A.5.157 MOVAPD: Move Aligned Packed Double-Precision FP Values
MOVAPD xmm1,xmm2/mem128 ; 66 0F 28 /r [WILLAMETTE,SSE2]
MOVAPD xmm1/mem128,xmm2 ; 66 0F 29 /r [WILLAMETTE,SSE2]
MOVAPD moves a double quadword containing 2 packed double-precision FP
values from the source operand to the destination. When the source or
destination operand is a memory location, it must be aligned on a 16-
byte boundary.
To move data in and out of memory locations that are not known to be on
16-byte boundaries, use the MOVUPD instruction (section A.5.182).