lzcntintrin.h revision 302408
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 __LZCNTINTRIN_H 29#define __LZCNTINTRIN_H 30 31/* Define the default attributes for the functions in this file. */ 32#define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("lzcnt"))) 33 34static __inline__ unsigned short __DEFAULT_FN_ATTRS 35__lzcnt16(unsigned short __X) 36{ 37 return __X ? __builtin_clzs(__X) : 16; 38} 39 40static __inline__ unsigned int __DEFAULT_FN_ATTRS 41__lzcnt32(unsigned int __X) 42{ 43 return __X ? __builtin_clz(__X) : 32; 44} 45 46static __inline__ unsigned int __DEFAULT_FN_ATTRS 47_lzcnt_u32(unsigned int __X) 48{ 49 return __X ? __builtin_clz(__X) : 32; 50} 51 52#ifdef __x86_64__ 53static __inline__ unsigned long long __DEFAULT_FN_ATTRS 54__lzcnt64(unsigned long long __X) 55{ 56 return __X ? __builtin_clzll(__X) : 64; 57} 58 59static __inline__ unsigned long long __DEFAULT_FN_ATTRS 60_lzcnt_u64(unsigned long long __X) 61{ 62 return __X ? __builtin_clzll(__X) : 64; 63} 64#endif 65 66#undef __DEFAULT_FN_ATTRS 67 68#endif /* __LZCNTINTRIN_H */ 69