fuchsia / third_party / swift-clang / refs/tags/swift-4.0-DEVELOPMENT-SNAPSHOT-2017-10-18-a / . / lib / Headers / lzcntintrin.h

/*===---- 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 */ |