Re: [scala-tools] Compiler books

> Thanks for the suggestions! I'll order some of these books.
>
> However, while they arrive, could someone give me a hint how to do
> scalar replacement in a transformer:
>
> // Given this method
> def compute(v1: Vector2) = { val v2 = v1 + 2f; v2 }
> // I want it to transform it to this
> def compute(v1: Vector2) = {
>  val v2$x = v1.x + 2f
>  val v2$y = v2.y + 2f
>  Vector2(v2$x, v2$y)
> }
> // Nevermind that in this particular case there is no performance
> improvement
>
> In a transformer if I match on ValDef(...) I can do the replacement,
> but what should I return?
> I must return a single tree, but I have two trees that need to replace
> the first one.
>
> Maybe I should do this with a different method, not with the tree
> transformer class?
> Or perhaps I should create a new tree subtype that is eliminated in a
> next phase?
>
> Sorry if these are dumb questions :)
>
> Erkki
>
> Erkki Lindpere wrote:
>> 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
>>
>