clang/lib/Headers/prfchwintrin.h

   1 /*===---- prfchwintrin.h - PREFETCHW intrinsic -----------------------------===
   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 #if !defined(__X86INTRIN_H) && !defined(_MM3DNOW_H_INCLUDED)
  11 #error "Never use <prfchwintrin.h> directly; include <x86intrin.h> or <mm3dnow.h> instead."
  12 #endif
  13
  14 #ifndef __PRFCHWINTRIN_H
  15 #define __PRFCHWINTRIN_H
  16
  17 /// Loads a memory sequence containing the specified memory address into
  18 ///    all data cache levels. The cache-coherency state is set to exclusive.
  19 ///    Data can be read from and written to the cache line without additional
  20 ///    delay.
  21 ///
  22 /// \headerfile <x86intrin.h>
  23 ///
  24 /// This intrinsic corresponds to the \c PREFETCHT0 instruction.
  25 ///
  26 /// \param __P
  27 ///    A pointer specifying the memory address to be prefetched.
  28 static __inline__ void __attribute__((__always_inline__, __nodebug__))
  29 _m_prefetch(void *__P)
  30 {
  31   __builtin_prefetch (__P, 0, 3 /* _MM_HINT_T0 */);
  32 }
  33
  34 /// Loads a memory sequence containing the specified memory address into
  35 ///    the L1 data cache and sets the cache-coherency to modified. This
  36 ///    provides a hint to the processor that the cache line will be modified.
  37 ///    It is intended for use when the cache line will be written to shortly
  38 ///    after the prefetch is performed.
  39 ///
  40 ///    Note that the effect of this intrinsic is dependent on the processor
  41 ///    implementation.
  42 ///
  43 /// \headerfile <x86intrin.h>
  44 ///
  45 /// This intrinsic corresponds to the \c PREFETCHW instruction.
  46 ///
  47 /// \param __P
  48 ///    A pointer specifying the memory address to be prefetched.
  49 static __inline__ void __attribute__((__always_inline__, __nodebug__))
  50 _m_prefetchw(volatile const void *__P)
  51 {
  52 #pragma clang diagnostic push
  53 #pragma clang diagnostic ignored "-Wcast-qual"
  54   __builtin_prefetch ((const void*)__P, 1, 3 /* _MM_HINT_T0 */);
  55 #pragma clang diagnostic pop
  56 }
  57
  58 #endif /* __PRFCHWINTRIN_H */