bench/check_cache_queries.cpp

#define EIGEN_INTERNAL_DEBUG_CACHE_QUERY
#include <iostream>
#include "../Eigen/Core"

using namespace Eigen;
using namespace std;

#define DUMP_CPUID(CODE)                                                                              \
  {                                                                                                   \
    int abcd[4];                                                                                      \
    abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;                                                        \
    EIGEN_CPUID(abcd, CODE, 0);                                                                       \
    std::cout << "The code " << CODE << " gives " << (int*)(abcd[0]) << " " << (int*)(abcd[1]) << " " \
              << (int*)(abcd[2]) << " " << (int*)(abcd[3]) << " " << std::endl;                       \
  }

int main() {
  cout << "Eigen's L1    = " << internal::queryL1CacheSize() << endl;
  cout << "Eigen's L2/L3 = " << internal::queryTopLevelCacheSize() << endl;
  int l1, l2, l3;
  internal::queryCacheSizes(l1, l2, l3);
  cout << "Eigen's L1, L2, L3       = " << l1 << " " << l2 << " " << l3 << endl;

#ifdef EIGEN_CPUID

  int abcd[4];
  int string[8];
  char* string_char = (char*)(string);

  // vendor ID
  EIGEN_CPUID(abcd, 0x0, 0);
  string[0] = abcd[1];
  string[1] = abcd[3];
  string[2] = abcd[2];
  string[3] = 0;
  cout << endl;
  cout << "vendor id = " << string_char << endl;
  cout << endl;
  int max_funcs = abcd[0];

  internal::queryCacheSizes_intel_codes(l1, l2, l3);
  cout << "Eigen's intel codes L1, L2, L3 = " << l1 << " " << l2 << " " << l3 << endl;
  if (max_funcs >= 4) {
    internal::queryCacheSizes_intel_direct(l1, l2, l3);
    cout << "Eigen's intel direct L1, L2, L3 = " << l1 << " " << l2 << " " << l3 << endl;
  }
  internal::queryCacheSizes_amd(l1, l2, l3);
  cout << "Eigen's amd L1, L2, L3         = " << l1 << " " << l2 << " " << l3 << endl;
  cout << endl;

  // dump Intel direct method
  if (max_funcs >= 4) {
    l1 = l2 = l3 = 0;
    int cache_id = 0;
    int cache_type = 0;
    do {
      abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;
      EIGEN_CPUID(abcd, 0x4, cache_id);
      cache_type = (abcd[0] & 0x0F) >> 0;
      int cache_level = (abcd[0] & 0xE0) >> 5;        // A[7:5]
      int ways = (abcd[1] & 0xFFC00000) >> 22;        // B[31:22]
      int partitions = (abcd[1] & 0x003FF000) >> 12;  // B[21:12]
      int line_size = (abcd[1] & 0x00000FFF) >> 0;    // B[11:0]
      int sets = (abcd[2]);                           // C[31:0]
      int cache_size = (ways + 1) * (partitions + 1) * (line_size + 1) * (sets + 1);

      cout << "cache[" << cache_id << "].type       = " << cache_type << "\n";
      cout << "cache[" << cache_id << "].level      = " << cache_level << "\n";
      cout << "cache[" << cache_id << "].ways       = " << ways << "\n";
      cout << "cache[" << cache_id << "].partitions = " << partitions << "\n";
      cout << "cache[" << cache_id << "].line_size  = " << line_size << "\n";
      cout << "cache[" << cache_id << "].sets       = " << sets << "\n";
      cout << "cache[" << cache_id << "].size       = " << cache_size << "\n";

      cache_id++;
    } while (cache_type > 0 && cache_id < 16);
  }

  // dump everything
  std::cout << endl << "Raw dump:" << endl;
  for (int i = 0; i < max_funcs; ++i) DUMP_CPUID(i);

  DUMP_CPUID(0x80000000);
  DUMP_CPUID(0x80000001);
  DUMP_CPUID(0x80000002);
  DUMP_CPUID(0x80000003);
  DUMP_CPUID(0x80000004);
  DUMP_CPUID(0x80000005);
  DUMP_CPUID(0x80000006);
  DUMP_CPUID(0x80000007);
  DUMP_CPUID(0x80000008);
#else
  cout << "EIGEN_CPUID is not defined" << endl;
#endif
  return 0;
}