Doug S (foo.delete@this.bar.bar) on October 13, 2021 9:01 am wrote:
> Adrian (a.delete@this.acm.org) on October 13, 2021 6:22 am wrote:
> > none (none.delete@this.none.com) on October 13, 2021 6:06 am wrote:
> > > Documentation is available: https://developer.arm.com/documentation/ddi0602/2021-09/Base-Instructions
> > >
> > > Instructions for memory copy are named CPY* and those for memory set are SET*.
> >
> >
> > TLDR:
> > CPY* are memmove (copy forward or backward, as needed)
> > and CPYF* are memcpy (copy forward)
>
>
> With variants for whether reads or writes are privileged or unprivileged and temporal or
> non-temporal. There are a ton of opcodes here to cover the full matrix of possibilities.
>
> Confirmation that the expectation is all three instructions (prologue,
> main and epilogue) instructions appear in sequence.

Cwetainly is a full matrix! I don't see how they cope with the change if they go from big to little.
Any idea why ARM use T for unprivileged?