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Get cycle count from ARM64 PMCCNTR_EL0 register

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Niyas Sait 2021-11-15 09:10:47 +00:00
parent 329824cafe
commit e9f86fee61
1 changed files with 6 additions and 5 deletions
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11
src/clock.cpp
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@ -244,11 +244,12 @@ uint64_t zmq::clock_t::rdtsc ()
#elif defined(_MSC_VER) && defined(_M_ARM) // NC => added for windows ARM #elif defined(_MSC_VER) && defined(_M_ARM) // NC => added for windows ARM
return __rdpmccntr64 (); return __rdpmccntr64 ();
#elif defined(_MSC_VER) && defined(_M_ARM64) // NC => added for windows ARM64 #elif defined(_MSC_VER) && defined(_M_ARM64) // NC => added for windows ARM64
//return __rdpmccntr64 (); const int64_t pmccntr_el0 = (((3 & 1) << 14) | // op0
//return __rdtscp (nullptr); ((3 & 7) << 11) | // op1
// todo: find proper implementation for ARM64 ((9 & 15) << 7) | // crn
static uint64_t snCounter = 0; ((13 & 15) << 3) | // crm
return ++snCounter; ((0 & 7) << 0)); // op2
return _ReadStatusReg(pmccntr_el0);
#elif (defined __GNUC__ && (defined __i386__ || defined __x86_64__)) #elif (defined __GNUC__ && (defined __i386__ || defined __x86_64__))
uint32_t low, high; uint32_t low, high;
__asm__ volatile("rdtsc" : "=a"(low), "=d"(high)); __asm__ volatile("rdtsc" : "=a"(low), "=d"(high));