re PR tree-optimization/39529 (ICE on valid code)

	PR tree-optimization/39529
	* tree-vect-transform.c (vect_create_data_ref_ptr): Call
	mark_sym_for_renaming for the tag copied to the new vector
	pointer.

From-SVN: r145029

gcc/ChangeLog

+2009-03-24  Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-optimization/39529
+	* tree-vect-transform.c (vect_create_data_ref_ptr): Call
+	mark_sym_for_renaming for the tag copied to the new vector
+	pointer.
+
 2009-03-24  Arthur Loiret  <aloiret@debian.org>
 
 	* config.host (alpha*-*-linux*): Use driver-alpha.o and

gcc/testsuite/ChangeLog

+2009-03-24  Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-optimization/39529
+	* gcc.dg/vect/pr39529.c: New test.
+
 2009-03-24  Dodji Seketeli  <dodji@redhat.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/testsuite/gcc.dg/vect/pr39529.c

+/* { dg-do compile } */
+
+void
+foo (void)
+{
+  char a[1024];
+  char *p = &a[0];
+  char *p2;
+
+  p2 = p + 1024;
+  do
+    {
+      p += 2;
+      *(p-2) = 1;
+      *(p-1) = 1;
+    } while (p < p2);
+}
+
+/* { dg-final { cleanup-tree-dump "vect" } } */
+
+

gcc/tree-vect-transform.c

@@ -1099,7 +1099,10 @@ vect_create_data_ref_ptr (gimple stmt, struct loop *at_loop,
   if (!MTAG_P (tag))
     new_type_alias (vect_ptr, tag, DR_REF (dr));
   else
-    set_symbol_mem_tag (vect_ptr, tag);
+    {
+      set_symbol_mem_tag (vect_ptr, tag);
+      mark_sym_for_renaming (tag);
+    }
 
   /** Note: If the dataref is in an inner-loop nested in LOOP, and we are
       vectorizing LOOP (i.e. outer-loop vectorization), we need to create two