[Bug target/77613] Powerpc64le: redundant swaps in autovectorised loop

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77613

--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
This is simple enough.  We have code to allow splats in pure-SIMD ranges, but
we are missing a pattern that performs a splat and a truncate in the same
operation.  Should have a patch to submit today.