[LLVMdev] Online opt style code pass / profiling possible in LLVM JIT?

[Reid Kleckner]

On Mon, Mar 29, 2010 at 9:05 AM, Puyan Lotfi <puyan at gatech.edu> wrote:
> Hi
>
> I am not sure if it is possible to do something similar to what the
> LLVM pass framework offers (via the opt program) but in the JIT
> instead (when running lli).
>
> Is it possible to do any kind of online profiling (or optimization) of
> dynamically compiler code similar to writing an opt style code pass
> module? Or would I have to change a lot of stuff in the JIT?

Sure, you can use all of LLVM's optimizations in lli via -O.
Alternatively you can create the JIT yourself and adjust the list of
optimization passes by hand.  Online profiling and feedback directed
optimization are not implemented.

Reid