PR c++/83911 - ICE with multiversioned constructor.

	* cp-gimplify.c (cp_genericize_r): Replace versioned function with
	dispatchere here.
	* call.c (build_over_call): Not here.
	PR c++/83911 - ICE with multiversioned constructor.

From-SVN: r258592

gcc/cp/ChangeLog

+2018-03-16  Jason Merrill  <jason@redhat.com>
+
+	PR c++/83911 - ICE with multiversioned constructor.
+	* cp-gimplify.c (cp_genericize_r): Replace versioned function with
+	dispatchere here.
+	* call.c (build_over_call): Not here.
+
 2018-03-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/84874

gcc/cp/call.c

@@ -8204,23 +8204,6 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
 	}
     }
 
-  /* For calls to a multi-versioned function, overload resolution
-     returns the function with the highest target priority, that is,
-     the version that will checked for dispatching first.  If this
-     version is inlinable, a direct call to this version can be made
-     otherwise the call should go through the dispatcher.  */
-
-  if (DECL_FUNCTION_VERSIONED (fn)
-      && (current_function_decl == NULL
-	  || !targetm.target_option.can_inline_p (current_function_decl, fn)))
-    {
-      fn = get_function_version_dispatcher (fn);
-      if (fn == NULL)
-	return NULL;
-      if (!already_used)
-	mark_versions_used (fn);
-    }
-
   if (!already_used
       && !mark_used (fn, complain))
     return error_mark_node;

gcc/cp/cp-gimplify.c

@@ -1513,6 +1513,29 @@ cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
 		       == REFERENCE_TYPE))
 	    *walk_subtrees = 0;
 	}
+      /* Fall through.  */
+    case AGGR_INIT_EXPR:
+      /* For calls to a multi-versioned function, overload resolution
+	 returns the function with the highest target priority, that is,
+	 the version that will checked for dispatching first.  If this
+	 version is inlinable, a direct call to this version can be made
+	 otherwise the call should go through the dispatcher.  */
+      {
+	tree fn = cp_get_callee_fndecl (stmt);
+	if (fn && DECL_FUNCTION_VERSIONED (fn)
+	    && (current_function_decl == NULL
+		|| !targetm.target_option.can_inline_p (current_function_decl,
+							fn)))
+	  if (tree dis = get_function_version_dispatcher (fn))
+	    {
+	      mark_versions_used (dis);
+	      dis = build_address (dis);
+	      if (TREE_CODE (stmt) == CALL_EXPR)
+		CALL_EXPR_FN (stmt) = dis;
+	      else
+		AGGR_INIT_EXPR_FN (stmt) = dis;
+	    }
+      }
       break;
 
     default:

gcc/testsuite/g++.dg/ext/mv27.C

+// PR c++/83911
+// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-require-ifunc "" }
+
+class SimdFloat
+{
+public:
+    __attribute__ ((target ("default")))
+    SimdFloat(float x) {}
+
+    __attribute__ ((target ("avx2")))
+    SimdFloat(float x) {}
+};
+
+SimdFloat foo()
+{
+    return 1;
+}