me: *reading someone else's verilog*
@qyriad: w-what does the ^ mean... ?
me: ... which one?
@qyriad: nope; I no longer want to knowpic.twitter.com/IYnPnqu8C8
Neurodiverse trans geek girl. Yosys, RISC-V, SAT/SMT.
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me: *reading someone else's verilog*
@qyriad: w-what does the ^ mean... ?
me: ... which one?
@qyriad: nope; I no longer want to knowpic.twitter.com/IYnPnqu8C8
I *know*, right
I didn't even know you could use ^ both as unary or binary operator !?
verilog's reduction operators are one of it's neater quirks (^a[3:0] is equivalent to ^'ing together all of the bits of a)
Fun fact: prefix-& is great for exposing bugs in compilers that have to do with self sized expressions. For ex: &(0?a[1:2]:a[0]) should compile to constant zero and not a[0], but some tools eagerly optimize the 0?x:y pattern, screwing up the width of the self sized expression.
W T everloving F?
would it be more obvious what the behavior should be if it were &(0 ? a[1:0] : {1‘b0, a[0]}) ?
I wasn't surprised at the result. I am surprised that anyone who actually works on developer tools could totally fail to consider an expression's type.
And the way @oe1cxw said it, it sounds like more than one team has made that mistake.
Yes, I have found this exact bug in different tools that afaiu don't share the relevant code..
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