[PATCH] D143710: [LoongArch] Emit addu16i.d for simple adds with eligible immediates

[WÁNG Xuěruì via Phabricator via llvm-commits]

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Ideally `addu16i.d` could be paired with `{ld,st}ptr` insns for faster
memory accesses with 32-bit-aligned offsets, or with `addi` for adding
a wider range of immediates (basically resembling `0xAAAA0BBB` in
non-edge cases), but these cases would require more work. These will be
added later.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143710

Files:
  llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
  llvm/test/CodeGen/LoongArch/ir-instruction/add.ll

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