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Hi, while implementing SystemZTTI:getCacheSize(), it became clear that there really isn't a simple way to just ask the Subtarget for the current subtarget machine model. I was thinking like something of an enum that would also reflect the subtarget series (and would allow >= and similar operations). I would like to ask what the ideas are on how this should be done best. Some

...n't capture heterogeneity at all, not because we're not > interested but simply because our compiler captures that at a higher > level outside of LLVM. AFAIK it is not handled at all. Any architecture that supports big.LITTLE will return 0 on getCacheLineSize(). See AArch64Subtarget::initializeProperties(). > > * write-back / write-through write buffers > > Do you mean for caches, or something else? https://en.wikipedia.org/wiki/Cache_%28computing%29#Writing_policies Basically, with write-though, every store is a non-temporal store (Or temporal stores being a write-through, depen...

Hi, thank you for sharing the system hierarchy model. IMHO it makes a lot of sense, although I don't know which of today's passes would make use of it. Here are my remarks. I am wondering how one could model the following features using this model, or whether they should be part of a performance model at all: * ARM's big.LITTLE * NUMA hierarchies (are the NUMA domains