From c062000288b1ab074af65c66cbff05c498205a94 Mon Sep 17 00:00:00 2001
From: Nekotekina <nekotekina@gmail.com>
Date: Mon, 15 Jul 2019 17:20:12 +0300
Subject: [PATCH] Add experimental TSC frequency detection

---
 Utilities/sysinfo.cpp | 24 +++++++++++++++++++++++-
 Utilities/sysinfo.h   |  2 ++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/Utilities/sysinfo.cpp b/Utilities/sysinfo.cpp
index 31a6a72424..2f45f56575 100755
--- a/Utilities/sysinfo.cpp
+++ b/Utilities/sysinfo.cpp
@@ -110,6 +110,15 @@ 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())
+	{
+		fmt::append(result, " | TSC: %.02fGHz", tsc_freq / 1000000000.);
+	}
+	else
+	{
+		fmt::append(result, " | TSC: Bad");
+	}
+
 	if (has_avx())
 	{
 		result += " | AVX";
@@ -138,7 +147,7 @@ std::string utils::get_system_info()
 		{
 			result += "-FA";
 		}
-		
+
 		if (!has_mpx())
 		{
 			result += " disabled by default";
@@ -214,3 +223,16 @@ std::string utils::get_OS_version()
 #endif
 	return output;
 }
+
+ullong utils::get_tsc_freq()
+{
+#ifdef _WIN32
+	LARGE_INTEGER freq;
+	if (!QueryPerformanceFrequency(&freq) || freq.QuadPart > 9'999'999)
+		return 0;
+	return freq.QuadPart * 1024;
+#else
+	// TODO
+	return 0;
+#endif
+}
diff --git a/Utilities/sysinfo.h b/Utilities/sysinfo.h
index 71d1d2e81b..7479529544 100755
--- a/Utilities/sysinfo.h
+++ b/Utilities/sysinfo.h
@@ -50,4 +50,6 @@ namespace utils
 	std::string get_firmware_version();
 
 	std::string get_OS_version();
+
+	ullong get_tsc_freq();
 }