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Util: Add FMA and INVARIANT_TSC detection (#7937)

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Whatcookie 2020-04-04 14:12:06 -04:00 committed by GitHub
parent 63080c22a3
commit dd8a3eaac5
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2 changed files with 47 additions and 2 deletions
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43
Utilities/sysinfo.cpp
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@ -75,6 +75,24 @@ bool utils::has_clwb()
return g_value;
}
bool utils::has_invariant_tsc()
{
static const bool g_value = get_cpuid(0, 0)[0] >= 0x7 && (get_cpuid(0x80000007, 0)[3] & 0x100) == 0x100;
return g_value;
}
bool utils::has_fma3()
{
static const bool g_value = get_cpuid(0, 0)[0] >= 0x1 && get_cpuid(1, 0)[2] & 0x1000;
return g_value;
}
bool utils::has_fma4()
{
static const bool g_value = get_cpuid(0, 0)[0] >= 0x7 && (get_cpuid(0x80000001, 0)[2] & 0x10000) == 0x10000;
return g_value;
}
std::string utils::get_cpu_brand()
{
std::string brand;
@ -113,7 +131,11 @@ std::string utils::get_system_info()
fmt::append(result, "%s | %d Threads | %.2f GiB RAM", brand, num_proc, mem_total / (1024.0f * 1024 * 1024));
if (const ullong tsc_freq = get_tsc_freq())
if (!has_invariant_tsc())
{
fmt::append(result, " | TSC: Bad");
}
else if (const ullong tsc_freq = get_tsc_freq())
{
fmt::append(result, " | TSC: %.02fGHz", tsc_freq / 1000000000.);
}
@ -142,6 +164,24 @@ std::string utils::get_system_info()
}
}
if (has_fma3() || has_fma4())
{
result += " | FMA";
if (has_fma3() && has_fma4())
{
result += "3+4";
}
else if (has_fma3())
{
result += "3";
}
else if (has_fma4())
{
result += "4";
}
}
if (has_rtm())
{
result += " | TSX";
@ -155,7 +195,6 @@ std::string utils::get_system_info()
{
result += " disabled by default";
}
}
return result;

6
Utilities/sysinfo.h
View File

@ -47,6 +47,12 @@ namespace utils
bool has_clwb();
bool has_invariant_tsc();
bool has_fma3();
bool has_fma4();
std::string get_cpu_brand();
std::string get_system_info();