https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117932
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> --- So getting to sink heuristics, we might be disabling RTL if-conversion (cmov) detection by sinking. But disallowing sinking into (half-)diamonds doesn't change anything so the testcase does not exhibit such cases. I can't think of other good reasons to not sink into (empty) forwarders.
