12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485 |
- /* Copyright (C) 2010-2018 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)
- {
- #if defined(__GNUC__) && !defined(PS2)
- 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 && !defined(_XBOX) && !defined(__WINRT__)
- 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
|