36 lines
736 B
C++
36 lines
736 B
C++
/*Allows you to time instructions.
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Results vary because the CPU does
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parallel and out-of-order execution.
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*/
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#define SAMPLE_SIZE 100000000
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U0 TimeIns()
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{
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I64 i,start,end,overhead_time,test_time;
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F64 d=5.0;
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Bool old_preempt=Preempt(OFF);
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//Measure Loop Overhead
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start=GetTSC;
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for (i=0;i<SAMPLE_SIZE;i++);
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end=GetTSC;
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overhead_time=end-start;
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"\nOverhead Cycles:%10.5f\n",ToF64(overhead_time)/SAMPLE_SIZE;
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start=GetTSC;
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for (i=0;i<SAMPLE_SIZE;i++) {
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#exe {OTraceMask(0b10000000000);OTrace(ON);};
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//Time these instructions
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d*=1.00001;
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#exe {OTrace(OFF);};
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}
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end=GetTSC;
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test_time=end-start;
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"Measured Cycles:%10.5f\n",ToF64(test_time-overhead_time)/SAMPLE_SIZE;
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Preempt(old_preempt);
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}
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TimeIns;
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