Re: Moving VAX into 21 century :-)

[Johnny Billquist <bqt%update.uu.se@localhost>]

On 2019-09-01 06:01, Mouse wrote:
> > > > I can't remember.  Does CALL really align the stack?
> > > Yes, and yes.  The alignment (2 bits) is part of the generated stack
> > > frame.
> > And, sorry for asking instead of trying to read the documentation,
> > this alignment is not done in general for the stack?
>
> Right; it is not.  The VAX is about as misalignment-tolerating as
> architectures get; there are extremely few pieces of it where anything
> needs any alignment at all.  You can `align' your stack to an odd
> address and, in general, all that will happen is you'll pay a bit of a
> speed penalty on some implementations.

Yes, which is why I was a bit surprised that it did do alignment in the 
CALLx instructions. But so it did.

  Johnny

--
Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt%softjar.se@localhost             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol