It should be noted however that Bulldozer is hand-drawn/hand-custom/hand-crafted and not synthesized like Bobcat, Jaguar, or Zen. The automation detailed didn't actually start till Steamroller. Even then, it is specifically mentioned that is only semi-hand-custom, not wholly synthesized like BT, JG, ZN.
Bulldozer/Piledriver => Hand-drawn for maximum speed and density in 32nm.
Steamroller => The same blocks again, but rebuilt using the 13-track library in 28nm.
Excavator => The same blocks again, but rebuilt using the 9-track library in 28nm.