https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106187
--- Comment #29 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Thanks for having a look, yes, I was at a loss to understand how that change
(which is before the problematic hunk would be the cause of the problem. It
looks like we can rule that change out as a real fix.
> The code at RTL expansion time looks reasonable (also from an aliasing POV),
> if -fno-strict-aliasing fixes it, does -fno-schedule-insn{,2} also?
Yes, disabling scheduling also solves the issue.
