[Libre-soc-isa] [Bug 968] document shift-and-add instruction

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=968

--- Comment #16 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #14)

> @@ -122,17 +124,21 @@ shadd r4, r1, r2, 3
>  Pseudocode:
>  
>      shift <- sm + 1                                    # Shift is between
> 1-4
> -    n <- (RB)[XLEN/2:XLEN-1]               # Limit RB to upper word
> (32-bits)
> +    n <- (RB)[32:63]                           # Only use lower 32-bits of
> RB
>      sum[0:63] <- (n << shift) + (RA)    # Shift n, add RA
>      RT <- sum                                      # Result stored in RT

no, sorry, sorry, you're right: that's ls004.mdwn, not
openpower-isa bitmanip.mdwn.

distracted, hard to pay attention from an apartment.

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