forked from OSchip/llvm-project
29 lines
654 B
C
29 lines
654 B
C
#include <mach/mach_time.h>
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#include <stdint.h>
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#include <stdlib.h>
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double intervalInCycles( uint64_t startTime, uint64_t endTime )
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{
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uint64_t rawTime = endTime - startTime;
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static double conversion = 0.0;
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if( 0.0 == conversion )
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{
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mach_timebase_info_data_t info;
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kern_return_t err = mach_timebase_info( &info );
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if( 0 != err )
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return 0;
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uint64_t freq = 0;
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size_t freqSize = sizeof( freq );
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int err2 = sysctlbyname( "hw.cpufrequency", &freq, &freqSize, NULL, 0L );
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if( 0 != err2 )
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return 0;
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conversion = (double) freq * (1e-9 * (double) info.numer / (double) info.denom);
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}
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return (double) rawTime * conversion;
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}
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