http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58009
Tobias Burnus <burnus at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |burnus at gcc dot gnu.org --- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> --- (In reply to Thomas Koenig from comment #3) > a([i,j,i]) = ... > for which I cannot think of an algorithm which is O(n), > so I guess it will have to be O(n**2). Given that most code has either no or only very few vector subscripts, it shouldn't matter too much. Additionally, I expect that one either has only very few elements - or one uses A([array]) which is not compile-time checkable. The only case where one might have a lot of elements in the vector is in generated code - but that looks as a very, very special case for which one does not need to performance optimize, I'd guess. Side note: I tried your example with NAG f95 5.1 (of 2007) - and it does not detect the issue - neither at compile nor at runtime (-C=all).