llvm dev - Dec 2013 - [LLVMdev] running optimization pass in lli tool

Hello,

I'm currently trying to implement a new loop optimization pass in the LLVM.

Till now, I'm using the 'opt' tool to run my pass. But, I need to
include my
pass in the MCJIT pass sequence.

I can't find a command option in the 'lli' tool to include any loop
optimization pass. 

For example, I can't include the '-loop-rotate' pass in JIT to be
performed
at runtime.

In my case, does it require a code modification? Where?

Please advice

 

Sara Elshobaky

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Sara,

If I'm interpreting your question correctly, I believe you may be 
misinterpreting the intended usage of MCJIT.  Generally, you would run 
your chosen collection of function passes before passing the Module to 
MCJIT to compile.  MCJIT does have an OptLevel, but this controls 
relatively low level optimizations during code generation not high level 
transforms like your describing.

I'd recommend taking a look at 
examples/Kaleidoscope/MCJIT/complete/toy.cpp for an example of how this 
can be structured.

Yours,
Philip

On 12/28/2013 09:06 PM, Sara Elshobaky wrote:
> Hello,
>
> I’m currently trying to implement a new loop optimization pass in the LLVM.
>
> Till now, I’m using the ‘opt’ tool to run my pass. But, I need to
> include my pass in the MCJIT pass sequence.
>
> I can’t find a command option in the ‘lli’ tool to include any loop
> optimization pass.
>
> For example, I can’t include the ‘-loop-rotate’ pass in JIT to be
> performed at runtime.
>
> In my case, does it require a code modification? Where?
>
> Please advice
>
> Sara Elshobaky
>
>
>
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>