https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19987 Bug 19987 depends on bug 96226, which changed state.
Bug 96226 Summary: Failure to optimize shift+not to rotate https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96226 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED