public int getIndex(int index_bits) {
		return index_and_mask & IndexBssUtilities.indexMask(index_bits);
	}
See https://android.googlesource.com/platform/art/+/master/runtime/index_bss_mapping.h
Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/android/oat/IndexBssMappingEntry.java