[Bug c/71901] New: ice in find_or_generate_expression

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71901

            Bug ID: 71901
           Summary: ice in find_or_generate_expression
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 38916
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38916&action=edit
C source code

The attached source code, when compiled with -O2 on
gcc trunk dated 20160716, does this:

sturm.c: In function ‘_ratpoints_compute_sturm’:
sturm.c:73:6: internal compiler error: Segmentation fault
0xc5e61f crash_signal
        ../../src/trunk/gcc/toplev.c:335
0xe0d1c9 find_or_generate_expression
        ../../src/trunk/gcc/tree-ssa-pre.c:2691
0xe0d8a9 create_component_ref_by_pieces_1
        ../../src/trunk/gcc/tree-ssa-pre.c:2579
0xe0d750 create_component_ref_by_pieces_1
        ../../src/trunk/gcc/tree-ssa-pre.c:2544
0xe0d750 create_component_ref_by_pieces_1
        ../../src/trunk/gcc/tree-ssa-pre.c:2544