105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
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/*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------===
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*
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* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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* See https://llvm.org/LICENSE.txt for license information.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*
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*===-----------------------------------------------------------------------===
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*/
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#if !defined __X86INTRIN_H && !defined __IMMINTRIN_H
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#error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead."
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#endif
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#ifndef __LZCNTINTRIN_H
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#define __LZCNTINTRIN_H
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/* Define the default attributes for the functions in this file. */
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#define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("lzcnt")))
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#ifndef _MSC_VER
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/// Counts the number of leading zero bits in the operand.
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///
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/// \headerfile <x86intrin.h>
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///
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/// This intrinsic corresponds to the \c LZCNT instruction.
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///
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/// \param __X
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/// An unsigned 16-bit integer whose leading zeros are to be counted.
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/// \returns An unsigned 16-bit integer containing the number of leading zero
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/// bits in the operand.
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#define __lzcnt16(X) __builtin_ia32_lzcnt_u16((unsigned short)(X))
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#endif // _MSC_VER
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/// Counts the number of leading zero bits in the operand.
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///
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/// \headerfile <x86intrin.h>
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///
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/// This intrinsic corresponds to the \c LZCNT instruction.
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///
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/// \param __X
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/// An unsigned 32-bit integer whose leading zeros are to be counted.
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/// \returns An unsigned 32-bit integer containing the number of leading zero
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/// bits in the operand.
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/// \see _lzcnt_u32
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static __inline__ unsigned int __DEFAULT_FN_ATTRS
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__lzcnt32(unsigned int __X)
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{
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return __builtin_ia32_lzcnt_u32(__X);
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}
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/// Counts the number of leading zero bits in the operand.
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///
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/// \headerfile <x86intrin.h>
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///
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/// This intrinsic corresponds to the \c LZCNT instruction.
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///
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/// \param __X
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/// An unsigned 32-bit integer whose leading zeros are to be counted.
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/// \returns An unsigned 32-bit integer containing the number of leading zero
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/// bits in the operand.
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/// \see __lzcnt32
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static __inline__ unsigned int __DEFAULT_FN_ATTRS
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_lzcnt_u32(unsigned int __X)
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{
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return __builtin_ia32_lzcnt_u32(__X);
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}
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#ifdef __x86_64__
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#ifndef _MSC_VER
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/// Counts the number of leading zero bits in the operand.
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///
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/// \headerfile <x86intrin.h>
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///
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/// This intrinsic corresponds to the \c LZCNT instruction.
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///
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/// \param __X
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/// An unsigned 64-bit integer whose leading zeros are to be counted.
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/// \returns An unsigned 64-bit integer containing the number of leading zero
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/// bits in the operand.
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/// \see _lzcnt_u64
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#define __lzcnt64(X) __builtin_ia32_lzcnt_u64((unsigned long long)(X))
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#endif // _MSC_VER
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/// Counts the number of leading zero bits in the operand.
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///
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/// \headerfile <x86intrin.h>
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///
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/// This intrinsic corresponds to the \c LZCNT instruction.
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///
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/// \param __X
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/// An unsigned 64-bit integer whose leading zeros are to be counted.
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/// \returns An unsigned 64-bit integer containing the number of leading zero
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/// bits in the operand.
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/// \see __lzcnt64
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static __inline__ unsigned long long __DEFAULT_FN_ATTRS
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_lzcnt_u64(unsigned long long __X)
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{
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return __builtin_ia32_lzcnt_u64(__X);
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}
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#endif
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#undef __DEFAULT_FN_ATTRS
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#endif /* __LZCNTINTRIN_H */
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