#nmigen on 2020-05-12 — irc logs at freenode.irclog.whitequark.org

2020-01-27 18:31 ChanServ changed the topic of #nmigen to: nMigen hardware description language · code at https://github.com/nmigen · logs at https://freenode.irclog.whitequark.org/nmigen

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14:52 <_whitenotifier-c> [nmigen] rroohhh opened issue #385: Bad error message for duplicate ClockDomain - https://git.io/Jf8gV

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21:15 <ZirconiumX> Question: how do I implement comparison in terms of a subtraction? I've already got a giant 64-bit adder in my critical path, might as well put it to use

21:16 <ZirconiumX> If x - y < 0 (setting the carry bit) then x < y

21:16 <ZirconiumX> But signed comparison seems trickier

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22:29 <tpw_rules> as in V?

22:30 <tpw_rules> 2s complement overflow?

22:30 <ktemkin> look at how other ALUs generate their Signed Overflow bit

22:30 <whitequark> ZirconiumX: https://github.com/whitequark/Boneless-CPU/blob/master/boneless/gateware/alsru.py#L162-L167

22:31 <tpw_rules> mmh is there no way to view a pdf raw on github

22:31 <ktemkin> well, that saves me the hassle of typing an equivalent out

22:31 <tpw_rules> https://github.com/whitequark/Boneless-CPU/blob/master/doc/manual/manual.pdf anyway look at pages 12, 47, and the branches of your choice

22:42 <ZirconiumX> Oh, it's just the overflow flag. I thought it'd be trickier than that

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23:13 <mwk> hm? it's overflow XOR sign

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