very strange QuartusII 7.1 synthesis Tool results

Your files are the same on Quartus 7.2, I don't have a 7.1 anymore. It's going to be a little volatile, because the edit isn’t fixing the underlying redundancy. It just put the signals on a platter for synthesis to find.

To think about heuristic minimization – Heuristic means that the synthesis tool is going to take a quick look at the design for things to minimize. If it sees the redundancy you get a bonus. If it doesn’t you’re no worse off than you came in. The best to worst spread here is the difference between finding all the redundancy and none of it.

What’s the target application? You can probably get smaller and faster if some of these requirements can be tweaked. Tweak it enough and you can get into RAM, which sounds like the way to go personally.