[Bug middle-end/93505] [8/9/10 Regression] wrong code or ICE with __builtin_bswap64() and rotation at -Og

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93505

--- Comment #12 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #10)
> Created attachment 47740 [details]
> gcc10-pr93505.patch
> 
> Untested combiner fix.  IMHO even when we fix expand_binop we want it
> anyway, because we don't want to invoke UB in the compiler, even on UB in
> the testcase.

This patch is approved for trunk and any wanted backports (if it passes
regression testing ;-) )