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Ryan Houdek
a3bf952f2b
This matches x86 vector shift behaviour closely for ps{rl,ra,ll}{w,d,q}
where the vector is shifted by a scalar value that is 64-bits wide.
Anything larger than the element size will set that element to zero.
With SVE we have some new wide element shifts that match this behaviour
exactly (except supports wide shift sources rather than scalar).
This is a significant improvement even on platforms that only support
128-bit SVE.