NaplesPUInstrInfo.td
From NaplesPU Documentation
NuPlusInstrInfo.td and NuPlusInstrFormats.td describe the nu+ instructions and the patterns to transform LLVM IR into machine code. The NuPlusInstrInfo.td contains the instructions definition and the patterns necessary for the translation from the LLVM IR to the nu+ machine code.
The files "compiler/include/llvm/Target/Target.td" and "compiler/include/llvm/Target/TargetSelectionDAG.td" contain the Tablegen classes used for the description.