1/* Shift functions for the GCC support library for the MSP430
2   Copyright (C) 2011-2022 Free Software Foundation, Inc.
3   Contributed by Red Hat.
4
5   This file is part of GCC.
6
7   GCC is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3, or (at your option)
10   any later version.
11
12   GCC is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   Under Section 7 of GPL version 3, you are granted additional
18   permissions described in the GCC Runtime Library Exception, version
19   3.1, as published by the Free Software Foundation.
20
21   You should have received a copy of the GNU General Public License and
22   a copy of the GCC Runtime Library Exception along with this program;
23   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24   <http://www.gnu.org/licenses/>.  */
25
26typedef          int  sint32_type   __attribute__ ((mode (SI)));
27typedef unsigned int  uint32_type   __attribute__ ((mode (SI)));
28typedef          int  sint16_type   __attribute__ ((mode (HI)));
29typedef unsigned int  uint16_type   __attribute__ ((mode (HI)));
30
31uint32_type __ashlsi3 (uint32_type, signed char);
32sint32_type __ashrsi3 (sint32_type, signed char);
33int         __clrsbhi2 (sint16_type);
34extern int  __clrsbsi2 (sint32_type);
35
36typedef struct
37{
38  union
39  {
40    uint32_type u;
41    uint16_type h[2];
42  } u;
43} dd;
44
45uint32_type
46__ashlsi3 (uint32_type in, signed char bit)
47{
48  uint16_type h, l;
49  dd d;
50
51  if (bit > 32)
52    return 0;
53  if (bit < 0)
54    return in;
55
56  d.u.u = in;
57  h = d.u.h[1];
58  l = d.u.h[0];
59
60  if (bit > 15)
61    {
62      h = l;
63      l = 0;
64      bit -= 16;
65    }
66
67  while (bit)
68    {
69      h = (h << 1) | (l >> 15);
70      l <<= 1;
71      bit --;
72    }
73
74  d.u.h[1] = h;
75  d.u.h[0] = l;
76  return d.u.u;
77}
78
79sint32_type
80__ashrsi3 (sint32_type in, signed char bit)
81{
82  sint16_type h;
83  uint16_type l;
84  dd d;
85
86  if (bit > 32)
87    return 0;
88  if (bit < 0)
89    return in;
90
91  d.u.u = in;
92  h = d.u.h[1];
93  l = d.u.h[0];
94
95  while (bit)
96    {
97      l = (h << 15) | (l >> 1);
98      h >>= 1;
99      bit --;
100    }
101
102  d.u.h[1] = h;
103  d.u.h[0] = l;
104  return d.u.u;
105}
106
107int
108__clrsbhi2 (sint16_type x)
109{
110  if (x == 0)
111    return 15;
112  return __clrsbsi2 ((sint32_type) x) - 16;
113}
114