https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947 Bug 53947 depends on bug 56902, which changed state.
Bug 56902 Summary: Fails to SLP with mismatched +/- and negatable constants https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56902 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED