[PATCH] D159183: [LoongArch] Support llvm.is.fpclass for f32 and f64

[Lu Weining via Phabricator via llvm-commits]

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The result encoding (least significant 10-bits) of `fclass.[sd]` [1]
exactly matches the second argument definition of llvm intrinsic
`llvm.is.fpclass`. So we can simply select:

is_fpclass (fj, mask)
->
sltu (r0, and (movfr2gr.[sd] (fclass.[sd] fj), mask))

[1]: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#_fclass_sd


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159183

Files:
  llvm/lib/Target/LoongArch/LoongArchFloat32InstrInfo.td
  llvm/lib/Target/LoongArch/LoongArchFloat64InstrInfo.td
  llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
  llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
  llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
  llvm/test/CodeGen/LoongArch/is_fpclass_f32.ll
  llvm/test/CodeGen/LoongArch/is_fpclass_f64.ll

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