optimize vector component access

Author: Tr1NgleDev

glm/detail/type_vec2.inl

@@ -106,28 +106,14 @@ namespace glm
 	GLM_FUNC_QUALIFIER GLM_CONSTEXPR T & vec<2, T, Q>::operator[](typename vec<2, T, Q>::length_type i)
 	{
 		GLM_ASSERT_LENGTH(i, this->length());
-		switch(i)
-		{
-		default:
-		case 0:
-			return x;
-		case 1:
-			return y;
-		}
+		return (&x)[i];
 	}
 
 	template<typename T, qualifier Q>
 	GLM_FUNC_QUALIFIER GLM_CONSTEXPR T const& vec<2, T, Q>::operator[](typename vec<2, T, Q>::length_type i) const
 	{
 		GLM_ASSERT_LENGTH(i, this->length());
-		switch(i)
-		{
-		default:
-		case 0:
-			return x;
-		case 1:
-			return y;
-		}
+		return (&x)[i];
 	}
 
 	// -- Unary arithmetic operators --

glm/detail/type_vec3.inl

@@ -171,32 +171,14 @@ namespace glm
 	GLM_FUNC_QUALIFIER GLM_CONSTEXPR T & vec<3, T, Q>::operator[](typename vec<3, T, Q>::length_type i)
 	{
 		GLM_ASSERT_LENGTH(i, this->length());
-		switch(i)
-		{
-		default:
-			case 0:
-		return x;
-			case 1:
-		return y;
-			case 2:
-		return z;
-		}
+		return (&x)[i];
 	}
 
 	template<typename T, qualifier Q>
 	GLM_FUNC_QUALIFIER GLM_CONSTEXPR T const& vec<3, T, Q>::operator[](typename vec<3, T, Q>::length_type i) const
 	{
 		GLM_ASSERT_LENGTH(i, this->length());
-		switch(i)
-		{
-		default:
-		case 0:
-			return x;
-		case 1:
-			return y;
-		case 2:
-			return z;
-		}
+		return (&x)[i];
 	}
 
 	// -- Unary arithmetic operators --

glm/detail/type_vec4.inl

@@ -362,36 +362,14 @@ namespace detail
 	GLM_FUNC_QUALIFIER GLM_CONSTEXPR T& vec<4, T, Q>::operator[](typename vec<4, T, Q>::length_type i)
 	{
 		GLM_ASSERT_LENGTH(i, this->length());
-		switch (i)
-		{
-		default:
-		case 0:
-			return x;
-		case 1:
-			return y;
-		case 2:
-			return z;
-		case 3:
-			return w;
-		}
+		return (&x)[i];
 	}
 
 	template<typename T, qualifier Q>
 	GLM_FUNC_QUALIFIER GLM_CONSTEXPR T const& vec<4, T, Q>::operator[](typename vec<4, T, Q>::length_type i) const
 	{
 		GLM_ASSERT_LENGTH(i, this->length());
-		switch (i)
-		{
-		default:
-		case 0:
-			return x;
-		case 1:
-			return y;
-		case 2:
-			return z;
-		case 3:
-			return w;
-		}
+		return (&x)[i];
 	}
 
 	// -- Unary arithmetic operators --