[PATCH] D67580: [AArch64][GlobalISel] Support -tailcallopt

[Jessica Paquette via Phabricator via llvm-commits]

paquette created this revision.
paquette added a reviewer: aemerson.
Herald added subscribers: Petar.Avramovic, hiraditya, kristof.beyls, rovka.
Herald added a project: LLVM.

This adds support for `-tailcallopt` tail calls to CallLowering. This piggy-backs off the changes from D67577 <https://reviews.llvm.org/D67577>, since doing it without a bit of refactoring gets extremely ugly.

Support is basically ported from AArch64ISelLowering. The main difference here is that tail calls in `-tailcallopt` change the ABI, so there's some extra bookkeeping for the stack.

Show that we are correctly lowering these by updating tail-call.ll.

Also show that we don't do anything strange in general by updating fastcc-reserved.ll, which passes `-tailcallopt`, but doesn't emit any tail calls.


https://reviews.llvm.org/D67580

Files:
  llvm/lib/Target/AArch64/AArch64CallLowering.cpp
  llvm/test/CodeGen/AArch64/fastcc-reserved.ll
  llvm/test/CodeGen/AArch64/tail-call.ll

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