https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65932
Jim Wilson <wilson at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |wilson at gcc dot gnu.org --- Comment #11 from Jim Wilson <wilson at gcc dot gnu.org> --- There is another testcase in 66271. The LSR is emitted because the arm port has PROMOTE_MODE defined to make chars and shorts unsigned when extended to int. So the problem seems to be why it wasn't re-sign-extended before the compare. Maybe an optimization pass incorrectly deleted that sign-extend.