https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106523
--- Comment #8 from Krister Walfridsson <kristerw at gcc dot gnu.org> --- This fixed most of the rotate issues my translation validation tool found. I assume the remaining issues are due to a different (but similar) bug, so I opened Bug 108440 for those. But the issue in Bug 108440 seems similar to the "Y equal to B case" discussed in comment #6, so I believe the comment is slightly wrong (as the rotate instruction will invoke UB when Y is equal to B).
