* tree-phinodes.c (phi_reverse): New.

	* tree-cfg.c (tree_make_forwarder_block, tree_duplicate_bb):
	Use it.
	* tree-flow.h: Add a prototype for phi_reverse.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90344 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 15 insertions, 0 deletions

diff --git a/gcc/tree-phinodes.c b/gcc/tree-phinodes.c
index 0d621b53339..a38a57273be 100644
--- a/gcc/tree-phinodes.c
+++ b/gcc/tree-phinodes.c
@@ -491,6 +491,21 @@ remove_all_phi_nodes_for (bitmap vars)
     }
 }
 
+/* Reverse the order of PHI nodes in the chain PHI.
+   Return the new head of the chain (old last PHI node).  */
+
+tree
+phi_reverse (tree phi)
+{
+  tree prev = NULL_TREE, next;
+  for (; phi; phi = next)
+    {
+      next = PHI_CHAIN (phi);
+      PHI_CHAIN (phi) = prev;
+      prev = phi;
+    }
+  return prev;
+}
 
 #include "gt-tree-phinodes.h"