A.5.7 ADDSS: ADD Scalar Single-Precision FP Values
ADDSS xmm1,xmm2/mem32 ; F3 0F 58 /r [WILLAMETTE,SSE2]
ADDSS adds the low single-precision FP values from the source and
destination operands and stores the single-precision FP result in the
destination operand.
dst[0-31] := dst[0-31] + src[0-31],
dst[32-127] remains unchanged.
The destination is an XMM register. The source operand can be either an
XMM register or a 32-bit memory location.