(svn r18420) -Codechange: split YAPF's track follower from the actual YAPF code

src/pathfinder/pf_performance_timer.hpp

@@ -0,0 +1,82 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file pf_performance_timer.hpp Performance timer for pathfinders. */
+
+#ifndef  PF_PERFORMANCE_TIMER_HPP
+#define  PF_PERFORMANCE_TIMER_HPP
+
+extern uint64 ottd_rdtsc();
+
+struct CPerformanceTimer
+{
+	int64    m_start;
+	int64    m_acc;
+
+	CPerformanceTimer() : m_start(0), m_acc(0) {}
+
+	FORCEINLINE void Start()
+	{
+		m_start = QueryTime();
+	}
+
+	FORCEINLINE void Stop()
+	{
+		m_acc += QueryTime() - m_start;
+	}
+
+	FORCEINLINE int Get(int64 coef)
+	{
+		return (int)(m_acc * coef / QueryFrequency());
+	}
+
+	FORCEINLINE int64 QueryTime()
+	{
+		return ottd_rdtsc();
+	}
+
+	FORCEINLINE int64 QueryFrequency()
+	{
+		return ((int64)2200 * 1000000);
+	}
+};
+
+struct CPerfStartReal
+{
+	CPerformanceTimer *m_pperf;
+
+	FORCEINLINE CPerfStartReal(CPerformanceTimer& perf) : m_pperf(&perf)
+	{
+		if (m_pperf != NULL) m_pperf->Start();
+	}
+
+	FORCEINLINE ~CPerfStartReal()
+	{
+		Stop();
+	}
+
+	FORCEINLINE void Stop()
+	{
+		if (m_pperf != NULL) {
+			m_pperf->Stop();
+			m_pperf = NULL;
+		}
+	}
+};
+
+struct CPerfStartFake
+{
+	FORCEINLINE CPerfStartFake(CPerformanceTimer& perf) {}
+	FORCEINLINE ~CPerfStartFake() {}
+	FORCEINLINE void Stop() {}
+};
+
+typedef CPerfStartFake CPerfStart;
+
+#endif /* PF_PERFORMANCE_TIMER_HPP */