popcntintrin.h (1948B) - Raw
1 /*===---- popcntintrin.h - POPCNT intrinsics -------------------------------=== 2 * 3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 * See https://llvm.org/LICENSE.txt for license information. 5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 * 7 *===-----------------------------------------------------------------------=== 8 */ 9 10 #ifndef __POPCNTINTRIN_H 11 #define __POPCNTINTRIN_H 12 13 /* Define the default attributes for the functions in this file. */ 14 #if defined(__cplusplus) && (__cplusplus >= 201103L) 15 #define __DEFAULT_FN_ATTRS \ 16 __attribute__((__always_inline__, __nodebug__, \ 17 __target__("popcnt"))) constexpr 18 #else 19 #define __DEFAULT_FN_ATTRS \ 20 __attribute__((__always_inline__, __nodebug__, __target__("popcnt"))) 21 #endif 22 23 /// Counts the number of bits in the source operand having a value of 1. 24 /// 25 /// \headerfile <x86intrin.h> 26 /// 27 /// This intrinsic corresponds to the <c> POPCNT </c> instruction. 28 /// 29 /// \param __A 30 /// An unsigned 32-bit integer operand. 31 /// \returns A 32-bit integer containing the number of bits with value 1 in the 32 /// source operand. 33 static __inline__ int __DEFAULT_FN_ATTRS 34 _mm_popcnt_u32(unsigned int __A) 35 { 36 return __builtin_popcount(__A); 37 } 38 39 #ifdef __x86_64__ 40 /// Counts the number of bits in the source operand having a value of 1. 41 /// 42 /// \headerfile <x86intrin.h> 43 /// 44 /// This intrinsic corresponds to the <c> POPCNT </c> instruction. 45 /// 46 /// \param __A 47 /// An unsigned 64-bit integer operand. 48 /// \returns A 64-bit integer containing the number of bits with value 1 in the 49 /// source operand. 50 static __inline__ long long __DEFAULT_FN_ATTRS 51 _mm_popcnt_u64(unsigned long long __A) 52 { 53 return __builtin_popcountll(__A); 54 } 55 #endif /* __x86_64__ */ 56 57 #undef __DEFAULT_FN_ATTRS 58 59 #endif /* __POPCNTINTRIN_H */