exec_list: Add a prepend function.

This complements the existing append function. It's implemented in a
rather simple way right now; it could be changed if performance is a
concern.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Connor Abbott <connor.abbott@intel.com>

diff --git a/src/glsl/list.h b/src/glsl/list.h
index a4444bda9e6a180530c5375d21e069d1ddbe156f..66028f649d43a24e9b74badba692f5dc110b605f 100644 (file)
--- a/src/glsl/list.h
+++ b/src/glsl/list.h
@@ -345,9 +345,15 @@ struct exec_list {
    void move_nodes_to(exec_list *target);
 
    /**
-    * Append all nodes from the source list to the target list
+    * Append all nodes from the source list to the end of the target list
     */
    void append_list(exec_list *source);
+
+   /**
+    * Prepend all nodes from the source list to the beginning of the target
+    * list
+    */
+   void prepend_list(exec_list *source);
 #endif
 };
 
@@ -478,6 +484,13 @@ exec_list_append(struct exec_list *list, struct exec_list *source)
    exec_list_make_empty(source);
 }
 
+static inline void
+exec_list_prepend(struct exec_list *list, struct exec_list *source)
+{
+   exec_list_append(source, list);
+   exec_list_move_nodes_to(source, list);
+}
+
 static inline void
 exec_node_insert_list_before(struct exec_node *n, struct exec_list *before)
 {
@@ -554,6 +567,11 @@ inline void exec_list::append_list(exec_list *source)
    exec_list_append(this, source);
 }
 
+inline void exec_list::prepend_list(exec_list *source)
+{
+   exec_list_prepend(this, source);
+}
+
 inline void exec_node::insert_before(exec_list *before)
 {
    exec_node_insert_list_before(this, before);