[Bug rtl-optimization/81308] New: [8 regression] ICE in calc_dfs_tree, at dominance.c:458

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81308

            Bug ID: 81308
           Summary: [8 regression] ICE in calc_dfs_tree, at
                    dominance.c:458
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
  Target Milestone: ---
            Target: i386-pc-solaris2.12, i586-unknown-freebsd10.3

Between 20170702 (r249882) and 20170703 (r249926) the g++.dg/pr62079.C testcase
started to FAIL on i386-pc-solaris2.12 (32-bit only) and according to
gcc-testresults
on i586-unknown-freebsd10.3:

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

Excess errors:
during RTL pass: split2
/vol/gcc/src/hg/trunk/local/gcc/testsuite/g++.dg/pr62079.C:78:1: internal
compiler error: in calc_dfs_tree, at dominance.c:458
0x8d51fc6 calc_dfs_tree
        /vol/gcc/src/hg/trunk/local/gcc/dominance.c:458
0x8d50acb calculate_dominance_info(cdi_direction)
        /vol/gcc/src/hg/trunk/local/gcc/dominance.c:734
0x8ce81db find_partition_fixes
        /vol/gcc/src/hg/trunk/local/gcc/cfgrtl.c:2312
0x8ceb4a7 rtl_verify_edges
        /vol/gcc/src/hg/trunk/local/gcc/cfgrtl.c:2605
0x8ceb4a7 rtl_verify_flow_info_1
        /vol/gcc/src/hg/trunk/local/gcc/cfgrtl.c:2756
0x8cebbbd rtl_verify_flow_info
        /vol/gcc/src/hg/trunk/local/gcc/cfgrtl.c:2996
0x8cd795f verify_flow_info()
        /vol/gcc/src/hg/trunk/local/gcc/cfghooks.c:257
0x909f77c checking_verify_flow_info
        /vol/gcc/src/hg/trunk/local/gcc/cfghooks.h:198
0x909f77c split_all_insns()
        /vol/gcc/src/hg/trunk/local/gcc/recog.c:2992
0x909f79a execute
        /vol/gcc/src/hg/trunk/local/gcc/recog.c:3890

  Rainer