unsigned GetKnownReg (unsigned Use, const struct RegContents* RC);
/* Return the register or zero page location from the set in Use, thats
* contents are known. If Use does not contain any register, or if the
unsigned GetKnownReg (unsigned Use, const struct RegContents* RC);
/* Return the register or zero page location from the set in Use, thats
* contents are known. If Use does not contain any register, or if the