[Libre-soc-bugs] [Bug 671] convert spec pseudocode to use XLEN width

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=671

--- Comment #14 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #13)
> usually unary minus is handled as a separate operator...
> 
> See JavaScript's syntax as an example:
> https://262.ecma-international.org/#sec-unary-operators
> 
> I can help out with this bug tomorrow, busy today.

ohh, a separate item in the BNF?

so, atom would be:

expr |
number |
negnumber |
...

or.. oh wait, no i got it.  like:

unary =
    ~x
  | !x

etc, you would also have:

    -x

in that list.

ok yeah, then that would also work for "EXPR - - NUMBER"

it also i think solves the case of not matching against EXPR NUMBER

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