[PATCH] D146463: [CodeGen][RISCV] Change Shadow Call Stack Register to S11

[Alex Bradbury via Phabricator via cfe-commits]

asb added a comment.

In principle I think this is good, but I see two considerations:

1. Sam was right that there's an ability to change the register after the fact, but 2.5 years have passed since then. We should make a good faith attempt to see if any downstream users are relying on the current ABI (e.g. the original contributors - @zzheng and @apazos).
2. Now that the issue has been raised in the psABI / toolchain-sig, it would be good if there were consensus on the "platform register" rather than changing this multiple times if some different register is decided.

I'd hope we can resolve this quickly enough that we don't need to consider e.g. adding a way to select the shadow call stack register, but if you _need_ this quickly to iterate on Android/Fuchsia then that might be the easiest route to land something very rapidly.


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https://reviews.llvm.org/D146463