re PR c/69973 (ICE on excessive attribute vector_size)

	PR c/69973
	* targhooks.c (default_vector_alignment): Limit to MAX_OFILE_ALIGNMENT.

	PR c/69973
	* gcc.dg/pr69973.c: New test.

From-SVN: r234002

gcc/ChangeLog

 2016-03-04  Bernd Schmidt  <bschmidt@redhat.com>
 
+	PR c/69973
+	* targhooks.c (default_vector_alignment): Limit to MAX_OFILE_ALIGNMENT.
+
 	PR rtl-optimization/69941
 	* postreload.c (reload_combine_recognize_pattern): Ensure all uses of
 	the reg share its mode.

gcc/targhooks.c

@@ -1031,7 +1031,10 @@ tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
 HOST_WIDE_INT
 default_vector_alignment (const_tree type)
 {
-  return tree_to_shwi (TYPE_SIZE (type));
+  HOST_WIDE_INT align = tree_to_shwi (TYPE_SIZE (type));
+  if (align > MAX_OFILE_ALIGNMENT)
+    align = MAX_OFILE_ALIGNMENT;
+  return align;
 }
 
 bool

gcc/testsuite/ChangeLog

 2016-03-04  Bernd Schmidt  <bschmidt@redhat.com>
 
+	PR c/69973
+	* gcc.dg/pr69973.c: New test.
+
 	PR rtl-optimization/69941
 	* gcc.dg/torture/pr69941.c: New test.
 

gcc/testsuite/gcc.dg/pr69973.c

+/* { dg-do compile } */
+typedef int v4si __attribute__ ((vector_size (1 << 29)));