[Bug debug/90194] ICE in expand_debug_expr, at cfgexpand.c:5244

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90194

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-04-24
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  update-address-taken does, after CCP:

 af (int xn)
 {
   void * D.2359;
-  void * _2;

   <bb 2> [local count: 1073741824]:
   # DEBUG BEGIN_STMT
   # DEBUG D.2357 => 4
   # DEBUG nq => &xn
   # DEBUG BEGIN_STMT
-  _4 = &xn;
   # DEBUG D.2357 => NULL
   # DEBUG nq => NULL
-  _2 = _4;
-  MEM[(struct cb *)_2] = {};
+  xn_5 = VIEW_CONVERT_EXPR<int>({});
+  # DEBUG xn => xn_5
   return;

which failed to "fold" the V_C_E.  It does reach

                      rhs = fold_build1 (VIEW_CONVERT_EXPR,
                                         TREE_TYPE (lhs), rhs);

but this does nothing.