llvm dev - Sep 2019 - What's the best way to describe a non-operand flag field in instructions?

Hello,

I'm working with a new ISA. In this ISA, some instructions have some flag
bits that control the behavior of the instruction.

If I enumerate all of the bits, there will be 2^N (N is the number of
flags) instructions to write in the td file. Currently In my code,
these kind of instructions are written as "(outs Reg:$rt), (ins Reg:$rs,
Reg:$rd, Flag:$flag)" and there is another method to
decode the flag and print it to asm. However, I think it not so elegant,
and I can not reuse it for CodeGen.

Is there any better way to work with this situation?

Thanks,
Iru

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