Re: C++ PATCH for c++/51747 (list-initialization from same type)

[Marc Glisse]

On Tue, 15 Apr 2014, Jason Merrill wrote:

It's just vectors, because they're an extension; the patch I checked in covered the standard language.

Like this? (regtested on x86_64-linux-gnu)

2014-04-16  Marc Glisse  <marc.gli...@inria.fr>

gcc/cp/
        * decl.c (reshape_init_r): Handle a single element of vector type.
gcc/testsuite/
        * g++.dg/cpp0x/initlist-vect.C: New file.

--
Marc Glisse
Index: gcc/cp/decl.c
===================================================================
--- gcc/cp/decl.c       (revision 209434)
+++ gcc/cp/decl.c       (working copy)
@@ -5400,21 +5400,21 @@ reshape_init_r (tree type, reshape_iter
            maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
        }
 
       d->cur++;
       return init;
     }
 
   /* "If T is a class type and the initializer list has a single element of
      type cv U, where U is T or a class derived from T, the object is
      initialized from that element."  Even if T is an aggregate.  */
-  if (cxx_dialect >= cxx11 && CLASS_TYPE_P (type)
+  if (cxx_dialect >= cxx11 && (CLASS_TYPE_P (type) || VECTOR_TYPE_P (type))
       && first_initializer_p
       && d->end - d->cur == 1
       && reference_related_p (type, TREE_TYPE (init)))
     {
       d->cur++;
       return init;
     }
 
   /* [dcl.init.aggr]
 
Index: gcc/testsuite/g++.dg/cpp0x/initlist-vect.C
===================================================================
--- gcc/testsuite/g++.dg/cpp0x/initlist-vect.C  (revision 0)
+++ gcc/testsuite/g++.dg/cpp0x/initlist-vect.C  (working copy)
@@ -0,0 +1,6 @@
+// { dg-do compile { target c++11 } }
+
+typedef float X __attribute__ ((vector_size (4 * sizeof (float))));
+
+X x;
+X x2{x};