mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-15 07:15:12 +01:00
86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
|
/* Copyright (C) 2010-2017 The RetroArch team
|
||
|
|
*
|
||
|
|
* ---------------------------------------------------------------------------------------
|
||
|
|
* The following license statement only applies to this file (intrinsics.h).
|
||
|
|
* ---------------------------------------------------------------------------------------
|
||
|
|
*
|
||
|
|
* Permission is hereby granted, free of charge,
|
||
|
|
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
|
||
|
|
* to deal in the Software without restriction, including without limitation the rights to
|
||
|
|
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
|
||
|
|
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
|
||
|
|
*
|
||
|
|
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
|
||
|
|
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
||
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||
|
|
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __LIBRETRO_SDK_COMPAT_INTRINSICS_H
|
||
|
|
#define __LIBRETRO_SDK_COMPAT_INTRINSICS_H
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include <retro_common_api.h>
|
||
|
|
#include <retro_inline.h>
|
||
|
|
|
||
|
|
#if defined(_MSC_VER) && !defined(_XBOX)
|
||
|
|
#if (_MSC_VER > 1310)
|
||
|
|
#include <intrin.h>
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
RETRO_BEGIN_DECLS
|
||
|
|
|
||
|
|
/* Count Leading Zero, unsigned 16bit input value */
|
||
|
|
static INLINE unsigned compat_clz_u16(uint16_t val)
|
||
|
|
{
|
||
|
|
#ifdef __GNUC__
|
||
|
|
return __builtin_clz(val << 16 | 0x8000);
|
||
|
|
#else
|
||
|
|
unsigned ret = 0;
|
||
|
|
|
||
|
|
while(!(val & 0x8000) && ret < 16)
|
||
|
|
{
|
||
|
|
val <<= 1;
|
||
|
|
ret++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Count Trailing Zero */
|
||
|
|
static INLINE int compat_ctz(unsigned x)
|
||
|
|
{
|
||
|
|
#if defined(__GNUC__) && !defined(RARCH_CONSOLE)
|
||
|
|
return __builtin_ctz(x);
|
||
|
|
#elif _MSC_VER >= 1400
|
||
|
|
unsigned long r = 0;
|
||
|
|
_BitScanReverse((unsigned long*)&r, x);
|
||
|
|
return (int)r;
|
||
|
|
#else
|
||
|
|
/* Only checks at nibble granularity,
|
||
|
|
* because that's what we need. */
|
||
|
|
if (x & 0x000f)
|
||
|
|
return 0;
|
||
|
|
if (x & 0x00f0)
|
||
|
|
return 4;
|
||
|
|
if (x & 0x0f00)
|
||
|
|
return 8;
|
||
|
|
if (x & 0xf000)
|
||
|
|
return 12;
|
||
|
|
return 16;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
RETRO_END_DECLS
|
||
|
|
|
||
|
|
#endif
|