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f6a83b4a | 1 | /* Shift functions for the GCC support library for the MSP430 |
818ab71a | 2 | Copyright (C) 2011-2016 Free Software Foundation, Inc. |
f6a83b4a DD |
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 | \f | |
26 | typedef int sint32_type __attribute__ ((mode (SI))); | |
27 | typedef unsigned int uint32_type __attribute__ ((mode (SI))); | |
28 | typedef int sint16_type __attribute__ ((mode (HI))); | |
29 | typedef unsigned int uint16_type __attribute__ ((mode (HI))); | |
30 | ||
2de1cf8c NC |
31 | uint32_type __ashlsi3 (uint32_type, signed char); |
32 | sint32_type __ashrsi3 (sint32_type, signed char); | |
33 | int __clrsbhi2 (sint16_type); | |
34 | extern int __clrsbsi2 (sint32_type); | |
f6a83b4a DD |
35 | |
36 | typedef struct | |
37 | { | |
38 | union | |
39 | { | |
40 | uint32_type u; | |
41 | uint16_type h[2]; | |
42 | } u; | |
43 | } dd; | |
44 | ||
45 | uint32_type | |
2de1cf8c | 46 | __ashlsi3 (uint32_type in, signed char bit) |
f6a83b4a DD |
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 | ||
79 | sint32_type | |
2de1cf8c | 80 | __ashrsi3 (sint32_type in, signed char bit) |
f6a83b4a DD |
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 | ||
107 | int | |
108 | __clrsbhi2 (sint16_type x) | |
109 | { | |
110 | if (x == 0) | |
111 | return 15; | |
112 | return __clrsbsi2 ((sint32_type) x) - 16; | |
113 | } |