[Bug tree-optimization/57303] [4.7/4.8/4.9 Regression] struct miscompiled at -O1 and above

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57303

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
statement_sink_location in

          /* A killing definition is not a use.  */
          if (gimple_assign_single_p (use_stmt)
              && gimple_vdef (use_stmt)
              && operand_equal_p (gimple_assign_lhs (stmt),
                                  gimple_assign_lhs (use_stmt), 0)) 
            continue;

doesn't check:

(gdb) call debug_gimple_stmt (use_stmt)
# .MEM_11 = VDEF <.MEM_10>
y.f0 = y.f0;