[Bug rtl-optimization/79405] [7 Regression] Compile-time hog w/ -O2 (-Os, -O3) on 32-bit BE powerpc targets

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79405

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
(gdb) l
1476         end, and we'll go through them as well.
1477
1478         Do not forward propagate addresses into loops until after
unrolling.
1479         CSE did so because it was able to fix its own mess, but we are
not.  */
1480
1481      for (i = 0; i < DF_USES_TABLE_SIZE (); i++)
1482        {
1483          df_ref use = DF_USES_GET (i);
1484          if (use)
1485            if (DF_REF_TYPE (use) == DF_REF_REG_USE
(gdb) p i
$8 = 53321

so it looks like sth corrupts uses (dumping the function at this point only
shows 80 insns).