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add a utilility to debug cpuid, and makes sure we get 0 if we query an unsupported cpuid function

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This commit is contained in:
Gael Guennebaud
2010-06-26 23:15:06 +02:00
parent d8b1ce664b
commit 931027f31b
2 changed files with 132 additions and 0 deletions
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3
Eigen/src/Core/util/Memory.h
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@@ -614,6 +614,7 @@ inline void ei_queryCacheSizes_intel(int& l1, int& l2, int& l3)
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;
if(cache_type==1||cache_type==3) // data or unified cache
@@ -641,8 +642,10 @@ inline void ei_queryCacheSizes_intel(int& l1, int& l2, int& l3)
inline void ei_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