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/* Copyright (C) 2010-2016 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>
#ifdef _MSC_VER
#include <intrin.h>
#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 */
#if defined(__GNUC__) && !defined(RARCH_CONSOLE)
static INLINE int compat_ctz(unsigned x)
{
return __builtin_ctz(x);
}
#elif _MSC_VER >= 1400
static INLINE int compat_ctz(unsigned x)
{
unsigned long r = 0;
_BitScanReverse((unsigned long*)&r, x);
return (int)r;
}
#else
/* Only checks at nibble granularity,
* because that's what we need. */
static INLINE int compat_ctz(unsigned x)
{
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
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