https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80155
--- Comment #17 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> --- (In reply to rguent...@suse.de from comment #16) > On Thu, 23 Mar 2017, thopre01 at gcc dot gnu.org wrote: > > > > Funnily this led back to the Cortex-M0+ reduced testcase. With the patch in > > comment #13 applied we can still see a difference in the push (one register > > pushed Vs 0). > > I can't reproduce zero pushes here I get three with/without > -fno-code-hoisting. code hoisting hoists the two loads inside > the switch before it so we have Ooops my apologize, it needs more flags indeed. -O2 -funroll-all-loops shows 2 registers pushed Vs 1 when -fno-code-hoisting is added.
