[PATCH] D137004: [LoongArch] Added spill/reload/copy support for CFRs

[wanglei via Phabricator via llvm-commits]

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1, spill/reload
When a function call is made immediately after a floating point
comparison, the result of the comparison needs to be spilled before
function call and reloaded after the function returns.

2, copy
Support `GPR` to `CFR` and `CFR` to `GRP` copys. Therefore, the correct
register class can be used in the pattern template, and the hard-coding
of mutual coping of `CFR` and `GRP` is eliminated, reducing redundant
comparison instructions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137004

Files:
  llvm/lib/Target/LoongArch/LoongArchFloat32InstrInfo.td
  llvm/lib/Target/LoongArch/LoongArchFloat64InstrInfo.td
  llvm/lib/Target/LoongArch/LoongArchInstrInfo.cpp
  llvm/lib/Target/LoongArch/LoongArchRegisterInfo.cpp
  llvm/test/CodeGen/LoongArch/ir-instruction/fcmp-dbl.ll
  llvm/test/CodeGen/LoongArch/ir-instruction/fcmp-flt.ll
  llvm/test/CodeGen/LoongArch/ir-instruction/float-convert.ll
  llvm/test/CodeGen/LoongArch/spill-reload-cfr.ll

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