[LLVMdev] Dynamic Optimization Infrastructure

[Evan Cheng]

On Oct 3, 2008, at 3:14 PM, Yale Zhang wrote:

> Does anyone know if LLVM will soon have a dynamic optimization  
> infrastructure, namely support to generate trampolines back to the  
> JIT/execution manager that get run when a piece of code's frequency  
> exceeds a threshold? I see that there already is a  
> relinkAndRecompileFunction in the JIT, which will be useful. Rather  
> than roll my own mechanisms and have to worry about jumping back to  
> code that gets replaced, are there already works in progress?

Not that I am aware of. Although there appears to be considerable  
interests in this. Patches welcome.

>
>
> Also, is there a way to generate platform independent trampolines  
> (e.g. generate IR that calls a function pointer to the execution  
> engine I want to go to). LLVM seems to be pretty strict about type  
> casts, so I was afraid I wouldn't be able to generate a function  
> pointer initialized to arbitrary data.

Not sure if this is what you are looking for:
http://llvm.org/docs/LangRef.html#int_trampoline

Evan

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