[Bug middle-end/112572] New: [14 regression] LLVM miscompiled since r14-5355-g3cd3a09b3f91a1

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112572

            Bug ID: 112572
           Summary: [14 regression] LLVM miscompiled since
                    r14-5355-g3cd3a09b3f91a1
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org, rsandifo at gcc dot gnu.org,
                    slyfox at gcc dot gnu.org
  Target Milestone: ---

LLVM's test suite has many failures for me with trunk.

CCing jakub because he was able to run with the test failure in PR109462 and
I've got a very poor track record with being able to reduce LLVM, ditto slyfox
as he has a great track record with reducing LLVM (PR110228, PR110726,
PR110598).

This bisects to the same commit as PR112568 does (r14-5355-g3cd3a09b3f91a1).

I'll add some (large) reproduction instructions in a minute.