https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61578
--- Comment #25 from Fredrik Hederstierna <fredrik.hederstie...@securitas-direct.com> --- I've but this last example in a separate issue: Bug 67507 - Code size increase with -Os from GCC 4.8.x to GCC 4.9.x for ARM thumb1. I've also previously put this one that causes size increase Bug 67213 - When compiling for size with -Os loops can get bigger after peeling. Best Regards, Fredrik