[llvm-dev] Annotating DAG with locations for specific machine instructions

[Tyro Software via llvm-dev]

I have a target-specific LoopPass which checks loops to see whether some
machine-specific instructions can be profitably used and needs to mark them
in a way that can easily be seen during machine instruction lowering. So
what I imagine could work is inserting pseudo-instructions, e.g. at the end
of the loop header - but I haven't seen how to do this through IRBuilder or
recognized an equivalent action being performed on other targets. Please
point me at an example of this approach (or educate me on why it's never
going to work...)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20160829/afc4e4b9/attachment.html>