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 /// Counts the number of bits in the source operand having a value of 1.
  17 ///
  18 /// \headerfile <x86intrin.h>
  19 ///
  20 /// This intrinsic corresponds to the <c> POPCNT </c> instruction.
  21 ///
  22 /// \param __A
  23 ///    An unsigned 32-bit integer operand.
  24 /// \returns A 32-bit integer containing the number of bits with value 1 in the
  25 ///    source operand.
  26 static __inline__ int __DEFAULT_FN_ATTRS
  27 _mm_popcnt_u32(unsigned int __A)
  28 {
  29   return __builtin_popcount(__A);
  30 }
  31
  32 #ifdef __x86_64__
  33 /// Counts the number of bits in the source operand having a value of 1.
  34 ///
  35 /// \headerfile <x86intrin.h>
  36 ///
  37 /// This intrinsic corresponds to the <c> POPCNT </c> instruction.
  38 ///
  39 /// \param __A
  40 ///    An unsigned 64-bit integer operand.
  41 /// \returns A 64-bit integer containing the number of bits with value 1 in the
  42 ///    source operand.
  43 static __inline__ long long __DEFAULT_FN_ATTRS
  44 _mm_popcnt_u64(unsigned long long __A)
  45 {
  46   return __builtin_popcountll(__A);
  47 }
  48 #endif /* __x86_64__ */
  49
  50 #undef __DEFAULT_FN_ATTRS
  51
  52 #endif /* __POPCNTINTRIN_H */