llvm/openmp/runtime/src/kmp_barrier.h

/*
 * kmp_barrier.h
 */

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef KMP_BARRIER_H
#define KMP_BARRIER_H

#include "kmp.h"
#include "kmp_i18n.h"

#if KMP_HAVE_XMMINTRIN_H && KMP_HAVE__MM_MALLOC
#include <xmmintrin.h>
#define KMP_ALIGNED_ALLOCATE(size, alignment) …
#define KMP_ALIGNED_FREE(ptr) …
#elif KMP_HAVE_ALIGNED_ALLOC
#define KMP_ALGIN_UP …
#define KMP_ALIGNED_ALLOCATE …
#define KMP_ALIGNED_FREE …
#elif KMP_HAVE_POSIX_MEMALIGN
static inline void *KMP_ALIGNED_ALLOCATE(size_t size, size_t alignment) {
  void *ptr;
  int n = posix_memalign(&ptr, alignment, size);
  if (n != 0) {
    if (ptr)
      free(ptr);
    return nullptr;
  }
  return ptr;
}
#define KMP_ALIGNED_FREE …
#elif KMP_HAVE__ALIGNED_MALLOC
#include <malloc.h>
#define KMP_ALIGNED_ALLOCATE …
#define KMP_ALIGNED_FREE …
#else
#define KMP_ALIGNED_ALLOCATE …
#define KMP_ALIGNED_FREE …
#endif

// Use four cache lines: MLC tends to prefetch the next or previous cache line
// creating a possible fake conflict between cores, so this is the only way to
// guarantee that no such prefetch can happen.
#ifndef KMP_FOURLINE_ALIGN_CACHE
#define KMP_FOURLINE_ALIGN_CACHE …
#endif

#define KMP_OPTIMIZE_FOR_REDUCTIONS …

class distributedBarrier { … };

#endif // KMP_BARRIER_H