static inline Tcl_WideInt
NativeCalc100NsOffs(
    LONGLONG ciPerfCounter,
    LONGLONG curCounter
) {
    curCounter -= ciPerfCounter; /* current distance */
    /* virtual time without offset (or nominal frequency equals 10000000) */
    if (!curCounter) {
    	return 0; /* virtual time without offset */
    if (!curCounter || timeInfo.nominalFreq == 10000000) {
	return (Tcl_WideInt)curCounter;
    }
    /* virtual time with offset */
    return curCounter * 10000000 / timeInfo.nominalFreq;
    /* virtual time with offset, try to avoid overflow in signed wide int */
    if (curCounter < WIDE_MAX / 10000000) {
	return (Tcl_WideInt)curCounter * 10000000 / timeInfo.nominalFreq;
    }
    return (Tcl_WideInt)(curCounter / ((double)timeInfo.nominalFreq / 10000000));
}

/*
 * Representing the number of 100-nanosecond intervals since posix epoch.
 */
static inline Tcl_WideInt
GetSystemTimeAsVirtual(void)