public boolean isFullMask() {
		if (offset != 0) {
			return false;
		}
		for (byte element : mask) {
			if (element != (byte) 0xff) {
				return false;
			}
		}
		return true;
	}
Check if there are any unknown bits

@return true if no unknown bits are present, false otherwise
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/sem/AssemblyPatternBlock.java