A.5.297 SQRTPD: Packed Double-Precision FP Square Root
SQRTPD xmm1,xmm2/m128 ; 66 0F 51 /r [WILLAMETTE,SSE2]
SQRTPD calculates the square root of the packed double-precision FP
value from the source operand, and stores the double-precision results
in the destination register.