[LLVMdev] Register Machine Pass

[Rafael Auler]

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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