_FP_SQRT
#define FP_SQRT_D(R,X) _FP_SQRT(D,2,R,X)
#define FP_SQRT_D(R,X) _FP_SQRT(D,1,R,X)
#define FP_SQRT_Q(R,X) _FP_SQRT(Q,4,R,X)
#define FP_SQRT_Q(R,X) _FP_SQRT(Q,2,R,X)
#define FP_SQRT_S(R,X) _FP_SQRT(S,1,R,X)