https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121764

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note there is no testcase testing the extended constant_pointer_difference
usage directly. `gcc.dg/torture/pr45636.c` does show the difference if you look
into the forwprop dump.

If I get some time I will add a testcase that shows the missing optimization in
that case.

This is also mentioned in
https://gcc.gnu.org/pipermail/gcc-patches/2010-October/296366.html .

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