[llvm-dev] Rerunning TailCallElim at a later stage

[Nat! via llvm-dev]

Hi

from what I have figured out, the pass "TailCallElim" is being done in 
what I would call the "opt" phase of optimization. The "StackColoring" 
is being done in the "llc" phase. opt -> llc, so TailCallElim is always 
ahead.

Now I would like to add something (my reusealloca idea) in 
"StackColoring" to get rid of some allocas, which inhibit "TailCallElim".

* Is it possible to rerun (if even possible at that stage) the 
"TailCallElim" at this stage ?

* Is it possible to make "StackColoring" into an "opt" pass and try to 
get it ahead of "TailCallElim" ? I guess not, though I can see how 
"RegisterColoring" is dependent on architecture, but I don't really see 
it for allocas.

Ciao
    Nat!

P.S. AU.addRequired<TailCallElim>(); would not work BTW.