[LLVMdev] Register Machine Pass

[Ryan Taylor]

Rafael,

 Ok. Looks like addPreRegAlloc is a valid back-end stage so that should be
fine. Also, I'm curious because none of the documentation/code samples I've
seen register machine passes this way. For example, HexagonHardwareLoops.

Thanks.


On Mon, Jul 14, 2014 at 1:21 PM, Rafael Auler <rafaelauler at gmail.com> wrote:

> Use llc -debug-pass=Structure to check if your pass is included in the
> back-end pipeline. You should register your pass using the same idiom to
> register a regular IR pass. Like this:
> static RegisterPass<MyMachinePass> X("mypass", "My Machine Pass");
>
> Check http://llvm.org/doxygen/classllvm_1_1TargetPassConfig.html to get
> an overview of the possible back-end stages where you can insert your pass
> via the addPrexxx() interface.
>
> Good luck,
> Rafael
>
>
> On Mon, Jul 14, 2014 at 2:07 PM, Justin Holewinski <jholewinski at nvidia.com
> > wrote:
>
>> On Mon, 2014-07-14 at 10:00 -0700, Ryan Taylor wrote:
>> > It's not being executed. I'm both trying to print via outs() and add
>> > info via STATISTIC, neither is occurring.
>>
>> Did you try running in a debugger to make sure addPass() is called?  Or
>> if a debugger is unavailable, putting an outs() statement with the
>> addPass() call?  That would at least rule out addPass() not being
>> called.
>>
>> >
>> > On Mon, Jul 14, 2014 at 12:22 PM, Justin Holewinski
>> > <jholewinski at nvidia.com> wrote:
>> >         On Mon, 2014-07-14 at 08:31 -0700, Ryan Taylor wrote:
>> >         > Where is the documentation about registering a machine pass?
>> >         I'm
>> >         > unable to find it.
>> >         >
>> >         >
>> >         > I have built a machine function pass similar to the one
>> >         found in
>> >         > HexagonHardwareLoops.cpp. So I have generated a machine
>> >         pass.cpp file,
>> >         > modified 'Target'.h and 'Target'TargetMachine.cpp (to add
>> >         pass via
>> >         > addPass() in the addPreRegAlloc()). All this builds/compiles
>> >         fine.
>> >         >
>> >         >
>> >         > When running llc the pass does not get executed.
>> >         >
>> >         >
>> >         > I seem to be missing some steps? Potentially registration of
>> >         the
>> >         > machine pass?
>> >
>> >
>> >         That should be all you need to do.    Are you running in a
>> >         debugger and
>> >         making sure your added addPass() call is actually being
>> >         executed?
>> >         >
>> >         >
>> >         > Thanks.
>> >
>> >
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