In the competing array indexing syntax *(a+b) there is the same evaluation order issue, and they should have the same behaviour: is a evaluated before b or

In the competing array indexing syntax *(a+b) there is the same evaluation order issue, and they should have the same behaviour: is a evaluated before b or the compiler is allowed to choose an order? Clearly it depends on the rules for a+b which are more important than the special case of array indexing.