[llvm-dev] Backend implementation for an architecture with only majority operation instruction

Sreejita saha via llvm-dev llvm-dev at lists.llvm.org
Thu Jun 1 20:13:52 PDT 2017

Hello everyone,

I was trying to create an LLVM backend for a processor with a very simple architecture and that does all instructions like load, store, arithmetic and logical instructions using a bunch of majority functions. The processor has only one instruction(majority function) in its ISA and breaks down all other instructions into a number of majority instructions depending on what instruction it is. All the instructions have different combinations of majority operations. Is there any way to implement this without creating a new Selection DAG node for the majority operation?
I was thinking of creation of a new Selection DAG node and mapping all the other instructions like loads, stores as pseudo instructions and breaking them up. Can someone please help me with this?


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