112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/* Copyright (C) 2010-2020 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (intrinsics.h).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __LIBRETRO_SDK_COMPAT_INTRINSICS_H
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#define __LIBRETRO_SDK_COMPAT_INTRINSICS_H
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#include <stdint.h>
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#include <stddef.h>
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#include <string.h>
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#include <retro_common_api.h>
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#include <retro_inline.h>
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#if defined(_MSC_VER) && !defined(_XBOX)
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#if (_MSC_VER > 1310)
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#include <intrin.h>
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#endif
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#endif
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RETRO_BEGIN_DECLS
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/**
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* Counts the leading zero bits in a \c uint16_t.
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* Uses compiler intrinsics if available, or a standard C implementation if not.
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*
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* @param val Value to count leading zeroes in.
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* @return Number of leading zeroes in \c val.
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*/
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static INLINE unsigned compat_clz_u16(uint16_t val)
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{
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#if defined(__GNUC__)
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return __builtin_clz(val << 16 | 0x8000);
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#else
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unsigned ret = 0;
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while(!(val & 0x8000) && ret < 16)
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{
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val <<= 1;
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ret++;
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}
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return ret;
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#endif
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}
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/**
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* Counts the trailing zero bits in a \c uint16_t.
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* Uses compiler intrinsics if available, or a standard C implementation if not.
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*
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* @param val Value to count trailing zeroes in.
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* @return Number of trailing zeroes in \c val.
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*/
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static INLINE int compat_ctz(unsigned x)
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{
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#if defined(__GNUC__) && !defined(RARCH_CONSOLE)
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return __builtin_ctz(x);
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#elif _MSC_VER >= 1400 && !defined(_XBOX) && !defined(__WINRT__)
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unsigned long r = 0;
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_BitScanForward((unsigned long*)&r, x);
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return (int)r;
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#else
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int count = 0;
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if (!(x & 0xffff))
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{
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x >>= 16;
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count |= 16;
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}
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if (!(x & 0xff))
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{
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x >>= 8;
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count |= 8;
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}
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if (!(x & 0xf))
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{
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x >>= 4;
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count |= 4;
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}
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if (!(x & 0x3))
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{
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x >>= 2;
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count |= 2;
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}
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if (!(x & 0x1))
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count |= 1;
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return count;
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#endif
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}
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RETRO_END_DECLS
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#endif
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