[Bug middle-end/70980] New: ICE pre_and_rev_post_order_compute, at cfganal.c:1056

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70980

            Bug ID: 70980
           Summary: ICE pre_and_rev_post_order_compute, at cfganal.c:1056
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
  Target Milestone: ---
              Host: i386-pc-solaris2.1[012], x86_64-pc-linux-gnu
            Target: i386-pc-solaris2.1[012], x86_64-pc-linux-gnu
             Build: i386-pc-solaris2.1[012], x86_64-pc-linux-gnu

Between 20160504 and 20160505, g++.dg/pr62079.C began to FAIL on Linux/x86_64
and Solaris/x86, only for 64-bit:

FAIL: g++.dg/pr62079.C   (internal compiler error)
FAIL: g++.dg/pr62079.C   (test for excess errors)

Excess errors:
/vol/gcc/src/hg/trunk/local/gcc/testsuite/g++.dg/pr62079.C:78:1: internal
compiler error: in pre_and_rev_post_order_compute, at cfganal.c:1056
0x8b6760e pre_and_rev_post_order_compute(int*, int*, bool)
        /vol/gcc/src/hg/trunk/local/gcc/cfganal.c:1055
0x8b35001 init_alias_analysis()
        /vol/gcc/src/hg/trunk/local/gcc/alias.c:3252
0x96134df sched_init()
        /vol/gcc/src/hg/trunk/local/gcc/haifa-sched.c:7369
0x9614b75 haifa_sched_init()
        /vol/gcc/src/hg/trunk/local/gcc/haifa-sched.c:7406
0x8f02a1e schedule_insns()
        /vol/gcc/src/hg/trunk/local/gcc/sched-rgn.c:3504
0x8f0323b schedule_insns()
        /vol/gcc/src/hg/trunk/local/gcc/sched-rgn.c:3498
0x8f0323b rest_of_handle_sched2
        /vol/gcc/src/hg/trunk/local/gcc/sched-rgn.c:3737
0x8f0323b execute
        /vol/gcc/src/hg/trunk/local/gcc/sched-rgn.c:3873

  Rainer