dp3 - Three component dot product

dp3     dest, src0, src1

Name	Registers
dest	An output register or temporary register.
src0	A temporary register, input register, or floating-point constant register.
src1	A temporary register, input register, or floating-point constant register.

You cannot specify a floating-point constant register for both src0 and src1.
You cannot specify input registers using different indices for src0 and src1 at the same time.

Stores the dot product of the three components of src0 and src1 in dest.

dot = ( src0.x * src1.x ) + ( src0.y * src1.y ) + ( src0.z * src1.z )
dest.x = dot
dest.y = dot
dest.z = dot
dest.w = dot

dp3     r0, c1,     v2
dp3     o0, r7.yzw, c4.xxy

	1	2	3	4	5	6
dp3	read	MUL	ADD	ADD	post	write

2011/12/20

Initial version.