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add a utilility to debug cpuid, and makes sure we get 0 if we query an unsupported cpuid function
This commit is contained in:
Gael Guennebaud
parent
d8b1ce664b
commit
931027f31b
@ -614,6 +614,7 @@ inline void ei_queryCacheSizes_intel(int& l1, int& l2, int& l3)
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int cache_id = 0;
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int cache_type = 0;
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do {
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abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;
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EIGEN_CPUID(abcd,0x4,cache_id);
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cache_type = (abcd[0] & 0x0F) >> 0;
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if(cache_type==1||cache_type==3) // data or unified cache
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@ -641,8 +642,10 @@ inline void ei_queryCacheSizes_intel(int& l1, int& l2, int& l3)
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inline void ei_queryCacheSizes_amd(int& l1, int& l2, int& l3)
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{
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int abcd[4];
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abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;
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EIGEN_CPUID(abcd,0x80000005,0);
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l1 = (abcd[2] >> 24) * 1024; // C[31:24] = L1 size in KB
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abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;
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EIGEN_CPUID(abcd,0x80000006,0);
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l2 = (abcd[2] >> 16) * 1024; // C[31;16] = l2 cache size in KB
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l3 = ((abcd[3] & 0xFFFC000) >> 18) * 512 * 1024; // D[31;18] = l3 cache size in 512KB
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129
bench/check_cache_queries.cpp
Normal file
129
bench/check_cache_queries.cpp
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@ -0,0 +1,129 @@
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#define EIGEN_INTERNAL_DEBUG_CACHE_QUERY
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#include <iostream>
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#include "../Eigen/Core"
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using namespace Eigen;
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using namespace std;
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#define DUMP_CPUID(CODE) {\
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int abcd[4]; \
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abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;\
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EIGEN_CPUID(abcd, CODE, 0); \
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std::cout << "The code " << CODE << " gives " \
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<< (int*)(abcd[0]) << " " << (int*)(abcd[1]) << " " \
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<< (int*)(abcd[2]) << " " << (int*)(abcd[3]) << " " << std::endl; \
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}
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int main()
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{
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cout << "Eigen's L1 = " << ei_queryL1CacheSize() << endl;
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cout << "Eigen's L2/L3 = " << ei_queryTopLevelCacheSize() << endl;
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int l1, l2, l3;
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ei_queryCacheSizes(l1, l2, l3);
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cout << "Eigen's L1, L2, L3 = " << l1 << " " << l2 << " " << l3 << endl;
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#ifdef EIGEN_CPUID
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ei_queryCacheSizes_intel(l1, l2, l3);
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cout << "Eigen's intel L1, L2, L3 = " << l1 << " " << l2 << " " << l3 << endl;
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ei_queryCacheSizes_amd(l1, l2, l3);
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cout << "Eigen's amd L1, L2, L3 = " << l1 << " " << l2 << " " << l3 << endl;
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int abcd[4];
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int string[8];
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char* string_char = (char*)(string);
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// vendor ID
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EIGEN_CPUID(abcd,0x0,0);
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string[0] = abcd[1];
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string[1] = abcd[3];
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string[2] = abcd[2];
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string[3] = 0;
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cout << "vendor id = " << string_char << endl;
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// dump Intel direct method
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{
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l1 = l2 = l3 = 0;
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int cache_id = 0;
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int cache_type = 0;
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do {
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abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;
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EIGEN_CPUID(abcd,0x4,cache_id);
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cache_type = (abcd[0] & 0x0F) >> 0;
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int cache_level = (abcd[0] & 0xE0) >> 5; // A[7:5]
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int ways = (abcd[1] & 0xFFC00000) >> 22; // B[31:22]
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int partitions = (abcd[1] & 0x003FF000) >> 12; // B[21:12]
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int line_size = (abcd[1] & 0x00000FFF) >> 0; // B[11:0]
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int sets = (abcd[2]); // C[31:0]
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int cache_size = (ways+1) * (partitions+1) * (line_size+1) * (sets+1);
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cout << "cache[" << cache_id << "].type = " << cache_type << "\n";
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cout << "cache[" << cache_id << "].level = " << cache_level << "\n";
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cout << "cache[" << cache_id << "].ways = " << ways << "\n";
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cout << "cache[" << cache_id << "].partitions = " << partitions << "\n";
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cout << "cache[" << cache_id << "].line_size = " << line_size << "\n";
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cout << "cache[" << cache_id << "].sets = " << sets << "\n";
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cout << "cache[" << cache_id << "].size = " << cache_size << "\n";
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cache_id++;
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} while(cache_type>0);
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}
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// dump everything
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std::cout << endl <<"Raw dump:" << endl;
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DUMP_CPUID(0x0);
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DUMP_CPUID(0x1);
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DUMP_CPUID(0x2);
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DUMP_CPUID(0x3);
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DUMP_CPUID(0x4);
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DUMP_CPUID(0x5);
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DUMP_CPUID(0x6);
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DUMP_CPUID(0x80000000);
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DUMP_CPUID(0x80000001);
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DUMP_CPUID(0x80000002);
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DUMP_CPUID(0x80000003);
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DUMP_CPUID(0x80000004);
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DUMP_CPUID(0x80000005);
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DUMP_CPUID(0x80000006);
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DUMP_CPUID(0x80000007);
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DUMP_CPUID(0x80000008);
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#else
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cout << "EIGEN_CPUID is not defined" << endl;
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#endif
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return 0;
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}
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#if 0
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#define FOO(CODE) { \
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EIGEN_CPUID(abcd, CODE); \
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std::cout << "The code " << CODE << " gives " \
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<< (int*)(abcd[0]) << " " << (int*)(abcd[1]) << " " \
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<< (int*)(abcd[2]) << " " << (int*)(abcd[3]) << " " << std::endl; \
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}
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int abcd[5];
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abcd[4] = 0;
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// for (int a = 0; a < 5; a++) {
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// cpuid(abcd,a);
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// std::cout << "The code " << a << " gives "
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// << abcd[0] << " " << abcd[1] << " "
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// << abcd[2] << " " << abcd[3] << " " << abcd[4] << std::endl;
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// }
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FOO(0x1); std::cerr << (char*)abcd << "\n";
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FOO(0x2);
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FOO(0x2);
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FOO(0x2);
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FOO(0x3); std::cerr << (char*)abcd << "\n";
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FOO(0x80000002); std::cerr << (char*)abcd << "\n";
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FOO(0x80000003); std::cerr << (char*)abcd << "\n";
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FOO(0x80000004); std::cerr << (char*)abcd << "\n";
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FOO(0x80000005); std::cerr << (char*)abcd << "\n";
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FOO(0x80000006); std::cerr << (char*)(abcd) << "\n";
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std::cerr << "L2 : " << (abcd[2] >> 16) << "KB\n";
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// FOO(0x80000019); std::cerr << (char*)(abcd) << "\n";
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FOO(0x8000001A); std::cerr << (char*)(abcd) << "\n";
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#endif
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