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[Bug target/69053] New: [6 Regression] ICE in build_vector_from_val


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69053

            Bug ID: 69053
           Summary: [6 Regression] ICE in build_vector_from_val
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: miyuki at gcc dot gnu.org
                CC: alan.lawrence at arm dot com
  Target Milestone: ---
            Target: x86_64-*-*

Starting with r230423 the following testcase causes an ICE:

$ cat genattrtab.cc 
struct A {
  int *elem[1];
};
int a, d, e;
A *b;
int *c;
int main()
{
  int *f = 0;
  for (; e; e++)
    if (b->elem[e])
      f = c;
  if (f)
    a = d;
}

$ cc1plus -march=core-avx2 -quiet -O3 genattrtab.cc
genattrtab.cc: In function 'int main()':
genattrtab.cc:7:5: internal compiler error: in build_vector_from_val, at
tree.c:1754
 int main()
     ^~~~

0xf62595 build_vector_from_val(tree_node*, tree_node*)
        /home/miyuki/gcc/src/gcc/tree.c:1753
0xf0c94a get_initial_def_for_reduction(gimple*, tree_node*, tree_node**)
        /home/miyuki/gcc/src/gcc/tree-vect-loop.c:4120
0x5b809a vect_create_epilog_for_reduction
        /home/miyuki/gcc/src/gcc/tree-vect-loop.c:4283
0xf0e65d vectorizable_reduction(gimple*, gimple_stmt_iterator*, gimple**,
_slp_tree*)
        /home/miyuki/gcc/src/gcc/tree-vect-loop.c:6100
0xf05e30 vect_transform_stmt(gimple*, gimple_stmt_iterator*, bool*, _slp_tree*,
_slp_instance*)
        /home/miyuki/gcc/src/gcc/tree-vect-stmts.c:8048
0xf0be72 vect_transform_loop(_loop_vec_info*)
        /home/miyuki/gcc/src/gcc/tree-vect-loop.c:6793
0xf27537 vectorize_loops()
        /home/miyuki/gcc/src/gcc/tree-vectorizer.c:548
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.

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