Cannot sample enough valid points. (more)

\[x \cdot \sqrt{y \cdot y - z \cdot z}\]
x \cdot \sqrt{y \cdot y - z \cdot z}
double f(double x, double y, double z) {
        double r664216 = x;
        double r664217 = y;
        double r664218 = r664217 * r664217;
        double r664219 = z;
        double r664220 = r664219 * r664219;
        double r664221 = r664218 - r664220;
        double r664222 = sqrt(r664221);
        double r664223 = r664216 * r664222;
        return r664223;
}