[PATCH] D137387: [LoongArch] Override TargetFrameLowering::spillCalleeSavedRegisters

[wanglei via Phabricator via llvm-commits]

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When using `llvm.returnaddress` intrinsic, special handling is required
for the spill of the `RA` register. Otherwise it will cause the verifier
fail in some cases (e.g. pr17377.c of the GCC C Torture Suite).

Specifically:

  *** Bad machine code: Using an undefined physical register ***
  - function:    f
  - basic block: %bb.0 entry (0xd94d18)
  - instruction: ST_D killed $r1, $r22, -40 :: (store (s64) into %stack.2)
  - operand 0:   killed $r1


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137387

Files:
  llvm/lib/Target/LoongArch/LoongArchFrameLowering.cpp
  llvm/lib/Target/LoongArch/LoongArchFrameLowering.h
  llvm/test/CodeGen/LoongArch/spill-ra-without-kill.ll

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