/* Copyright (C) 2009-2012 Matthias Kretz This program is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) version 3. This library 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef TSC_H #define TSC_H #ifdef _MSC_VER #include #pragma intrinsic(__rdtsc) #endif class TimeStampCounter { public: void Start(); void Stop(); unsigned long long Cycles() const; private: union Data { unsigned long long a; unsigned int b[2]; } m_start, m_end; }; inline void TimeStampCounter::Start() { #ifdef _MSC_VER unsigned int tmp; m_start.a = __rdtscp(&tmp); #else asm volatile("rdtscp" : "=a"(m_start.b[0]), "=d"(m_start.b[1]) :: "ecx" ); #endif } inline void TimeStampCounter::Stop() { #ifdef _MSC_VER unsigned int tmp; m_end.a = __rdtscp(&tmp); #else asm volatile("rdtscp" : "=a"(m_end.b[0]), "=d"(m_end.b[1]) :: "ecx" ); #endif } inline unsigned long long TimeStampCounter::Cycles() const { return m_end.a - m_start.a; } #endif // TSC_H