[Bug c/59006] internal compiler error: in vect_transform_stmt, at tree-vect-stmts.c:5963

[regehr at cs dot utah.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59006

--- Comment #1 from John Regehr <regehr at cs dot utah.edu> ---
Simpler test case:

$ cat small.c
int a[10], b;
int main() {
  for (; b <= 0; b++)
    a[b] = a[0] || b;
}

$ gcc -O3 small.c
small.c: In function ‘main’:
small.c:2:5: internal compiler error: in vect_transform_stmt, at
tree-vect-stmts.c:5963
 int main() {
     ^
0xb333d7 vect_transform_stmt(gimple_statement_d*, gimple_stmt_iterator_d*,
bool*, _slp_tree*, _slp_instance*)
    /home/regehr/z/compiler-source/gcc/gcc/tree-vect-stmts.c:5963
0xb363d1 vect_transform_loop(_loop_vec_info*)
    /home/regehr/z/compiler-source/gcc/gcc/tree-vect-loop.c:5882
0xb5352f vectorize_loops()
    /home/regehr/z/compiler-source/gcc/gcc/tree-vectorizer.c:373
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.