David Green 3f90df22f1 [ARM] MVE reverse shuffles. ...

The vectorizer can sometimes make reverse shuffles from indices that
count down. In MVE, we don't have a 128bit rev instruction, but we can
select this to a VREV64 with some lane movs to swap the two halfs.

Ideally this would use VMOVD's, but only gets as far as VMOVS's at the
moment.

Differential Revision: https://reviews.llvm.org/D69510

2021-09-20 13:48:01 +01:00

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