lib2funcs.c revision 1.1.1.1 
1/* libgcc routines for ARC
2   Copyright (C) 2019 Free Software Foundation, Inc.
3
4   This file is part of GCC.
5
6   GCC is free software; you can redistribute it and/or modify it
7   under the terms of the GNU General Public License as published
8   by the Free Software Foundation; either version 3, or (at your
9   option) any later version.
10
11   GCC is distributed in the hope that it will be useful, but WITHOUT
12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
14   License for more details.
15
16   Under Section 7 of GPL version 3, you are granted additional
17   permissions described in the GCC Runtime Library Exception, version
18   3.1, as published by the Free Software Foundation.
19
20   You should have received a copy of the GNU General Public License and
21   a copy of the GCC Runtime Library Exception along with this program;
22   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23   <http://www.gnu.org/licenses/>.  */
24
25
26typedef          int  sint64_t   __attribute__ ((mode (DI)));
27typedef unsigned int  uint64_t   __attribute__ ((mode (DI)));
28typedef unsigned int  nint32_t   __attribute__ ((mode (SI)));
29typedef int           word_t     __attribute__ ((mode (__word__)));
30
31sint64_t __muldi3 (sint64_t, sint64_t);
32nint32_t __umodsi3 (nint32_t, nint32_t);
33
34#ifdef __ARC_RF16__
35
36/* Generic multiplication procedure. No mpy operation involved.  */
37sint64_t
38__muldi3 (sint64_t a, sint64_t b)
39{
40  sint64_t res = 0;
41  uint64_t cnt = a;
42
43  while (cnt)
44    {
45      if (cnt & 1)
46        res += b;
47      b <<= 1;
48      cnt >>= 1;
49    }
50  return res;
51}
52
53/* Unsigned 32bit integer division/modulus.  */
54
55static inline __attribute__ ((__always_inline__))
56nint32_t
57udivmodsi4 (nint32_t num, nint32_t den, word_t modwanted)
58{
59  nint32_t bit = 1;
60  nint32_t res = 0;
61
62  while (den < num && bit && !(den & (1LL << 63)))
63    {
64      den <<= 1;
65      bit <<= 1;
66    }
67  while (bit)
68    {
69      if (num >= den)
70	{
71	  num -= den;
72	  res |= bit;
73	}
74      bit >>= 1;
75      den >>= 1;
76    }
77  if (modwanted)
78    return num;
79  return res;
80}
81
82nint32_t
83__umodsi3 (nint32_t a, nint32_t b)
84{
85  return udivmodsi4 (a, b, 1);
86}
87
88#endif
89