Re: New Vax - future directions :-)

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

On 2021-07-06 00:29, Jason Thorpe wrote:
> > On Jul 5, 2021, at 3:17 PM, Johnny Billquist <bqt%update.uu.se@localhost> wrote:
> >
> > On 2021-07-05 23:03, Jason Thorpe wrote:
> > > > On Jul 5, 2021, at 12:18 PM, Mouse <mouse%Rodents-Montreal.ORG@localhost> wrote:
> > > >
> > > >
> > > > It clears R0 and R1.  On VAX-32, that is.  It remains to be determined
> > > > what it would do on VAX-64 (in 64-bit mode, if the hardware is to be
> > > > dual-mode).  Personally, I would say it should clear just R0 (but all
> > > > 64 bits of it).
> > > IMO, CLRQ should be disallowed in 32-bit mode.
> >
> > I think you are about 45 years late for that one. :-D
>
> Ok, let me re-state… “for any Q insn that does not already exist, trying to use it in 32-bit mode should cause an illegal insn fault”.
>
> The idea that an operation that takes a single register as an argument would operate on two is, frankly, stupid.

Fair enough. But CLRQ already exists. So it's too late for that one.
Same with MOVQ

But I think those are the only ones defined that I can think of.

  Johnny

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Johnny Billquist                  || "I'm on a bus
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