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54 lines
1.2 KiB
C++
54 lines
1.2 KiB
C++
// This code is in the public domain -- castano@gmail.com
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#pragma once
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#ifndef NV_CORE_TIMER_H
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#define NV_CORE_TIMER_H
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#include "nvcore.h"
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#if NV_CC_MSVC
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#include <intrin.h>
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#endif
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namespace nv {
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#if NV_CC_MSVC
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NV_FORCEINLINE uint64 fastCpuClock() { return __rdtsc(); }
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#elif NV_CC_GNUC && NV_CPU_X86
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NV_FORCEINLINE uint64 fastCpuClock() {
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uint64 val;
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__asm__ volatile (".byte 0x0f, 0x31" : "=A" (val));
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return val;
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}
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#elif NV_CC_GNUC && NV_CPU_X86_64
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NV_FORCEINLINE uint64 fastCpuClock() {
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uint hi, lo;
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__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
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return uint64(lo) | (uint64(hi) << 32);
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}
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#else
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NV_FORCEINLINE uint64 fastCpuClock() { return 0; }
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#endif
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uint64 systemClockFrequency();
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uint64 systemClock();
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class NVCORE_CLASS Timer
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{
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public:
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Timer() {}
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void start() { m_start = systemClock(); }
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void stop() { m_stop = systemClock(); }
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float elapsed() const { return float(m_stop - m_start) / systemClockFrequency(); }
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private:
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uint64 m_start;
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uint64 m_stop;
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};
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} // nv namespace
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#endif // NV_CORE_TIMER_H
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