19 lines
410 B
C
19 lines
410 B
C
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/* clock.c
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* Support file for nvptx in newlib.
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*/
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#include <time.h>
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clock_t
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clock ()
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{
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unsigned long long now;
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#if __PTX_SM__ >= 310
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asm volatile("mov.u64 %0, %%globaltimer;" : "=r"(now));
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return now/((1000000000ull)/CLOCKS_PER_SEC);
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#else
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asm volatile("mov.u64 %0, %%clock64;" : "=r"(now));
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// Assume a GPU base clock frequency of 1250MHz.
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return now/((1250000000ull)/CLOCKS_PER_SEC);
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#endif
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}
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