Optimize vector length calculations (#11549)

builtin/common/misc_helpers.lua

@@ -209,14 +209,7 @@ end
 
 --------------------------------------------------------------------------------
 function math.hypot(x, y)
-	local t
-	x = math.abs(x)
-	y = math.abs(y)
-	t = math.min(x, y)
-	x = math.max(x, y)
-	if x == 0 then return 0 end
-	t = t / x
-	return x * math.sqrt(1 + t * t)
+	return math.sqrt(x * x + y * y)
 end
 
 --------------------------------------------------------------------------------

builtin/common/vector.lua

@@ -67,7 +67,7 @@ metatable.__eq = vector.equals
 -- unary operations
 
 function vector.length(v)
-	return math.hypot(v.x, math.hypot(v.y, v.z))
+	return math.sqrt(v.x * v.x + v.y * v.y + v.z * v.z)
 end
 -- Note: we can not use __len because it is already used for primitive table length
 
@@ -104,7 +104,7 @@ function vector.distance(a, b)
 	local x = a.x - b.x
 	local y = a.y - b.y
 	local z = a.z - b.z
-	return math.hypot(x, math.hypot(y, z))
+	return math.sqrt(x * x + y * y + z * z)
 end
 
 function vector.direction(pos1, pos2)