[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 #50 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to dmitry.selyutin from comment #49)
> (In reply to Luke Kenneth Casson Leighton from comment #40)
> > but, actually, i think even that would work.
> 
> This seems to do the trick:
> 
>    do i = 0 to 1
>        n <-  0
>        do j = 0 to ((XLEN/2)-1)
>           if (RS)[(i*(XLEN/2))+j] = 1 then
>               n <- n+1
>        RA[(i*(XLEN/2)):(i*(XLEN/2))+((XLEN/2)-1)] <- n
> 
> ...the last line looks particularly impressive.

much joy. let's write a spec that wins an obfuscation contest,
double bonus points.

much as i am tempted by that possibility,
can i suggest, a temp var or two:

    e = XLEN/2-1
    do i = 0 to 1
        s = i*XLEN/2
        n <- 0
        do j = 0 to e
           if (RS)[s+j] = 1 then
               n <- n+1
        RA[s:s+e] <- n

or other mercifully short temp var names

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