wanglei 0e4378c55e [LoongArch] Add emergency spill slot for CFR spill/reload ...

When all registers have been allocated and CFR needs to be saved on the
stack, an emergency spill slot is required. Because CFR's spill and
reload require a general purpose register to transfer.

The attached test case was bugpoint-reduced down from
`MultiSource/Benchmarks/mafft/Lalignmm.c` in the test-suite.
Without this patch, llc will crash and report the following errors:

```
LLVM ERROR: Error while trying to spill R4 from class GPR: Cannot scavenge register without an emergency spill slot!
```

Reviewed By: SixWeining

Differential Revision: https://reviews.llvm.org/D138007

2022-11-19 14:35:31 +08:00

20 KiB

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