> On Aug 2, 2018, at 4:25 PM, Bob Eager <r...@tavi.co.uk> wrote:
>
> On Thu, 2 Aug 2018 22:00:05 +0200
> Rhialto <rhia...@falu.nl> wrote:
>
> > Most overviews of the instruction set do not even explain what it
> > does. I only found it in the older ones, such as in the PDP 11-40
> > Processor Handbook (page 4-61, pdf page 107).
>
> I remember considering using it when writing a compiler for the 11. In
> the end I decided it was more trouble than it was worth.
I came to the same conclusion when I was looking at it the other day, while
working on the gcc back-end for pdp11.
paul
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