Instruction RDTSC works the same in long mode (64-bit) as it does in IA32
mode: the upper dword is in EDX and the lower dword is in EAX. Currently,
hwtime.h assumes that RAX contains the 64-bit value. However logical the
assumption, it is still incorrect.
Correct code:
#elif (defined(__GNUC__) && defined(__x86_64__))
__inline__ sqlite_uint64 sqlite3Hwtime(void){
unsigned int lo, hi;
__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
return (sqlite_uint64)hi << 32 | lo;
}
#elif (defined(__GNUC__) && defined(__ppc__))
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