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Proper CPUID

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This commit is contained in:
Ivan Popivanov 2021-01-05 12:51:10 -08:00
parent cdd8fdc32e
commit e409795d6b
1 changed files with 20 additions and 8 deletions
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28
Eigen/src/Core/util/Memory.h
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@ -1048,20 +1048,32 @@ inline void queryCacheSizes_intel(int& l1, int& l2, int& l3, int max_std_funcs)
{
if(max_std_funcs>=4)
queryCacheSizes_intel_direct(l1,l2,l3);
else
else if(max_std_funcs>=2)
queryCacheSizes_intel_codes(l1,l2,l3);
else
l1 = l2 = l3 = 0;
}
inline void queryCacheSizes_amd(int& l1, int& l2, int& l3)
{
int abcd[4];
abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;
EIGEN_CPUID(abcd,0x80000005,0);
l1 = (abcd[2] >> 24) * 1024; // C[31:24] = L1 size in KB
abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;
EIGEN_CPUID(abcd,0x80000006,0);
l2 = (abcd[2] >> 16) * 1024; // C[31;16] = l2 cache size in KB
l3 = ((abcd[3] & 0xFFFC000) >> 18) * 512 * 1024; // D[31;18] = l3 cache size in 512KB
// First query the max supported function.
EIGEN_CPUID(abcd,0x80000000,0);
if(abcd[0] >= 0x80000006)
{
EIGEN_CPUID(abcd,0x80000005,0);
l1 = (abcd[2] >> 24) * 1024; // C[31:24] = L1 size in KB
abcd[0] = abcd[1] = abcd[2] = abcd[3] = 0;
EIGEN_CPUID(abcd,0x80000006,0);
l2 = (abcd[2] >> 16) * 1024; // C[31;16] = l2 cache size in KB
l3 = ((abcd[3] & 0xFFFC000) >> 18) * 512 * 1024; // D[31;18] = l3 cache size in 512KB
}
else
{
l1 = l2 = l3 = 0;
}
}
#endif
@ -1077,7 +1089,7 @@ inline void queryCacheSizes(int& l1, int& l2, int& l3)
// identify the CPU vendor
EIGEN_CPUID(abcd,0x0,0);
int max_std_funcs = abcd[1];
int max_std_funcs = abcd[0];
if(cpuid_is_vendor(abcd,GenuineIntel))
queryCacheSizes_intel(l1,l2,l3,max_std_funcs);
else if(cpuid_is_vendor(abcd,AuthenticAMD) || cpuid_is_vendor(abcd,AMDisbetter_))