newlib/libc/machine/nvptx/clock.c

   1 /* clock.c
   2  * Support file for nvptx in newlib.
   3  */
   4 #include <time.h>
   5
   6 clock_t
   7 clock ()
   8 {
   9   unsigned long long now;
  10 #if __PTX_SM__ >= 310
  11   asm volatile("mov.u64 %0, %%globaltimer;" : "=r"(now));
  12   return now/((1000000000ull)/CLOCKS_PER_SEC);
  13 #else
  14   asm volatile("mov.u64 %0, %%clock64;" : "=r"(now));
  15   // Assume a GPU base clock frequency of 1250MHz.
  16   return now/((1250000000ull)/CLOCKS_PER_SEC);
  17 #endif
  18 }