Discuss: Which version is "better" and why? How would you solve this?pic.twitter.com/KLuwMPRsoo
Neurodiverse trans geek girl. Yosys, RISC-V, SAT/SMT.
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Discuss: Which version is "better" and why? How would you solve this?pic.twitter.com/KLuwMPRsoo
I wish I knew. with blind ignorance I'd see which took the fewest LUTs
Depending on your target arch that would probably either be "check_en", or it wouldn't matter. But would you know what it does if you read it in someones code? Would you be able to spot an error?
There is no error. I've formally verified the three versions for logical equivalence. But the question is if you would spot one if the code would have a bug.
it takes some extrapolation and familiarity for _en to look obviously correct, _alt needs some knowledge about what happens w/ complement, _ref can just be read but seems like a juicy hazard for someone trying to be clever
Can you explain what you mean by _ref being a "juicy hazard for someone trying to be clever"?
Btw, _ref is arguably the most efficient implementation of the three for architectures with ripple adder cells when the synthesis tool can implement carry save adder trees for summing many small values.
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