lzcntintrin.h revision 280031
1/*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------=== 2 * 3 * Permission is hereby granted, free of charge, to any person obtaining a copy 4 * of this software and associated documentation files (the "Software"), to deal 5 * in the Software without restriction, including without limitation the rights 6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 * copies of the Software, and to permit persons to whom the Software is 8 * furnished to do so, subject to the following conditions: 9 * 10 * The above copyright notice and this permission notice shall be included in 11 * all copies or substantial portions of the Software. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 19 * THE SOFTWARE. 20 * 21 *===-----------------------------------------------------------------------=== 22 */ 23 24#if !defined __X86INTRIN_H && !defined __IMMINTRIN_H 25#error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead." 26#endif 27 28#ifndef __LZCNT__ 29# error "LZCNT instruction is not enabled" 30#endif /* __LZCNT__ */ 31 32#ifndef __LZCNTINTRIN_H 33#define __LZCNTINTRIN_H 34 35static __inline__ unsigned short __attribute__((__always_inline__, __nodebug__)) 36__lzcnt16(unsigned short __X) 37{ 38 return __X ? __builtin_clzs(__X) : 16; 39} 40 41static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__)) 42__lzcnt32(unsigned int __X) 43{ 44 return __X ? __builtin_clz(__X) : 32; 45} 46 47static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__)) 48_lzcnt_u32(unsigned int __X) 49{ 50 return __X ? __builtin_clz(__X) : 32; 51} 52 53#ifdef __x86_64__ 54static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__)) 55__lzcnt64(unsigned long long __X) 56{ 57 return __X ? __builtin_clzll(__X) : 64; 58} 59 60static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__)) 61_lzcnt_u64(unsigned long long __X) 62{ 63 return __X ? __builtin_clzll(__X) : 64; 64} 65#endif 66 67#endif /* __LZCNTINTRIN_H */ 68