https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68695
--- Comment #18 from Dominik Vogt <vogt at linux dot vnet.ibm.com> --- Defining PROMOTE_MODE is not really an option on S/390. Whether it's profitable or expensive to promote a value mostly depends on the way a value is used and the context. Experiments with using PROMOTE_MODE with the Spec20006 testsuite result in many thousands additional instructions overall (but some tests actually get smaller).