On 5/1/07, Sjodin, Jan <[EMAIL PROTECTED]> wrote:
Can someone give similar information about LTO? How many people (full/part time) and how long time it will take? How much work is LTO compared to the tuple representation?
A vast amount more if we're going to work on LTO with the current GIMPLE representation, because we'll end up rewriting almost all of it when the tuples representation is merged. ;-) More seriously: LTO is, by my uneducated guess, about the same amount of work as the tuples work. I'm assuming single-language LTO here, because cross-language LTO is far harder (by the time we get there, we'll be talking about fixing the Fortran front end to play nice with the call graph, defining some kind of type system, etc.). Personally, I think the most useful thing you could do at this point, is helping with the tuples repesentation, or helping with the preparations for LTO such as removing lang_hooks and perhaps some intermediate representation oddities like early uses of DECL_RTL (for e.g. register variables). I think Kenny has shown that an IL reader/writer is not an awful lot of work, but IMHO it will be corner cases like the ones I just mention that will take a little while to resolve. So, better start early, to make work easier later on. But as I said, that's just my uneducated guess. I haven't done any LTO work myself yet ;-) Gr. Stevem
