Merge pull request #708 from andyvand/master

Fix timestamp arm64

src/utils/timeStamp.cpp

@@ -19,12 +19,30 @@
 #include <intrin.h>
 #pragma intrinsic(__rdtsc)
 #else
+#if defined(__x86_64_) || defined(__i386__)
 #include <x86intrin.h>
 #endif
+#endif
 
 static uint64_t rdtsc()
 {
+#if defined(__arm64__) || defined(__arm__)
+    // SPDX-License-Identifier: GPL-2.0
+    uint64_t val = 0;
+
+    /*
+     * According to ARM DDI 0487F.c, from Armv8.0 to Armv8.5 inclusive, the
+     * system counter is at least 56 bits wide; from Armv8.6, the counter
+     * must be 64 bits wide.  So the system counter could be less than 64
+     * bits wide and it is attributed with the flag 'cap_user_time_short'
+     * is true.
+     */
+    asm volatile("mrs %0, cntvct_el0" : "=r" (val));
+
+    return val;
+#else
 	return __rdtsc();
+#endif
 }
 #endif