@Override
	protected AddressSetView toOverlay(AddressSetView set) {
		TraceMemorySpace ops = getMemoryOps(false);
		if (ops == null) {
			return null; // client should bail anyway
		}
		AddressSpace space = ops.getAddressSpace();
		return TraceRegisterUtils.getOverlaySet(space, set);
	}
Check if a register has a {@link TraceMemoryState#KNOWN} value for the given thread

@param thread the thread
@param register the register
@return true if known
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/pcode/exec/trace/data/DefaultPcodeTraceRegistersAccess.java