--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/alloc/RegisterAllocationConfig.java	Mon Apr 13 15:01:46 2015 +0200
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2015, 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.compiler.common.alloc;
+
+import static com.oracle.graal.compiler.common.GraalOptions.*;
+
+import java.util.*;
+
+import com.oracle.graal.api.code.*;
+import com.oracle.graal.api.meta.*;
+import com.oracle.graal.compiler.common.*;
+
+/**
+ * Configuration for register allocation. This is different to {@link RegisterConfig} as it only
+ * returns registers specified by {@link GraalOptions#RegisterPressure}.
+ */
+public class RegisterAllocationConfig {
+
+    private static Register findRegister(String name, Register[] all) {
+        for (Register reg : all) {
+            if (reg.name.equals(name)) {
+                return reg;
+            }
+        }
+        throw new IllegalArgumentException("register " + name + " is not allocatable");
+    }
+
+    private static Register[] initAllocatable(Register[] registers) {
+        if (RegisterPressure.getValue() != null) {
+            String[] names = RegisterPressure.getValue().split(",");
+            Register[] regs = new Register[names.length];
+            for (int i = 0; i < names.length; i++) {
+                regs[i] = findRegister(names[i], registers);
+            }
+            return regs;
+        }
+
+        return registers;
+    }
+
+    private final RegisterConfig registerConfig;
+    private final Map<PlatformKind.Key, Register[]> categorized = new HashMap<>();
+    private Register[] cachedRegisters;
+
+    public RegisterAllocationConfig(RegisterConfig registerConfig) {
+        this.registerConfig = registerConfig;
+    }
+
+    /**
+     * Gets the set of registers that can be used by the register allocator for a value of a
+     * particular kind.
+     */
+    public Register[] getAllocatableRegisters(PlatformKind kind) {
+        PlatformKind.Key key = kind.getKey();
+        if (categorized.containsKey(key)) {
+            Register[] val = categorized.get(key);
+            return val;
+        }
+
+        Register[] ret = registerConfig.getAllocatableRegisters(kind, getAllocatableRegisters());
+        categorized.put(key, ret);
+        return ret;
+
+    }
+
+    /**
+     * Gets the set of registers that can be used by the register allocator.
+     */
+    public Register[] getAllocatableRegisters() {
+        if (cachedRegisters == null) {
+            cachedRegisters = initAllocatable(registerConfig.getAllocatableRegisters());
+        }
+        assert cachedRegisters != null;
+        return cachedRegisters;
+    }
+
+    public RegisterConfig getRegisterConfig() {
+        return registerConfig;
+    }
+
+}