[PATCH] D154589: MIPS: setMaxAtomicSizeInBitsSupported to 0 for MIPS I

[YunQiang Su via Phabricator via llvm-commits]

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Since MIPS II, ldc1/sdc1 instructions introduced, which can be used
to load/store double float. And, in fact they can also be used to
load/store int64 by MEM <-> FPR <-> GPR on 32 bit CPU.

MIPS I has no ldc1/sdc1, so we have to use __atomic_load/store_*.

Fixes: #61166.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154589

Files:
  llvm/lib/Target/Mips/MipsISelLowering.cpp
  llvm/test/CodeGen/Mips/GlobalISel/llvm-ir/load_atomic-mips1.ll

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