Imported Upstream version 1.1.0upstream/1.1.0

1 files changed, 60 insertions, 0 deletions

diff --git a/src/ToolBox/superpmi/superpmi/cycletimer.cpp b/src/ToolBox/superpmi/superpmi/cycletimer.cpp
new file mode 100644
index 0000000000..de0e19b935
--- /dev/null
+++ b/src/ToolBox/superpmi/superpmi/cycletimer.cpp
@@ -0,0 +1,60 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+#include "standardpch.h"
+#include "cycletimer.h"
+
+CycleTimer::CycleTimer()
+{
+    start = 0;
+    stop = 0;
+    overhead = QueryOverhead();
+}
+
+CycleTimer::~CycleTimer()
+{
+}
+
+void CycleTimer::Start()
+{
+    BOOL retVal = QueryThreadCycleTime(GetCurrentThread(), &start);
+
+    if(retVal == FALSE)
+    {
+        LogError("CycleTimer::Start unable to QPC. error was 0x%08x", ::GetLastError());
+        ::__debugbreak();
+    }
+}
+
+void CycleTimer::Stop()
+{
+    BOOL retVal = QueryThreadCycleTime(GetCurrentThread(), &stop);
+
+    if(retVal == FALSE)
+    {
+        LogError("CycleTimer::Stop unable to QPC. error was 0x%08x", ::GetLastError());
+        ::__debugbreak();
+    }
+}
+
+unsigned __int64 CycleTimer::GetCycles()
+{
+    return stop - start - overhead;
+}
+
+unsigned __int64 CycleTimer::QueryOverhead()
+{
+    unsigned __int64 tot = 0;
+    unsigned __int64 startCycles;
+    unsigned __int64 endCycles;
+    const int N = 1000;
+    for (int i = 0; i < N; i++)
+    {
+        QueryThreadCycleTime(GetCurrentThread(), &startCycles);
+        QueryThreadCycleTime(GetCurrentThread(), &endCycles);
+        tot += (endCycles-startCycles);
+    }
+    return tot/N;
+}
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