[Bug c/83896] New: ice in tree_to_shwi, at tree.c:6847

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83896

            Bug ID: 83896
           Summary: ice in tree_to_shwi, at tree.c:6847
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Somewhere from revision 256420 to 256556, the following C code,
with flag -O2, does this:

during GIMPLE pass: strlen
bug412-min.c: In function ‘e’:
bug412-min.c:4:1: internal compiler error: in tree_to_shwi, at tree.c:6847
 e() {
 ^
0x10f170f tree_to_shwi(tree_node const*)
        ../../trunk/gcc/tree.c:6847
0x58aafd get_string_len
        ../../trunk/gcc/tree-ssa-strlen.c:2793
0x58aafd handle_char_store
        ../../trunk/gcc/tree-ssa-strlen.c:2970


C source code is

typedef struct { char a[5] } b;
c;
b d;
e() {
  if (strlen(&c) != 4)
    memcpy(d.a, &c, sizeof(d));
}