llvm dev - Jan 2017 - Enabling an individual pass in llc

Hello.
     Could you please tell me how can I enable a specific pass in llc, at the
command
line? (As far as I can see, there is the file lib/CodeGen/TargetPassConfig.cpp
handling
all llc passes, but I prefer not making some changes in that file or connected
files.)
     I am interested in enabling the MachineLICM pass to optimize loops, while
giving llc
-O0. I am currently using llc -O0, since if I am using -O1 I get some strange
instruction
selection errors...

     Note that llc -help-hidden does not mention about any argument to enable
the machine
LICM pass, although there is a -disable-machine-licm flag. Also, llc -O0 
-debug-pass=Arguments shows at standard output in the "Pass
Arguments:" section that -O0
does not run LICM, while with -O1 flag it does have LICM.

   Thank you,
     Alex

On 1/29/2017 2:31 AM, Alex Susu via llvm-dev wrote:
>
>     Could you please tell me how can I enable a specific pass in llc, at
> the command line?
You can only do that with .mir inputs via -run-pass.

-Krzysztof

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