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 #ifndef _MSC_VER 35 /// Counts the number of leading zero bits in the operand. 36 /// 37 /// \headerfile <x86intrin.h> 38 /// 39 /// This intrinsic corresponds to the \c LZCNT instruction. 40 /// 41 /// \param __X 42 /// An unsigned 16-bit integer whose leading zeros are to be counted. 43 /// \returns An unsigned 16-bit integer containing the number of leading zero 44 /// bits in the operand. 45 #define __lzcnt16(X) __builtin_ia32_lzcnt_u16((unsigned short)(X)) 46 #endif // _MSC_VER 47 48 /// Counts the number of leading zero bits in the operand. 49 /// 50 /// \headerfile <x86intrin.h> 51 /// 52 /// This intrinsic corresponds to the \c LZCNT instruction. 53 /// 54 /// \param __X 55 /// An unsigned 32-bit integer whose leading zeros are to be counted. 56 /// \returns An unsigned 32-bit integer containing the number of leading zero 57 /// bits in the operand. 58 /// \see _lzcnt_u32 59 static __inline__ unsigned int __DEFAULT_FN_ATTRS 60 __lzcnt32(unsigned int __X) 61 { 62 return __builtin_ia32_lzcnt_u32(__X); 63 } 64 65 /// Counts the number of leading zero bits in the operand. 66 /// 67 /// \headerfile <x86intrin.h> 68 /// 69 /// This intrinsic corresponds to the \c LZCNT instruction. 70 /// 71 /// \param __X 72 /// An unsigned 32-bit integer whose leading zeros are to be counted. 73 /// \returns An unsigned 32-bit integer containing the number of leading zero 74 /// bits in the operand. 75 /// \see __lzcnt32 76 static __inline__ unsigned int __DEFAULT_FN_ATTRS 77 _lzcnt_u32(unsigned int __X) 78 { 79 return __builtin_ia32_lzcnt_u32(__X); 80 } 81 82 #ifdef __x86_64__ 83 #ifndef _MSC_VER 84 /// Counts the number of leading zero bits in the operand. 85 /// 86 /// \headerfile <x86intrin.h> 87 /// 88 /// This intrinsic corresponds to the \c LZCNT instruction. 89 /// 90 /// \param __X 91 /// An unsigned 64-bit integer whose leading zeros are to be counted. 92 /// \returns An unsigned 64-bit integer containing the number of leading zero 93 /// bits in the operand. 94 /// \see _lzcnt_u64 95 #define __lzcnt64(X) __builtin_ia32_lzcnt_u64((unsigned long long)(X)) 96 #endif // _MSC_VER 97 98 /// Counts the number of leading zero bits in the operand. 99 /// 100 /// \headerfile <x86intrin.h> 101 /// 102 /// This intrinsic corresponds to the \c LZCNT instruction. 103 /// 104 /// \param __X 105 /// An unsigned 64-bit integer whose leading zeros are to be counted. 106 /// \returns An unsigned 64-bit integer containing the number of leading zero 107 /// bits in the operand. 108 /// \see __lzcnt64 109 static __inline__ unsigned long long __DEFAULT_FN_ATTRS 110 _lzcnt_u64(unsigned long long __X) 111 { 112 return __builtin_ia32_lzcnt_u64(__X); 113 } 114 #endif 115 116 #undef __DEFAULT_FN_ATTRS 117 118 #endif /* __LZCNTINTRIN_H */ 119