[LLVMdev] Register Machine Pass

[Ryan Taylor]

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?

Thanks.
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