[PATCH] D67245: [AArch64][GlobalISel] Always fall back on tail calls with -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, javed.absar, rovka.
Herald added a project: LLVM.

`-tailcallopt` requires that we perform different stack adjustments than with sibling calls. For example, the `@caller_to0_from8` function in test/CodeGen/AArch64/tail-call.ll requires that we adjust SP. Without `-tailcallopt`, this adjustment does not happen. With it, however, it is expected.

So, to ensure that adding sibling call support doesn't break `-tailcallopt`, make CallLowering always fall back on possible tail calls when `-tailcallopt` is passed in.

Update test/CodeGen/AArch64/tail-call.ll with a GlobalISel line to make sure that we get the correct code for tail calls with -tailcallopt.


https://reviews.llvm.org/D67245

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

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