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Hi Andy, Andrew Trick wrote: >> But for the purposes of this discussion, only the legality (or lack >> thereof) of the above transform matters, not whether it is profitable >> or not. > > Given that you will need to disable the transform for GCRefs, it’s interesting that if it’s only something that needs to run before ISEL then you’re not actually losing any

...undamental way, and therefore has a high bar > for acceptance. > > Here is a summary of the alternative solutions that were proposed here > and on IRC (thanks Chandler, Andy, Eli!): > > 1. Model loads and stores of GC references as intrinsic calls: add > llvm.gc_load, llvm.gc_store intrinsics, and optimize them as loads > and stores whenever appropriate and legal. > > 2. Introduce a flag on load and stores that either > a. Denotes a "gc_safety" control dependence. > b. Denotes a "blackbox_safety" control dependence. In this...