Coverage Report

Created: 2024-11-21 07:03

/src/libgmp/mpz/tdiv_q_ui.c
Line
Count
Source (jump to first uncovered line)
1
/* mpz_tdiv_q_ui(quot, dividend, divisor_limb)
2
   -- Divide DIVIDEND by DIVISOR_LIMB and store the result in QUOT.
3
4
Copyright 1991, 1993, 1994, 1996, 1998, 2001, 2002, 2004, 2012 Free Software
5
Foundation, Inc.
6
7
This file is part of the GNU MP Library.
8
9
The GNU MP Library is free software; you can redistribute it and/or modify
10
it under the terms of either:
11
12
  * the GNU Lesser General Public License as published by the Free
13
    Software Foundation; either version 3 of the License, or (at your
14
    option) any later version.
15
16
or
17
18
  * the GNU General Public License as published by the Free Software
19
    Foundation; either version 2 of the License, or (at your option) any
20
    later version.
21
22
or both in parallel, as here.
23
24
The GNU MP Library is distributed in the hope that it will be useful, but
25
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
26
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
27
for more details.
28
29
You should have received copies of the GNU General Public License and the
30
GNU Lesser General Public License along with the GNU MP Library.  If not,
31
see https://www.gnu.org/licenses/.  */
32
33
#include "gmp-impl.h"
34
35
unsigned long int
36
mpz_tdiv_q_ui (mpz_ptr quot, mpz_srcptr dividend, unsigned long int divisor)
37
1.24k
{
38
1.24k
  mp_size_t ns, nn, qn;
39
1.24k
  mp_ptr np, qp;
40
1.24k
  mp_limb_t rl;
41
42
1.24k
  if (UNLIKELY (divisor == 0))
43
0
    DIVIDE_BY_ZERO;
44
45
1.24k
  ns = SIZ(dividend);
46
1.24k
  if (ns == 0)
47
0
    {
48
0
      SIZ(quot) = 0;
49
0
      return 0;
50
0
    }
51
52
1.24k
  nn = ABS(ns);
53
1.24k
  qp = MPZ_REALLOC (quot, nn);
54
1.24k
  np = PTR(dividend);
55
56
#if BITS_PER_ULONG > GMP_NUMB_BITS  /* avoid warnings about shift amount */
57
  if (divisor > GMP_NUMB_MAX)
58
    {
59
      mp_limb_t dp[2], rp[2];
60
61
      if (nn == 1)    /* tdiv_qr requirements; tested above for 0 */
62
  {
63
    SIZ(quot) = 0;
64
    rl = np[0];
65
    return rl;
66
  }
67
68
      dp[0] = divisor & GMP_NUMB_MASK;
69
      dp[1] = divisor >> GMP_NUMB_BITS;
70
      mpn_tdiv_qr (qp, rp, (mp_size_t) 0, np, nn, dp, (mp_size_t) 2);
71
      rl = rp[0] + (rp[1] << GMP_NUMB_BITS);
72
      qn = nn - 2 + 1; qn -= qp[qn - 1] == 0; qn -= qn != 0 && qp[qn - 1] == 0;
73
    }
74
  else
75
#endif
76
1.24k
    {
77
1.24k
      rl = mpn_divrem_1 (qp, (mp_size_t) 0, np, nn, (mp_limb_t) divisor);
78
1.24k
      qn = nn - (qp[nn - 1] == 0);
79
1.24k
    }
80
81
1.24k
  SIZ(quot) = ns >= 0 ? qn : -qn;
82
1.24k
  return rl;
83
1.24k
}