[Bug tree-optimization/87981] New: ICE: Segmentation fault (in add_phi_arg)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87981

            Bug ID: 87981
           Summary: ICE: Segmentation fault (in add_phi_arg)
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

gcc-9.0.0-alpha20181111 snapshot (r266019), 8.2, 7.3 all ICE when compiling
gcc/testsuite/gcc.dg/vect/vect-cond-arith-2.c w/ -fexceptions -fgimple:

% gcc-9.0.0-alpha20181111 -fexceptions -fgimple -c
gcc/testsuite/gcc.dg/vect/vect-cond-arith-2.c
during GIMPLE pass: cfg
gcc/testsuite/gcc.dg/vect/vect-cond-arith-2.c: In function 'neg_xi':
gcc/testsuite/gcc.dg/vect/vect-cond-arith-2.c:5:1: internal compiler error:
Segmentation fault
    5 | neg_xi (double *x)
      | ^~~~~~
0xce6f8f crash_signal
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181111/work/gcc-9-20181111/gcc/toplev.c:325
0xd9c678 add_phi_arg(gphi*, tree_node*, edge_def*, unsigned int)
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181111/work/gcc-9-20181111/gcc/tree-phinodes.c:358
0xd304b4 lower_phi_internal_fn
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181111/work/gcc-9-20181111/gcc/tree-cfg.c:394
0xd304b4 build_gimple_cfg
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181111/work/gcc-9-20181111/gcc/tree-cfg.c:249
0xd304b4 execute_build_cfg
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181111/work/gcc-9-20181111/gcc/tree-cfg.c:408
0xd304b4 execute
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181111/work/gcc-9-20181111/gcc/tree-cfg.c:444

I'm not marking it a regression because feeding GIMPLE to the driver was
implemented during the gcc 7 development cycle.