| 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 |