https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115825

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |15.0
            Summary|[12/13/14/15 Regression]    |[12/13/14 Regression] Loop
                   |Loop unrolling increases    |unrolling increases code
                   |code size with -Os          |size with -Os

--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk, I'm unlikely going to backport this though as with all
heuristics this is going to cause some regressions (none important though,
hopefully).  There's a workaround by adding #pragma GCC unroll 0 to loops
where this hurts most.

Going to keep it open for tracking/duping anyway.

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