Hey twitterettes, I'm looking for a logic optimization tool that can create the most efficient expression that maps an n-bit input to a 1-bit output by specifying which input vectors that produce 1,0 or are allowed to be either. It takes time to do many of those by hand on paper
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N is usually five in this case since the input is mostly rv32 opcodes, sometimes paired with a bit or two extra. Not sure five is considered large in this context :)
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Yes. So any input bit that can be thrown away helps a lot
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And i most cases it works fine. E.g. a j type instruction can be uniquely identified by opcode6=1,4=0,1=1. Or the second alu operand is rs2 when opcode bit5 is set (disregarding illegal instructions)
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