33 lines
837 B
C++
33 lines
837 B
C++
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#ifndef _TSC_TIMER_H
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#define _TSC_TIMER_H
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namespace glim {
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extern "C" { // http://en.wikipedia.org/wiki/Rdtsc
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#if (defined(__GNUC__) || defined(__ICC)) && defined(__i386__)
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static __inline__ unsigned long long rdTsc(void) {
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unsigned long long ret;
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__asm__ __volatile__("rdtsc": "=A" (ret));
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return ret;
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}
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#elif (defined(__GNUC__) || defined(__ICC) || defined(__SUNPRO_C)) && defined(__x86_64__)
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static __inline__ unsigned long long rdTsc(void) {
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unsigned a, d;
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asm volatile("rdtsc" : "=a" (a), "=d" (d));
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return ((unsigned long long)a) | (((unsigned long long)d) << 32);
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}
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#endif
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}
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//! CPU cycles timer. Fast, not safe.
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//! cf. http://en.wikipedia.org/wiki/Rdtsc
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struct TscTimer {
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int64_t start;
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TscTimer (): start (rdTsc()) {}
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int64_t operator()() const {return rdTsc() - start;}
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};
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}
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#endif // _TSC_TIMER_H
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