https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88854

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 5 doesn't see the CSE opportunity because it doesn't process the unused
load and the translation code is not up-to-speed.  Then DOM figures out the
redundant store it sees them adjacent.

So I wouldn't really call this a regression.

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