9b412153bf
(1) I added some \see cross-references to a few select intrinsics that are related (and have the same or similar semantics). (2) pmmintrin.h, smmintrin.h, xmmintrin.h have very few minor formatting changes. They make rendering of our intrinsics documentation better. llvm-svn: 333065
123 lines
4.1 KiB
C
123 lines
4.1 KiB
C
/*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------===
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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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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/// 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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static __inline__ unsigned short __DEFAULT_FN_ATTRS
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__lzcnt16(unsigned short __X)
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{
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return __X ? __builtin_clzs(__X) : 16;
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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 _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 __X ? __builtin_clz(__X) : 32;
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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 __X ? __builtin_clz(__X) : 32;
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}
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#ifdef __x86_64__
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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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static __inline__ unsigned long long __DEFAULT_FN_ATTRS
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__lzcnt64(unsigned long long __X)
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{
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return __X ? __builtin_clzll(__X) : 64;
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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 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 __X ? __builtin_clzll(__X) : 64;
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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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