message: ek.erf(): improve handling of very large arguments
diff: @@ -1517,9 +1517,10 @@ template <typename Value> Value erf(const Value &x) {
  0x1.1c6a194029df4p-12, -0x1.03d1306b29028p-31);
  }
  + Value xb = 1.f - exp2(c1 * xa);
  return select(
  xa < 1, x * c0,
  - copysign(select(isfinite(xa), 1.f - exp2(c1 * xa), 1.f), x));
  + copysign(select(isfinite(xb), xb, 1.f), x));
  }
  }
  