[all-commits] [llvm/llvm-project] d20c54: [LoongArch] Override TargetFrameLowering::spillCal...

[wanglei via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d20c54cbdb9a4a12bbfb1d51c72e52abd3f039a6
      https://github.com/llvm/llvm-project/commit/d20c54cbdb9a4a12bbfb1d51c72e52abd3f039a6
  Author: wanglei <wanglei at loongson.cn>
  Date:   2022-11-10 (Thu, 10 Nov 2022)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchFrameLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchFrameLowering.h
    A llvm/test/CodeGen/LoongArch/spill-ra-without-kill.ll

  Log Message:
  -----------
  [LoongArch] Override TargetFrameLowering::spillCalleeSavedRegisters

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
```

Reviewed By: SixWeining

Differential Revision: https://reviews.llvm.org/D137387