Re: [PATCH 20/55] target/arm: Implement MVE VDUP

[Richard Henderson]

On 6/9/21 3:06 AM, Peter Maydell wrote:
> Mmm. I think some of this structure is holdover from an initial
> misinterpretation
> of the spec that all these ops looked at the predicate bit for the LS byte
> of the element to see if the entire element was acted upon, in which case
> you do need to work element-by-element with the right size. (This is actually
> true for some operations, but mostly the predicate bits do bytewise masking
> and can give you a partial chunk of a result element, as here.)

Even if the operation did look at specific predicate bits, that simply puts it 
in line with SVE, which is quite happy with expand_pred_[bhsd].


r~