--- a/graal/com.oracle.graal.lir/src/com/oracle/graal/lir/stackslotalloc/InstructionNumberer.java	Wed Feb 04 14:39:22 2015 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,104 +0,0 @@
-/*
- * Copyright (c) 2014, 2015, 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
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-package com.oracle.graal.lir.stackslotalloc;
-
-import static com.oracle.graal.api.code.CodeUtil.*;
-
-import java.util.*;
-
-import com.oracle.graal.compiler.common.cfg.*;
-import com.oracle.graal.lir.*;
-
-public class InstructionNumberer {
-
-    private final LIRInstruction[] opIdToInstructionMap;
-
-    protected InstructionNumberer(LIR lir) {
-        // Assign IDs to LIR nodes and build a mapping, lirOps, from ID to LIRInstruction node.
-        int numInstructions = 0;
-        for (AbstractBlock<?> block : lir.getControlFlowGraph().getBlocks()) {
-            numInstructions += lir.getLIRforBlock(block).size();
-        }
-
-        // initialize with correct length
-        opIdToInstructionMap = new LIRInstruction[numInstructions];
-    }
-
-    /**
-     * Converts an {@linkplain LIRInstruction#id instruction id} to an instruction index. All LIR
-     * instructions in a method have an index one greater than their linear-scan order predecessor
-     * with the first instruction having an index of 0.
-     */
-    private static int opIdToIndex(int opId) {
-        return opId >> 1;
-    }
-
-    /**
-     * Retrieves the {@link LIRInstruction} based on its {@linkplain LIRInstruction#id id}.
-     *
-     * @param opId an instruction {@linkplain LIRInstruction#id id}
-     * @return the instruction whose {@linkplain LIRInstruction#id} {@code == id}
-     */
-    protected LIRInstruction instructionForId(int opId) {
-        assert isEven(opId) : "opId not even";
-        LIRInstruction instr = opIdToInstructionMap[opIdToIndex(opId)];
-        assert instr.id() == opId;
-        return instr;
-    }
-
-    /**
-     * Numbers all instructions in all blocks.
-     */
-    protected void numberInstructions(LIR lir, List<? extends AbstractBlock<?>> sortedBlocks) {
-
-        int opId = 0;
-        int index = 0;
-        for (AbstractBlock<?> block : sortedBlocks) {
-
-            List<LIRInstruction> instructions = lir.getLIRforBlock(block);
-
-            int numInst = instructions.size();
-            for (int j = 0; j < numInst; j++) {
-                LIRInstruction op = instructions.get(j);
-                op.setId(opId);
-
-                opIdToInstructionMap[index] = op;
-                assert instructionForId(opId) == op : "must match";
-
-                index++;
-                opId += 2; // numbering of lirOps by two
-            }
-        }
-        assert index == opIdToInstructionMap.length : "must match";
-        assert (index << 1) == opId : "must match: " + (index << 1);
-        assert opId - 2 == maxOpId() : "must match";
-    }
-
-    /**
-     * Gets the highest instruction id allocated by this object.
-     */
-    public int maxOpId() {
-        assert opIdToInstructionMap.length > 0 : "no operations";
-        return (opIdToInstructionMap.length - 1) << 1;
-    }
-}

--- a/graal/com.oracle.graal.lir/src/com/oracle/graal/lir/stackslotalloc/LSStackSlotAllocator.java	Wed Feb 04 14:39:22 2015 +0100
+++ b/graal/com.oracle.graal.lir/src/com/oracle/graal/lir/stackslotalloc/LSStackSlotAllocator.java	Wed Feb 04 15:02:36 2015 +0100
@@ -72,16 +72,16 @@
         }
     }
 
-    private static final class Allocator extends InstructionNumberer {
+    private static final class Allocator {
         private final LIR lir;
         private final FrameMapBuilderTool frameMapBuilder;
         private final StackInterval[] stackSlotMap;
         private final PriorityQueue<StackInterval> unhandled;
         private final PriorityQueue<StackInterval> active;
         private final List<? extends AbstractBlock<?>> sortedBlocks;
+        private final int maxOpId;
 
         private Allocator(LIR lir, FrameMapBuilderTool frameMapBuilder) {
-            super(lir);
             this.lir = lir;
             this.frameMapBuilder = frameMapBuilder;
             this.stackSlotMap = new StackInterval[frameMapBuilder.getNumberOfStackSlots()];
@@ -94,7 +94,7 @@
 
             try (TimerCloseable t = NumInstTimer.start()) {
                 // step 1: number instructions
-                numberInstructions(lir, sortedBlocks);
+                this.maxOpId = numberInstructions(lir, sortedBlocks);
             }
         }
 
@@ -135,6 +135,35 @@
         }
 
         // ====================
+        // step 1: number instructions
+        // ====================
+
+        /**
+         * Numbers all instructions in all blocks.
+         *
+         * @return The id of the last operation.
+         */
+        private static int numberInstructions(LIR lir, List<? extends AbstractBlock<?>> sortedBlocks) {
+            int opId = 0;
+            int index = 0;
+            for (AbstractBlock<?> block : sortedBlocks) {
+
+                List<LIRInstruction> instructions = lir.getLIRforBlock(block);
+
+                int numInst = instructions.size();
+                for (int j = 0; j < numInst; j++) {
+                    LIRInstruction op = instructions.get(j);
+                    op.setId(opId);
+
+                    index++;
+                    opId += 2; // numbering of lirOps by two
+                }
+            }
+            assert (index << 1) == opId : "must match: " + (index << 1);
+            return opId - 2;
+        }
+
+        // ====================
         // step 2: build intervals
         // ====================
 
@@ -357,6 +386,13 @@
         //
         // ====================
 
+        /**
+         * Gets the highest instruction id.
+         */
+        private int maxOpId() {
+            return maxOpId;
+        }
+
         private StackInterval get(VirtualStackSlot stackSlot) {
             return stackSlotMap[stackSlot.getId()];
         }