llvm dev - Jun 2012 - [LLVMdev] Why some registered passes are not available through opt?

Dear LLVM,

I'm trying to understand why opt tool does not know some of the
registered passes, for example, -targetpassconfig, -gc-lowering,
-unreachableblockelim, -unreachableblockelim, -stack-protector,
-machinemoduleinfo. This prevents me from using bugpoint to reduce the
crash in backend. As I understand, they should be registered and
available through the command line in the same way as all other
passes, shouldn't they?

Thanks,
- Dima.

Hi Dima,
> I'm trying to understand why opt tool does not know some of the
> registered passes, for example, -targetpassconfig, -gc-lowering,
> -unreachableblockelim, -unreachableblockelim, -stack-protector,
> -machinemoduleinfo. This prevents me from using bugpoint to reduce the
> crash in backend. As I understand, they should be registered and
> available through the command line in the same way as all other
> passes, shouldn't they?
these are codegen passes not IR passes, and thus are available from llc
not opt.

Ciao, Duncan.

Hi Duncan,

Is it correct that opt does not understand codegen passes, but llc
understands both analysis/transformation and codegen passes? I would
like to modify bugpoint to work on this end.

Thanks,
- D.

2012/6/29 Duncan Sands <baldrick at free.fr>:
> Hi Dima,
>
>> I'm trying to understand why opt tool does not know some of the
>> registered passes, for example, -targetpassconfig, -gc-lowering,
>> -unreachableblockelim, -unreachableblockelim, -stack-protector,
>> -machinemoduleinfo. This prevents me from using bugpoint to reduce the
>> crash in backend. As I understand, they should be registered and
>> available through the command line in the same way as all other
>> passes, shouldn't they?
>
> these are codegen passes not IR passes, and thus are available from llc
> not opt.
>
> Ciao, Duncan.
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