clang/lib/Headers/clzerointrin.h

   1 /*===----------------------- clzerointrin.h - CLZERO ----------------------===
   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 #ifndef __X86INTRIN_H
  10 #error "Never use <clzerointrin.h> directly; include <x86intrin.h> instead."
  11 #endif
  12
  13 #ifndef __CLZEROINTRIN_H
  14 #define __CLZEROINTRIN_H
  15
  16 /* Define the default attributes for the functions in this file. */
  17 #define __DEFAULT_FN_ATTRS \
  18   __attribute__((__always_inline__, __nodebug__,  __target__("clzero")))
  19
  20 /// Zeroes out the cache line for the address \a __line. This uses a
  21 ///    non-temporal store. Calling \c _mm_sfence() afterward might be needed
  22 ///    to enforce ordering.
  23 ///
  24 /// \headerfile <x86intrin.h>
  25 ///
  26 /// This intrinsic corresponds to the \c CLZERO instruction.
  27 ///
  28 /// \param __line
  29 ///    An address within the cache line to zero out.
  30 static __inline__ void __DEFAULT_FN_ATTRS
  31 _mm_clzero (void * __line)
  32 {
  33   __builtin_ia32_clzero ((void *)__line);
  34 }
  35
  36 #undef __DEFAULT_FN_ATTRS
  37
  38 #endif /* __CLZEROINTRIN_H */