Commit | Line | Data |
---|---|---|
3719602c PC |
1 | /* Copyright (C) 2010-2020 The RetroArch team |
2 | * | |
3 | * --------------------------------------------------------------------------------------- | |
4 | * The following license statement only applies to this file (intrinsics.h). | |
5 | * --------------------------------------------------------------------------------------- | |
6 | * | |
7 | * Permission is hereby granted, free of charge, | |
8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), | |
9 | * to deal in the Software without restriction, including without limitation the rights to | |
10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, | |
16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
21 | */ | |
22 | ||
23 | #ifndef __LIBRETRO_SDK_COMPAT_INTRINSICS_H | |
24 | #define __LIBRETRO_SDK_COMPAT_INTRINSICS_H | |
25 | ||
26 | #include <stdint.h> | |
27 | #include <stddef.h> | |
28 | #include <string.h> | |
29 | ||
30 | #include <retro_common_api.h> | |
31 | #include <retro_inline.h> | |
32 | ||
33 | #if defined(_MSC_VER) && !defined(_XBOX) | |
34 | #if (_MSC_VER > 1310) | |
35 | #include <intrin.h> | |
36 | #endif | |
37 | #endif | |
38 | ||
39 | RETRO_BEGIN_DECLS | |
40 | ||
41 | /* Count Leading Zero, unsigned 16bit input value */ | |
42 | static INLINE unsigned compat_clz_u16(uint16_t val) | |
43 | { | |
44 | #if defined(__GNUC__) | |
45 | return __builtin_clz(val << 16 | 0x8000); | |
46 | #else | |
47 | unsigned ret = 0; | |
48 | ||
49 | while(!(val & 0x8000) && ret < 16) | |
50 | { | |
51 | val <<= 1; | |
52 | ret++; | |
53 | } | |
54 | ||
55 | return ret; | |
56 | #endif | |
57 | } | |
58 | ||
59 | /* Count Trailing Zero */ | |
60 | static INLINE int compat_ctz(unsigned x) | |
61 | { | |
62 | #if defined(__GNUC__) && !defined(RARCH_CONSOLE) | |
63 | return __builtin_ctz(x); | |
64 | #elif _MSC_VER >= 1400 && !defined(_XBOX) && !defined(__WINRT__) | |
65 | unsigned long r = 0; | |
66 | _BitScanForward((unsigned long*)&r, x); | |
67 | return (int)r; | |
68 | #else | |
69 | int count = 0; | |
70 | if (!(x & 0xffff)) | |
71 | { | |
72 | x >>= 16; | |
73 | count |= 16; | |
74 | } | |
75 | if (!(x & 0xff)) | |
76 | { | |
77 | x >>= 8; | |
78 | count |= 8; | |
79 | } | |
80 | if (!(x & 0xf)) | |
81 | { | |
82 | x >>= 4; | |
83 | count |= 4; | |
84 | } | |
85 | if (!(x & 0x3)) | |
86 | { | |
87 | x >>= 2; | |
88 | count |= 2; | |
89 | } | |
90 | if (!(x & 0x1)) | |
91 | count |= 1; | |
92 | ||
93 | return count; | |
94 | #endif | |
95 | } | |
96 | ||
97 | RETRO_END_DECLS | |
98 | ||
99 | #endif |