There is some, but most of that actually gets pulled into standard cell libraries (the gate libraries), which are very big collections of primitives. Most of t

There is some, but most of that actually gets pulled into standard cell libraries (the gate libraries), which are very big collections of primitives. Most of them have a lot more than just the standard gates you think of - they include many 3-input gates, adder cells, multiplexer cells, flip flops of all kinds, and all sorts of other basic building blocks that are micro-optimized. They tend to use a standard width of 7 or 9 "tracks," where a track is defined by the width of the lowest metal layer, and the optimization comes from reducing the length of the gate. They also have gates of different sizes/strengths, so you can use the weak and small version on paths that are not critical, and the bigger and faster versions on critical paths.