[PATCH] D143880: [LoongArch] Emit bytepick for picking from concatenation of two values

[WÁNG Xuěruì via Phabricator via llvm-commits]

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It seems the ISA manual's pseudo-code description for the
`BYTEPICK.[WD]` instructions is inaccurate; the behavior described here
should be correct though. The instructions' names are misleading too
(they pick full GRLen-wide words instead of bytes; they just index by
bytes) but let's stick to the official names for now.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143880

Files:
  llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
  llvm/test/CodeGen/LoongArch/bytepick.ll

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