be/src/testutil/mem-util.h

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//   http://www.apache.org/licenses/LICENSE-2.0
//
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#ifndef IMPALA_TESTUTIL_MEM_UTIL_H_
#define IMPALA_TESTUTIL_MEM_UTIL_H_

#include <cstdint>
#include <cstdlib>

#include <glog/logging.h>

#include "gutil/macros.h"

namespace impala {

/// Allocate 64-byte (an x86-64 cache line) aligned memory so it does not straddle cache
/// line boundaries. This is sufficient to meet alignment requirements for all SIMD
/// instructions, at least up to AVX-512.
/// Exits process if allocation fails so should be used for tests and benchmarks only.
inline uint8_t* AllocateAligned(size_t size) {
  void* ptr;
  if (posix_memalign(&ptr, 64, size) != 0) {
    LOG(FATAL) << "Failed to allocate " << size;
  }
  DCHECK(ptr != nullptr);
  return reinterpret_cast<uint8_t*>(ptr);
}

/// Scoped allocation with 64-bit alignment.
/// Exits process if allocation fails so should be used for tests and benchmarks only.
class AlignedAllocation {
 public:
  AlignedAllocation(size_t bytes) : data_(AllocateAligned(bytes)) {}
  ~AlignedAllocation() { free(data_); }

  uint8_t* data() { return data_; }
 private:
  DISALLOW_COPY_AND_ASSIGN(AlignedAllocation);

  uint8_t* data_;
};

}

#endif