What about the more simpler
unsigned a, d;
__asm__ volatile("rdtsc" : "=a" (a), "=d" (d));
value= ((unsigned long long)a) | (((unsigned long long)d) << 32);which should work for both x86 and x86_64 according to https://web.archive.org/web/20161215213659/http://www.cs.wm.edu/~kearns/001lab.d/rdtsc.html ?
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