@Override
	public Pattern doAnd(Pattern b, int sa) {
		if (!(b instanceof ContextPattern)) {
			return b.doAnd(this, -sa);
		}

		PatternBlock resblock = maskvalue.andBlock(((ContextPattern) b).maskvalue);
		return new ContextPattern(resblock);
	}
Pattern which depends only on the non-instruction stream bits
of the context
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/processors/sleigh/pattern/ContextPattern.java