[LLVMdev] outlining in llvm

[Philip Reames]

On 12/31/2014 12:49 PM, Tehila Mayzels wrote:
>
> Hi,
>
> I have some questions regarding outlining (extracting piece of code 
> into a function):
>
> 1.Is there an outlining pass in llvm (IR)? I've found out 
> CodeExtractor pass, but I'm not sure it’s exactly the same idea.
>
To my knowledge, there is not an existing outlining pass in tree. Most 
of the functionality to write one could probably be found in various 
places, but the profitability heuristics are entirely missing.  One 
reasonable starting point might be the MergeFunctions pass.
>
> 2.How do I set the function name?
>
> And another question:
>
> Where do I control the execution of my pass? I'm writing a pass that 
> first works on loops, than on a function (outlined from the loop) and 
> then again on loops.
>
> How can I do that?
>
This ordering isn't a natural thing to express in LLVM's pass 
structure.  You'll probably need to use a Module pass since that's the 
only type allowed to modify other functions.  (A loop pass will not work 
for this.)

> Thanks and happy new year,
>
> Tehila.
>
>
>
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