Sticky bit apparently used correctly. Testing on 20 random pairs. No failures found in 20 integer pairs. X for 20 Integers X. Test for sqrt monotonicity. Testing whether sqrt is rounded or chopped.
Square root appears to be correctly rounded.
Seeking Underflow thresholds UfThold and E0. Accuracy seems adequate. This can interupt your program. You can skip this part if you wish. Rounding appears to conform to the proposed IEEE standard P754.