In http://gcc.gnu.org/ml/gcc/2007-03/msg00128.html, you wrote:
> One case is about multiple increments, the tree optimizer merges them and
> increments the register only once, so if one only looks at the size of the
> pointer value one misses them, e.g. something like this:
>
>       (set (mem (reg)) (x))
>       (set (mem (plus (reg) (const_int 4))) (x))
>       (set (reg) (plus (reg) (const_int 8))

The patches attached to PR20211 handle this case.

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