- fp2+ x2 x1 y2 #!optional y1procedure
- fp2- x2 x1 y2 #!optional y1procedure
- fp2* x2 x1 y2 #!optional y1procedure
- fp2/ x2 x1 y2 #!optional y1procedure
- fp2abs x2 #!optional x1procedure
- fp2sqr x2 #!optional x1procedure
- fp2sqrt x2 #!optional x1procedure
- x2
- flonum
- x1
- flonum
- y2
- flonum
- y1
- flonum
Arithmetic and square root for double-double flonums. For arithmetic, error is less than 8 ulps. (See fp2ulp.) For fp2sqr and fp2sqrt, error is less than 1 ulp, and fp2abs is exact.