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Provider cycleclock() for 32bit ARM targets #47358

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merged 1 commit into from
Nov 30, 2022
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Provider cycleclock() for 32bit ARM targets #47358

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23 changes: 23 additions & 0 deletions src/julia_internal.h
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,9 @@
#else
#define sleep(x) Sleep(1000*x)
#endif
#if defined(_CPU_ARM_)
#include <sys/time.h>
#endif

#ifdef __cplusplus
extern "C" {
Expand Down Expand Up @@ -216,6 +219,26 @@ static inline uint64_t cycleclock(void) JL_NOTSAFEPOINT
int64_t virtual_timer_value;
__asm__ volatile("mrs %0, cntvct_el0" : "=r"(virtual_timer_value));
return virtual_timer_value;
#elif defined(_CPU_ARM_)
// V6 is the earliest arch that has a standard cyclecount
#if (__ARM_ARCH >= 6)
uint32_t pmccntr;
uint32_t pmuseren;
uint32_t pmcntenset;
// Read the user mode perf monitor counter access permissions.
asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r"(pmuseren));
if (pmuseren & 1) { // Allows reading perfmon counters for user mode code.
asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r"(pmcntenset));
if (pmcntenset & 0x80000000ul) { // Is it counting?
asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(pmccntr));
// The counter is set up to count every 64th cycle
return (int64_t)(pmccntr) * 64; // Should optimize to << 6
}
}
#endif
struct timeval tv;
gettimeofday(&tv, NULL);
return (int64_t)(tv.tv_sec) * 1000000 + tv.tv_usec;
#elif defined(_CPU_PPC64_)
// This returns a time-base, which is not always precisely a cycle-count.
// https://reviews.llvm.org/D78084
Expand Down