[Bug tree-optimization/70390] New: [6 Regression] internal compiler error: in copy_loop_close_phi_args, at graphite-isl-ast-to-gimple.c:2114

["ktkachov at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70390

            Bug ID: 70390
           Summary: [6 Regression] internal compiler error: in
                    copy_loop_close_phi_args, at
                    graphite-isl-ast-to-gimple.c:2114
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64

The testcase:

int a, c;
int *b;
short d, f;
static int e;
long g;
void
fn1 ()
{
  a = 4;
  for (; a >= 0; a--)
    ;
  for (; c;)
    for (; f <= 4; f++)
      {
        g &= a;
        d = 0;
        for (; d <= 4; d++)
          e |= b[d];
      }
}

ICEs for me on aarch64 with -O3 -floop-interchange (-O2 doesn't crash)

mycrash.c: In function 'fn1':
mycrash.c:7:1: internal compiler error: in copy_loop_close_phi_args, at
graphite-isl-ast-to-gimple.c:2114
 fn1 ()
 ^~~
0x108da77
translate_isl_ast_to_gimple::copy_loop_close_phi_args(basic_block_def*,
basic_block_def*, bool)
        $SRC/gcc/graphite-isl-ast-to-gimple.c:2114
0x108def3
translate_isl_ast_to_gimple::copy_loop_close_phi_nodes(basic_block_def*,
basic_block_def*)
        $SRC/gcc/graphite-isl-ast-to-gimple.c:2183
0x108ead5
translate_isl_ast_to_gimple::copy_bb_and_scalar_dependences(basic_block_def*,
edge_def*, vec<tree_node*, va_heap, vl_ptr>)
        $SRC/gcc/graphite-isl-ast-to-gimple.c:2715
0x108f608
translate_isl_ast_to_gimple::translate_isl_ast_node_user(isl_ast_node*,
edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
        $SRC/gcc/graphite-isl-ast-to-gimple.c:935
0x108f78f translate_isl_ast_to_gimple::translate_isl_ast(loop*, isl_ast_node*,
edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
        $SRC/gcc/graphite-isl-ast-to-gimple.c:1039
0x108fce0 translate_isl_ast_to_gimple::translate_isl_ast_node_block(loop*,
isl_ast_node*, edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
        $SRC/gcc/graphite-isl-ast-to-gimple.c:964
0x108f7a5 translate_isl_ast_to_gimple::translate_isl_ast(loop*, isl_ast_node*,
edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
        $SRC/gcc/graphite-isl-ast-to-gimple.c:1043
0x10902cc graphite_regenerate_ast_isl(scop*)
        $SRC/gcc/graphite-isl-ast-to-gimple.c:3185
0x1086f15 graphite_transform_loops()
        $SRC/gcc/graphite.c:329
0x10870ac graphite_transforms
        $SRC/gcc/graphite.c:356
0x10870ac execute
        $SRC/gcc/graphite.c:433
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