[PATCH] D138021: [LoongArch] Support parsing la* pseudo instructions

[wanglei via Phabricator via llvm-commits]

wangleiat created this revision.
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This patch makes `IAS` compatible with `GAS`. It accepts `la*` pseudo
instructions. And expands `la{,.local,.global}` into different
instructions according to different features.

  Default:
      la = la.global = la.got
      la.local = la.pcrel
  With feature "+la-global-with-pcrel":
      la = la.global = la.pcrel
  With feature "+la-global-with-abs":
      la = la.global = la.abs
  With feature "+la-local-with-abs":
      la.local = la.abs
  With features "+la-global-with-pcrel,+la-global-with-abs"(disorder):
      la = la.global = la.pcrel

Note: To keep consistent with `GAS` behavior, the "la" can only have

  one register operand.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D138021

Files:
  llvm/lib/Target/LoongArch/AsmParser/LoongArchAsmParser.cpp
  llvm/lib/Target/LoongArch/LoongArch.td
  llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
  llvm/lib/Target/LoongArch/LoongArchSubtarget.h
  llvm/test/MC/LoongArch/Macros/aliases-la-bad.s
  llvm/test/MC/LoongArch/Macros/aliases-la.s
  llvm/test/MC/LoongArch/Macros/macros-la-bad.s
  llvm/test/MC/LoongArch/Macros/macros-la.s

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