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Full 64-bit register is set by rdtsc.
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@ -110,10 +110,14 @@ public:
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# endif
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# elif defined _WIN32 || defined __CYGWIN__
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return int64_t( __rdtsc() );
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# elif defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64
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# elif defined __i386 || defined _M_IX86
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uint32_t eax, edx;
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asm volatile ( "rdtsc" : "=a" (eax), "=d" (edx) );
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return ( uint64_t( edx ) << 32 ) + uint64_t( eax );
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# elif defined __x86_64__ || defined _M_X64
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uint64_t rax, rdx;
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asm volatile ( "rdtsc" : "=a" (rax), "=d" (rdx) );
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return ( rdx << 32 ) + rax;
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# endif
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#else
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return std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now().time_since_epoch() ).count();
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