https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101676
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> why is | better than ^?
Just to reply to this. The reasoning from simplify-rtx.cc:
/* If we are XORing two things that have no bits in common,
convert them into an IOR. This helps to detect rotation encoded
using those methods and possibly other simplifications. */
Which was added with r0-24478-g79e8185c9ccfcb .
