--- a/graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/RegisterSaveLayout.java	Wed Apr 30 12:27:27 2014 -0700
+++ b/graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/RegisterSaveLayout.java	Wed Apr 30 15:08:09 2014 -1000
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,16 +33,16 @@
     /**
      * Keys.
      */
-    private Register[] registers;
+    private final Register[] registers;
 
     /**
      * Slot indexes relative to stack pointer.
      */
-    private int[] slots;
+    private final int[] slots;
 
     /**
      * Creates a map from registers to frame slots.
-     * 
+     *
      * @param registers the keys in the map
      * @param slots frame slot index for each register in {@code registers}
      */
@@ -55,6 +55,21 @@
     }
 
     /**
+     * Gets the frame slot index for a given register.
+     *
+     * @param register register to get the frame slot index for
+     * @return frame slot index
+     */
+    public int registerToSlot(Register register) {
+        for (int i = 0; i < registers.length; i++) {
+            if (register.equals(registers[i])) {
+                return slots[i];
+            }
+        }
+        throw new IllegalArgumentException(register + " not saved by this layout: " + this);
+    }
+
+    /**
      * Gets this layout information as a {@link Map} from registers to slots.
      */
     public Map<Register, Integer> registersToSlots(boolean sorted) {