https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68273
--- Comment #18 from Jeffrey A. Law <law at redhat dot com> --- Richi, The patch fixes both the original testcase as well as the reduced testcase. The difficultly I see is building a reliable test for the regression suite. Parsing RTL dumps looking for the right assignments to the argument registers is, umm, painful.