flint-sys 0.9.0

Bindings to the FLINT C library
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97

/*
    Copyright (C) 2014 Fredrik Johansson

    This file is part of FLINT.

    FLINT is free software: you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.  See <https://www.gnu.org/licenses/>.
*/

#include "arf.h"

#define ARF_USE_CACHE 0

#define ARF_MAX_CACHE_LIMBS 64

FLINT_TLS_PREFIX nn_ptr * arf_free_arr = NULL;
FLINT_TLS_PREFIX ulong arf_free_num = 0;
FLINT_TLS_PREFIX ulong arf_free_alloc = 0;
FLINT_TLS_PREFIX int arf_have_registered_cleanup = 0;

static void _arf_cleanup(void)
{
    slong i;
    for (i = 0; i < arf_free_num; i++)
        flint_free(arf_free_arr[i]);

    flint_free(arf_free_arr);

    arf_free_arr = NULL;
    arf_free_num = 0;
    arf_free_alloc = 0;
}

void
_arf_promote(arf_t x, slong n)
{
    if (ARF_USE_CACHE && n <= ARF_MAX_CACHE_LIMBS && arf_free_num != 0)
    {
        nn_ptr ptr;
        slong alloc;

        ptr = arf_free_arr[--arf_free_num];
        alloc = ptr[0];

        if (alloc >= n)
        {
            ARF_PTR_ALLOC(x) = ptr[0];
            ARF_PTR_D(x) = ptr;
        }
        else
        {
            ptr = flint_realloc(ptr, n * sizeof(ulong));
            ARF_PTR_ALLOC(x) = n;
            ARF_PTR_D(x) = ptr;
        }
    }
    else
    {
        ARF_PTR_ALLOC(x) = n;
        ARF_PTR_D(x) = flint_malloc(n * sizeof(ulong));
    }
}

void
_arf_demote(arf_t x)
{
    nn_ptr ptr;
    slong alloc;

    alloc = ARF_PTR_ALLOC(x);
    ptr = ARF_PTR_D(x);

    if (ARF_USE_CACHE && alloc <= ARF_MAX_CACHE_LIMBS)
    {
        if (arf_free_num == arf_free_alloc)
        {
            if (!arf_have_registered_cleanup)
            {
                flint_register_cleanup_function(_arf_cleanup);
                arf_have_registered_cleanup = 1;
            }

            arf_free_alloc = FLINT_MAX(64, arf_free_alloc * 2);
            arf_free_arr = flint_realloc(arf_free_arr,
                arf_free_alloc * sizeof(nn_ptr));
        }

        ptr[0] = alloc;
        arf_free_arr[arf_free_num++] = ptr;
    }
    else
    {
        flint_free(ptr);
    }
}