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 34 static __inline__ unsigned short __DEFAULT_FN_ATTRS 35 __lzcnt16(unsigned short __X) 36 { 37 return __X ? __builtin_clzs(__X) : 16; 38 } 39 40 static __inline__ unsigned int __DEFAULT_FN_ATTRS 41 __lzcnt32(unsigned int __X) 42 { 43 return __X ? __builtin_clz(__X) : 32; 44 } 45 46 static __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__ 53 static __inline__ unsigned long long __DEFAULT_FN_ATTRS 54 __lzcnt64(unsigned long long __X) 55 { 56 return __X ? __builtin_clzll(__X) : 64; 57 } 58 59 static __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
