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...you have a specific callback in TargetInstrInfo or similar in mind? I would expect them to either be used pre-ra or post-ra but not both... - Matthias -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180117/a40ea010/attachment.html>

Thanks Matthias, I have both a pre-RA and a post-RA scheduler, and I had thought that I could track “has RA happened?” by setting a flag in my pre-RA scheduler as it completes - my suspicion (which you have confirmed) was that “#vregs == 0” was not a safe assumption. What I cannot be sure of, is what passes execute after my pre-RA scheduler but before RA, and what passes execute after RA but

Please don't rely on this for checking whether regalloc was run: You can have functions without vregs pre-RA[1]. We don't need or should track state such as pre/post-RA as part of the function. Instead it really is a property of where a pass was scheduled, so the pass should know and not the function. I'd recommend simply creating a pre-RA and a post-RA pass instead of scheduling the