Available on x86-64 and target feature 
sse2 only.Expand description
The resulting __m128d element is composed by the high-order values of
the two __m128d interleaved input elements, i.e.:
- The [127:64]bits are copied from the[63:0]bits of the second input
- The [63:0]bits are copied from the[63:0]bits of the first input