libkern/x86_64/OSAtomic.s standard libkern/zlib/intel/inffastS.s optional zlib libkern/zlib/intel/adler32vec.s optional zlib # Optimized WKdm compressor libkern/kxld/i386/WKdmCompress.s optional hibernation libkern/kxld/i386/WKdmDecompress.s optional hibernation