1 /* Copyright (C) 2010-2018 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 */
compat_clz_u16(uint16_t val)42 static INLINE unsigned compat_clz_u16(uint16_t val)
43 {
44 #if defined(__GNUC__) && !defined(PS2)
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 */
compat_ctz(unsigned x)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 _BitScanReverse((unsigned long*)&r, x);
67 return (int)r;
68 #else
69 /* Only checks at nibble granularity,
70 * because that's what we need. */
71 if (x & 0x000f)
72 return 0;
73 if (x & 0x00f0)
74 return 4;
75 if (x & 0x0f00)
76 return 8;
77 if (x & 0xf000)
78 return 12;
79 return 16;
80 #endif
81 }
82
83 RETRO_END_DECLS
84
85 #endif
86