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 35 static __inline__ unsigned short __attribute__((__always_inline__, __nodebug__)) 36 __lzcnt16(unsigned short __X) 37 { 38 return __builtin_clzs(__X); 39 } 40 41 static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__)) 42 __lzcnt32(unsigned int __X) 43 { 44 return __builtin_clz(__X); 45 } 46 47 #ifdef __x86_64__ 48 static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__)) 49 __lzcnt64(unsigned long long __X) 50 { 51 return __builtin_clzll(__X); 52 } 53 #endif 54 55 #endif /* __LZCNTINTRIN_H */ 56
