[Bug target/96787] New: rs6000 mcpu=power10 miscompiles libiberty htab_delete() causing bootstrap failure

[acsawdey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96787

            Bug ID: 96787
           Summary: rs6000 mcpu=power10 miscompiles libiberty
                    htab_delete() causing bootstrap failure
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acsawdey at gcc dot gnu.org
  Target Milestone: ---

Created attachment 49122
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49122&action=edit
hashtab.c with no added attributes

Building r11-2827 configured using --with-cpu=power10, I am seeing some kind of
compile failure in libiberty hashtab.o function htab_delete(). Putting
__attribute__ ((target("cpu=power9")) in front of that function clears the
problem.

The manifestation is that genmddeps segfaults.

I've attached asm output with (.fixed.s) and without (.broken.s) the attribute
on htab_delete().