pg_hypot(double x, double y)
{
	double		yx;

	/* Handle INF and NaN properly */
	if (isinf(x) || isinf(y))
		return get_float8_infinity();

	if (isnan(x) || isnan(y))
		return get_float8_nan();

	/* Else, drop any minus signs */
	x = fabs(x);
	y = fabs(y);

	/* Swap x and y if needed to make x the larger one */
	if (x < y)
	{
		double		temp = x;

		x = y;
		y = temp;
	}

	/*
	 * If y is zero, the hypotenuse is x.  This test saves a few cycles in
	 * such cases, but more importantly it also protects against
	 * divide-by-zero errors, since now x >= y.
	 */
	if (y == 0.0)
		return x;

	/* Determine the hypotenuse */
	yx = y / x;
	return x * sqrt(1.0 + (yx * yx));
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.