[PATCH v2] arm: Fix bugs with MVE vmov from two GPRs to vector lanes

[Alex Coplan]

On 17/05/2021 14:40, Richard Earnshaw wrote:
> 
> 
> On 17/05/2021 13:03, Alex Coplan via Binutils wrote:
> > Hi all,
> > 
> > This is a v2 of my previous patch:
> > https://sourceware.org/pipermail/binutils/2021-May/116594.html
> > 
> > This version uses a sensible sampling of the encoding space for the
> > instruction in the test instead of testing every possible instance of
> > the instruction.
> > 
> > There is no code change wrt. the v1.
> > 
> > Regtested on arm-eabi, no regressions.
> > 
> > OK for trunk? What about backports?
> > 
> > Thanks,
> > Alex
> > 
> 
> OK for trunk.

Thanks, pushed as e683cb412046b40085505f42dd141f542661a6ae.

> 
> Which branches are affected?  What's the impact on users in practice? eg,
> does not having this fix cause gcc to fail?

Binutils branches back to 2.33 (when MVE supported was added) are
affected. This does indeed cause GCC to fail, see:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100572

I wonder if backporting prior to 2.36 would be sensible?

Alex

> 
> R.