FastWallTimer.h

# ifndef Conjecture_CpuTimer_h
# define Conjecture_CpuTimer_h Conjecture_CpuTimer_h

// Insert SVN header substitution variable here
// Class Champion: Unassigned

# include "Root.h"  // parent

namespace Conjecture {

#ifdef HAVE_RDTSC

    class FastWallTimer {
      public:
    // Types

        // Constructors/Destructors
        FastWallTimer();

        // Accessors
        inline const bool running() const { return this->_running; }

        inline const uint64_t cycles() const {
            if (this->_running)
                return 0;
            else
                return this->_end - this_start;
        }

        inline void start() {
            this->_running = true;
            this->_start = rdtsc();
        }

        inline void stop() {
            this->_start = rdtsc();
            this->_running = false;
        }

    private:
        inline uint64_t int rdtsc( void ) {
            uint64_t x;
            __asm__ volatile (".byte 0x0f, 0x31":"=A" (x));
            return x;
        }

        // State
        bool            _running;
        uint64_t        _start;
        uint64_t        _end;
    };
#endif

} // namespace

#endif // Conjecture_CpuTimer_h

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