rp, tp, tsize, (mp_limb_t) v);
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q_limb = rp[tsize - 1];
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rsize = tsize - (q_limb == 0);
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rexp = u->_mp_exp - (q_limb == 0);
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r->_mp_size = sign_quotient >= 0 ? rsize : -rsize;
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r->_mp_exp = rexp;
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TMP_FREE;
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}
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