[scala-tools] Compiler books

Can anyone recommend a good book or online resource on compilers that
would help understand the Scala compiler?

I want to create a plug-in that does vector math optimizations*, but
I've never studied compilers and many things in the compiler seem really
foreign to me.

* I think scalar replacement is what it's called -- given the type
Vector2(x: Float, y: Float) { /* operations */ }, I want to replace
1) local variables:
  val v = new Vector2(1f, 2f)  -->  val v$x = 1f; val v$y = 2f
2) any operations on Vectors with operations on Floats
3) any escaping vectors with new Vector2(v$x, v$y) -- most of the time
they will not escape

Or should I just wait until JIT can do this better? :)

Erkki