[PATCH] D138696: [PowerPC] Exploit test data class instruction for isinf/iszero

[Qiu Chaofan via Phabricator via llvm-commits]

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Since ISA 3.0, we have test data class instruction (`x(s|v)tstdc(s|d|q)p`) to classify a floating point value, which can be used to combine common FP classify operations like `isinf` or zero comparison.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D138696

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/test/CodeGen/PowerPC/fp-classify.ll
  llvm/test/CodeGen/PowerPC/is_fpclass.ll

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