rsq - Reciprocal square root

rsq     dest, src{ .x | .y | .z | .w }

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

Only one component must be specified for src.

Calculates the inverse square root.

If the result of the operation is positive or negative infinity, NaN may be output.
Use the cmp instruction if you need to distinguish between NaN and positive or negative infinity.

tmp = src { .x | .y | .z | .w }
dest.x = 1 / sqrt ( tmp )
dest.y = 1 / sqrt ( tmp )
dest.z = 1 / sqrt ( tmp )
dest.w = 1 / sqrt ( tmp )

rsq     r0,     c1.x

	1	2	3	4	5
rsq	read	RCP / RSQ		post	write

2011/12/20

Initial version.