RetroArch
intrinsics.h
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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 
40 
41 /* Count Leading Zero, unsigned 16bit input value */
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 */
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)
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 
84 
85 #endif
static RETRO_BEGIN_DECLS INLINE unsigned compat_clz_u16(uint16_t val)
Definition: intrinsics.h:42
GLuint GLfloat * val
Definition: glext.h:7847
#define INLINE
Definition: retro_inline.h:35
#define RETRO_BEGIN_DECLS
Definition: retro_common_api.h:41
GLdouble GLdouble GLdouble r
Definition: glext.h:6406
static INLINE int compat_ctz(unsigned x)
Definition: intrinsics.h:60
GLint GLint GLint GLint GLint x
Definition: glext.h:6295
#define RETRO_END_DECLS
Definition: retro_common_api.h:42
unsigned short uint16_t
Definition: stdint.h:125