Set packed double-precision (64-bit) floating-point elements in "dst" with the repeated 4 element sequence in reverse order.
Operation
dst[63:0] := d
dst[127:64] := c
dst[191:128] := b
dst[255:192] := a
dst[319:256] := d
dst[383:320] := c
dst[447:384] := b
dst[511:448] := a
dst[MAX:512] := 0