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05f778c8 TS |
1 | /* |
2 | * Utility compute operations used by translated code. | |
3 | * | |
4 | * Copyright (c) 2007 Thiemo Seufer | |
5 | * Copyright (c) 2007 Jocelyn Mayer | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
25 | ||
26 | /* Note that some of those functions may end up calling libgcc functions, | |
27 | depending on the host machine. It is up to the target emulation to | |
28 | cope with that. */ | |
29 | ||
30 | /* Binary search for leading zeros. */ | |
31 | ||
32 | static always_inline int clz32(uint32_t val) | |
33 | { | |
34 | int cnt = 0; | |
35 | ||
36 | if (!(val & 0xFFFF0000U)) { | |
37 | cnt += 16; | |
38 | val <<= 16; | |
39 | } | |
40 | if (!(val & 0xFF000000U)) { | |
41 | cnt += 8; | |
42 | val <<= 8; | |
43 | } | |
44 | if (!(val & 0xF0000000U)) { | |
45 | cnt += 4; | |
46 | val <<= 4; | |
47 | } | |
48 | if (!(val & 0xC0000000U)) { | |
49 | cnt += 2; | |
50 | val <<= 2; | |
51 | } | |
52 | if (!(val & 0x80000000U)) { | |
53 | cnt++; | |
54 | val <<= 1; | |
55 | } | |
56 | if (!(val & 0x80000000U)) { | |
57 | cnt++; | |
58 | } | |
59 | return cnt; | |
60 | } | |
61 | ||
62 | static always_inline int clo32(uint32_t val) | |
63 | { | |
64 | return clz32(~val); | |
65 | } | |
66 | ||
67 | static always_inline int clz64(uint64_t val) | |
68 | { | |
69 | int cnt = 0; | |
70 | ||
71 | if (!(val & 0xFFFFFFFF00000000ULL)) { | |
72 | cnt += 32; | |
73 | val <<= 32; | |
74 | } | |
75 | if (!(val & 0xFFFF000000000000ULL)) { | |
76 | cnt += 16; | |
77 | val <<= 16; | |
78 | } | |
79 | if (!(val & 0xFF00000000000000ULL)) { | |
80 | cnt += 8; | |
81 | val <<= 8; | |
82 | } | |
83 | if (!(val & 0xF000000000000000ULL)) { | |
84 | cnt += 4; | |
85 | val <<= 4; | |
86 | } | |
87 | if (!(val & 0xC000000000000000ULL)) { | |
88 | cnt += 2; | |
89 | val <<= 2; | |
90 | } | |
91 | if (!(val & 0x8000000000000000ULL)) { | |
92 | cnt++; | |
93 | val <<= 1; | |
94 | } | |
95 | if (!(val & 0x8000000000000000ULL)) { | |
96 | cnt++; | |
97 | } | |
98 | return cnt; | |
99 | } | |
100 | ||
101 | static always_inline int clo64(uint64_t val) | |
102 | { | |
103 | return clz64(~val); | |
104 | } |