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.