Richard Henderson wrote:
> If you're going to add moves r->w, why not also go ahead and add w->r.
> There are also HImode fmov zero-extensions, fwiw.
Well in principle it would be possible to support all 8/16/32-bit zero
extensions
for all combinations of int and fp registers. However I prefer to only add cases
which are proven to be useful in real code, so it would need an example where
it helps.
We've seen too many instances where not keeping a well defined boundary
between int and fp/simd leads to bad code, so not defining all possible legal
combinations is intended. I'll check whether 32-bit w->r and w->w zero-extension
could ever trigger.
Wilco
