[Bug lto/63166] New: [5 Regression] ICE (LTO): ipa_intraprocedural_devirtualization, at ipa-prop.c:2611

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63166

            Bug ID: 63166
           Summary: [5 Regression] ICE (LTO):
                    ipa_intraprocedural_devirtualization, at
                    ipa-prop.c:2611
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org

Created attachment 33447
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33447&action=edit
Test file "one2.ii"

For the big program, it is surely a regression and the code is (should be)
valid. I am less sure about the reduced test case.

Reproduce:
$ g++ -flto -w -O2 -c one2.ii two.ii

$ .../libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto1 -quiet -o /dev/null
one2.o two.o -O2

two.ii: In function ‘validate’:
two.ii:85:1: internal compiler error: in ipa_intraprocedural_devirtualization,
at ipa-prop.c:2611
 validate ()
 ^
0x82ba7d ipa_intraprocedural_devirtualization(gimple_statement_base*)
        ../../gcc/ipa-prop.c:2611
0xb0b28b eliminate_dom_walker::before_dom_children(basic_block_def*)
        ../../gcc/tree-ssa-pre.c:4323
0xecdc47 dom_walker::walk(basic_block_def*)
        ../../gcc/domwalk.c:177