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╭ lzcntintrin.h ────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯

╭ find file ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╮ ╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │ │ │http│ ssh │ │ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╯ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯

1 /*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------=== 2 * 3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 * See https://llvm.org/LICENSE.txt for license information. 5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 * 7 *===-----------------------------------------------------------------------=== 8 */ 9 10 #if !defined __X86INTRIN_H && !defined __IMMINTRIN_H 11 #error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead." 12 #endif 13 14 #ifndef __LZCNTINTRIN_H 15 #define __LZCNTINTRIN_H 16 17 /* Define the default attributes for the functions in this file. 18 Allow using the lzcnt intrinsics even for non-LZCNT targets. Since the LZCNT 19 intrinsics are mapped to llvm.ctlz.*, false, which can be lowered to BSR on 20 non-LZCNT targets with zero-value input handled correctly. */ 21 #if defined(__cplusplus) && (__cplusplus >= 201103L) 22 #define __DEFAULT_FN_ATTRS \ 23 __attribute__((__always_inline__, __nodebug__)) constexpr 24 #else 25 #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__)) 26 #endif 27 28 #ifndef _MSC_VER 29 /// Counts the number of leading zero bits in the operand. 30 /// 31 /// \headerfile <x86intrin.h> 32 /// 33 /// This intrinsic corresponds to the \c LZCNT instruction. 34 /// 35 /// \param __X 36 /// An unsigned 16-bit integer whose leading zeros are to be counted. 37 /// \returns An unsigned 16-bit integer containing the number of leading zero 38 /// bits in the operand. 39 #define __lzcnt16(X) __builtin_ia32_lzcnt_u16((unsigned short)(X)) 40 #endif // _MSC_VER 41 42 /// Counts the number of leading zero bits in the operand. 43 /// 44 /// \headerfile <x86intrin.h> 45 /// 46 /// This intrinsic corresponds to the \c LZCNT instruction. 47 /// 48 /// \param __X 49 /// An unsigned 32-bit integer whose leading zeros are to be counted. 50 /// \returns An unsigned 32-bit integer containing the number of leading zero 51 /// bits in the operand. 52 /// \see _lzcnt_u32 53 static __inline__ unsigned int __DEFAULT_FN_ATTRS 54 __lzcnt32(unsigned int __X) { 55 return __builtin_ia32_lzcnt_u32(__X); 56 } 57 58 /// Counts the number of leading zero bits in the operand. 59 /// 60 /// \headerfile <x86intrin.h> 61 /// 62 /// This intrinsic corresponds to the \c LZCNT instruction. 63 /// 64 /// \param __X 65 /// An unsigned 32-bit integer whose leading zeros are to be counted. 66 /// \returns An unsigned 32-bit integer containing the number of leading zero 67 /// bits in the operand. 68 /// \see __lzcnt32 69 static __inline__ unsigned int __DEFAULT_FN_ATTRS 70 _lzcnt_u32(unsigned int __X) { 71 return __builtin_ia32_lzcnt_u32(__X); 72 } 73 74 #ifdef __x86_64__ 75 #ifndef _MSC_VER 76 /// Counts the number of leading zero bits in the operand. 77 /// 78 /// \headerfile <x86intrin.h> 79 /// 80 /// This intrinsic corresponds to the \c LZCNT instruction. 81 /// 82 /// \param __X 83 /// An unsigned 64-bit integer whose leading zeros are to be counted. 84 /// \returns An unsigned 64-bit integer containing the number of leading zero 85 /// bits in the operand. 86 /// \see _lzcnt_u64 87 #define __lzcnt64(X) __builtin_ia32_lzcnt_u64((unsigned long long)(X)) 88 #endif // _MSC_VER 89 90 /// Counts the number of leading zero bits in the operand. 91 /// 92 /// \headerfile <x86intrin.h> 93 /// 94 /// This intrinsic corresponds to the \c LZCNT instruction. 95 /// 96 /// \param __X 97 /// An unsigned 64-bit integer whose leading zeros are to be counted. 98 /// \returns An unsigned 64-bit integer containing the number of leading zero 99 /// bits in the operand. 100 /// \see __lzcnt64 101 static __inline__ unsigned long long __DEFAULT_FN_ATTRS 102 _lzcnt_u64(unsigned long long __X) { 103 return __builtin_ia32_lzcnt_u64(__X); 104 } 105 #endif 106 107 #undef __DEFAULT_FN_ATTRS 108 109 #endif /* __LZCNTINTRIN_H */ 110