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* As an exception, if every logical processor on the system
* is on the same chip, we use the performance counter anyway,
* presuming that everyone's TSC is locked to the same
* oscillator.
*/
SYSTEM_INFO systemInfo;
unsigned int regs[4];
int regs[4];
GetSystemInfo(&systemInfo);
if (TclWinCPUID(0, regs) == TCL_OK
&& regs[1] == 0x756e6547 /* "Genu" */
&& regs[3] == 0x49656e69 /* "ineI" */
&& regs[2] == 0x6c65746e /* "ntel" */
&& TclWinCPUID(1, regs) == TCL_OK
&& ((regs[0]&0x00000F00) == 0x00000F00 /* Pentium 4 */
|| ((regs[0] & 0x00F00000) /* Extended family */
&& (regs[3] & 0x10000000))) /* Hyperthread */
&& (((regs[1]&0x00FF0000) >> 16)/* CPU count */
== systemInfo.dwNumberOfProcessors)) {
== (int)systemInfo.dwNumberOfProcessors)) {
timeInfo.perfCounterAvailable = TRUE;
} else {
timeInfo.perfCounterAvailable = FALSE;
}
}
#endif /* above code is Win32 only */
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