as far as i can tell this is more or less how you're supposed to do signed math in verilog. (i could make i_imm8 signed, and i could replace $signed(1) with a 1'bs1, but neither is much of improvement)
thanks i hate itpic.twitter.com/mKRwGeXrih
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I am already very angry, so please explain while I fix the specification to be, uh, very marginally less ugly
So the {...} is just the regular concatenation operator, but with only one argument, so the isn't much to concatenate in fact. But the arguments to that operator are self-signed and self-sized, so the stuff outside {..} doesn't influence the signedness or size of the argument.
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Instead of {..} you could also write $unsigned(..), or even
$signed(..) in this case. But {..} is more convenient to type imo. -
reminds me of how in Rust, the identity function (which can also be written {}!) lets you explicitly move values (the same as std::move in C++11)...
End of conversation
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