| /*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------=== |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| * |
| *===-----------------------------------------------------------------------=== |
| */ |
| |
| #if !defined __X86INTRIN_H && !defined __IMMINTRIN_H |
| #error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead." |
| #endif |
| |
| #ifndef __LZCNTINTRIN_H |
| #define __LZCNTINTRIN_H |
| |
| /* Define the default attributes for the functions in this file. */ |
| #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("lzcnt"))) |
| |
| /// \brief Counts the number of leading zero bits in the operand. |
| /// |
| /// \headerfile <x86intrin.h> |
| /// |
| /// This intrinsic corresponds to the \c LZCNT instruction. |
| /// |
| /// \param __X |
| /// An unsigned 16-bit integer whose leading zeros are to be counted. |
| /// \returns An unsigned 16-bit integer containing the number of leading zero |
| /// bits in the operand. |
| static __inline__ unsigned short __DEFAULT_FN_ATTRS |
| __lzcnt16(unsigned short __X) |
| { |
| return __X ? __builtin_clzs(__X) : 16; |
| } |
| |
| /// \brief Counts the number of leading zero bits in the operand. |
| /// |
| /// \headerfile <x86intrin.h> |
| /// |
| /// This intrinsic corresponds to the \c LZCNT instruction. |
| /// |
| /// \param __X |
| /// An unsigned 32-bit integer whose leading zeros are to be counted. |
| /// \returns An unsigned 32-bit integer containing the number of leading zero |
| /// bits in the operand. |
| static __inline__ unsigned int __DEFAULT_FN_ATTRS |
| __lzcnt32(unsigned int __X) |
| { |
| return __X ? __builtin_clz(__X) : 32; |
| } |
| |
| /// \brief Counts the number of leading zero bits in the operand. |
| /// |
| /// \headerfile <x86intrin.h> |
| /// |
| /// This intrinsic corresponds to the \c LZCNT instruction. |
| /// |
| /// \param __X |
| /// An unsigned 32-bit integer whose leading zeros are to be counted. |
| /// \returns An unsigned 32-bit integer containing the number of leading zero |
| /// bits in the operand. |
| static __inline__ unsigned int __DEFAULT_FN_ATTRS |
| _lzcnt_u32(unsigned int __X) |
| { |
| return __X ? __builtin_clz(__X) : 32; |
| } |
| |
| #ifdef __x86_64__ |
| /// \brief Counts the number of leading zero bits in the operand. |
| /// |
| /// \headerfile <x86intrin.h> |
| /// |
| /// This intrinsic corresponds to the \c LZCNT instruction. |
| /// |
| /// \param __X |
| /// An unsigned 64-bit integer whose leading zeros are to be counted. |
| /// \returns An unsigned 64-bit integer containing the number of leading zero |
| /// bits in the operand. |
| static __inline__ unsigned long long __DEFAULT_FN_ATTRS |
| __lzcnt64(unsigned long long __X) |
| { |
| return __X ? __builtin_clzll(__X) : 64; |
| } |
| |
| /// \brief Counts the number of leading zero bits in the operand. |
| /// |
| /// \headerfile <x86intrin.h> |
| /// |
| /// This intrinsic corresponds to the \c LZCNT instruction. |
| /// |
| /// \param __X |
| /// An unsigned 64-bit integer whose leading zeros are to be counted. |
| /// \returns An unsigned 64-bit integer containing the number of leading zero |
| /// bits in the operand. |
| static __inline__ unsigned long long __DEFAULT_FN_ATTRS |
| _lzcnt_u64(unsigned long long __X) |
| { |
| return __X ? __builtin_clzll(__X) : 64; |
| } |
| #endif |
| |
| #undef __DEFAULT_FN_ATTRS |
| |
| #endif /* __LZCNTINTRIN_H */ |