s390x/tcg: Implement VECTOR MERGE (HIGH|LOW)
We cannot use gvec expansion as source and destination elements are have different element numbers. So we'll expand using a fancy loop. Also, we have to take care of overlapping source and destination registers, therefore use a safe evaluation irder depending on the operation. Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Signed-off-by: NDavid Hildenbrand <david@redhat.com> Message-Id: <20190307121539.12842-19-david@redhat.com> Signed-off-by: NCornelia Huck <cohuck@redhat.com>
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