gimplify.c (gimplify_asm_expr): Reset the TREE_CHAIN of clobbers to NULL_TREE…

gimplify.c (gimplify_asm_expr): Reset the TREE_CHAIN of clobbers to NULL_TREE before pushing them onto the vector.

	* gimplify.c (gimplify_asm_expr): Reset the TREE_CHAIN of clobbers to
	NULL_TREE before pushing them onto the vector.  Likewise for labels.

From-SVN: r202819

gcc/ChangeLog

+2013-09-22  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gimplify.c (gimplify_asm_expr): Reset the TREE_CHAIN of clobbers to
+	NULL_TREE before pushing them onto the vector.  Likewise for labels.
+
 2013-09-21  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* config/ia64/predicates.md (ia64_cbranch_operator): Accept unordered

gcc/gimplify.c

@@ -5419,11 +5419,21 @@ gimplify_asm_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
       vec_safe_push (inputs, link);
     }
 
-  for (link = ASM_CLOBBERS (expr); link; ++i, link = TREE_CHAIN (link))
+  link_next = NULL_TREE;
+  for (link = ASM_CLOBBERS (expr); link; ++i, link = link_next)
+    {
+      link_next = TREE_CHAIN (link);
+      TREE_CHAIN (link) = NULL_TREE;
       vec_safe_push (clobbers, link);
+    }
 
-  for (link = ASM_LABELS (expr); link; ++i, link = TREE_CHAIN (link))
+  link_next = NULL_TREE;
+  for (link = ASM_LABELS (expr); link; ++i, link = link_next)
+    {
+      link_next = TREE_CHAIN (link);
+      TREE_CHAIN (link) = NULL_TREE;
       vec_safe_push (labels, link);
+    }
 
   /* Do not add ASMs with errors to the gimple IL stream.  */
   if (ret != GS_ERROR)