[Bug c/78121] New: ice in set_value_range

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78121

            Bug ID: 78121
           Summary: ice in set_value_range
           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 39902
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39902&action=edit
C source code

The attached code, when compiled by gcc dated 20161026, and compiler
flags -O2 -ansi, does this:

$ ../results/bin/gcc -c -ansi -O2 bug317.c 2>&1 | more
output.c: In function ‘indicate_special’:
output.c:778:1: internal compiler error: in set_value_range, at tree-vrp.c:367
0xed2af0 set_value_range
        ../../trunk/gcc/tree-vrp.c:367
0xed4b9c get_value_range
        ../../trunk/gcc/tree-vrp.c:699
0xed4e34 vrp_valueize
        ../../trunk/gcc/tree-vrp.c:7054
0x105d4bf do_valueize
        ../../trunk/gcc/gimple-match-head.c:557

I'll have a go at reducing the source code file.