clang/lib/Headers/popcntintrin.h

   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 #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("popcnt")))
  15
  16 #if defined(__cplusplus) && (__cplusplus >= 201103L)
  17 #define __DEFAULT_FN_ATTRS_CONSTEXPR __DEFAULT_FN_ATTRS constexpr
  18 #else
  19 #define __DEFAULT_FN_ATTRS_CONSTEXPR __DEFAULT_FN_ATTRS
  20 #endif
  21
  22 /// Counts the number of bits in the source operand having a value of 1.
  23 ///
  24 /// \headerfile <x86intrin.h>
  25 ///
  26 /// This intrinsic corresponds to the <c> POPCNT </c> instruction.
  27 ///
  28 /// \param __A
  29 ///    An unsigned 32-bit integer operand.
  30 /// \returns A 32-bit integer containing the number of bits with value 1 in the
  31 ///    source operand.
  32 static __inline__ int __DEFAULT_FN_ATTRS_CONSTEXPR
  33 _mm_popcnt_u32(unsigned int __A)
  34 {
  35   return __builtin_popcount(__A);
  36 }
  37
  38 #ifdef __x86_64__
  39 /// Counts the number of bits in the source operand having a value of 1.
  40 ///
  41 /// \headerfile <x86intrin.h>
  42 ///
  43 /// This intrinsic corresponds to the <c> POPCNT </c> instruction.
  44 ///
  45 /// \param __A
  46 ///    An unsigned 64-bit integer operand.
  47 /// \returns A 64-bit integer containing the number of bits with value 1 in the
  48 ///    source operand.
  49 static __inline__ long long __DEFAULT_FN_ATTRS_CONSTEXPR
  50 _mm_popcnt_u64(unsigned long long __A)
  51 {
  52   return __builtin_popcountll(__A);
  53 }
  54 #endif /* __x86_64__ */
  55
  56 #undef __DEFAULT_FN_ATTRS
  57 #undef __DEFAULT_FN_ATTRS_CONSTEXPR
  58
  59 #endif /* __POPCNTINTRIN_H */