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1 /*===---- popcntintrin.h - POPCNT intrinsics -------------------------------===
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2 *
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3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 * See https://llvm.org/LICENSE.txt for license information.
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5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 *
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7 *===-----------------------------------------------------------------------===
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8 */
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9
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10 #ifndef __POPCNTINTRIN_H
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11 #define __POPCNTINTRIN_H
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12
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13 /* Define the default attributes for the functions in this file. */
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14 #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("popcnt")))
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15
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16 #if defined(__cplusplus) && (__cplusplus >= 201103L)
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17 #define __DEFAULT_FN_ATTRS_CONSTEXPR __DEFAULT_FN_ATTRS constexpr
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18 #else
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19 #define __DEFAULT_FN_ATTRS_CONSTEXPR __DEFAULT_FN_ATTRS
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20 #endif
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21
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22 /// Counts the number of bits in the source operand having a value of 1.
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23 ///
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24 /// \headerfile <x86intrin.h>
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25 ///
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26 /// This intrinsic corresponds to the <c> POPCNT </c> instruction.
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27 ///
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28 /// \param __A
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29 /// An unsigned 32-bit integer operand.
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30 /// \returns A 32-bit integer containing the number of bits with value 1 in the
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31 /// source operand.
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32 static __inline__ int __DEFAULT_FN_ATTRS_CONSTEXPR
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33 _mm_popcnt_u32(unsigned int __A)
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34 {
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35 return __builtin_popcount(__A);
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36 }
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37
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38 #ifdef __x86_64__
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39 /// Counts the number of bits in the source operand having a value of 1.
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40 ///
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41 /// \headerfile <x86intrin.h>
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42 ///
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43 /// This intrinsic corresponds to the <c> POPCNT </c> instruction.
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44 ///
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45 /// \param __A
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46 /// An unsigned 64-bit integer operand.
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47 /// \returns A 64-bit integer containing the number of bits with value 1 in the
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48 /// source operand.
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49 static __inline__ long long __DEFAULT_FN_ATTRS_CONSTEXPR
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50 _mm_popcnt_u64(unsigned long long __A)
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51 {
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52 return __builtin_popcountll(__A);
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53 }
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54 #endif /* __x86_64__ */
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55
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56 #undef __DEFAULT_FN_ATTRS
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57 #undef __DEFAULT_FN_ATTRS_CONSTEXPR
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58
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59 #endif /* __POPCNTINTRIN_H */
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