Ok, so make the question one of `call sqrt` vs `sqrtss xmm0` + a test that sets errno in case of negative then? Or even simpler: do you demand that `x = sqrt(4

Ok, so make the question one of `call sqrt` vs `sqrtss xmm0` + a test that sets errno in case of negative then? Or even simpler: do you demand that `x = sqrt(4)` entails emitting code that calls `sqrt`?