--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotRegisterAllocationConfig.java	Thu May 28 11:04:19 2015 +0200
@@ -0,0 +1,91 @@
+/*
+ * 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.hotspot.amd64;
+
+import static com.oracle.graal.amd64.AMD64.*;
+
+import java.util.*;
+
+import com.oracle.graal.api.code.*;
+import com.oracle.graal.compiler.common.alloc.*;
+
+class AMD64HotSpotRegisterAllocationConfig extends RegisterAllocationConfig {
+    /**
+     * Specify priority of register selection within phases of register allocation. Highest priority
+     * is first. A useful heuristic is to give registers a low priority when they are required by
+     * machine instructions, like EAX and EDX on I486, and choose no-save registers before
+     * save-on-call, & save-on-call before save-on-entry. Registers which participate in fixed
+     * calling sequences should come last. Registers which are used as pairs must fall on an even
+     * boundary.
+     *
+     * Adopted from x86_64.ad.
+     */
+    // @formatter:off
+    static final Register[] registerAllocationOrder = {
+        r10, r11, r8, r9, r12, rcx, rbx, rdi, rdx, rsi, rax, rbp, r13, r14, /*r15,*/ /*rsp,*/
+        xmm0, xmm1, xmm2,  xmm3,  xmm4,  xmm5,  xmm6,  xmm7,
+        xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15
+    };
+    // @formatter:on
+
+    public AMD64HotSpotRegisterAllocationConfig(RegisterConfig registerConfig) {
+        super(registerConfig);
+    }
+
+    @Override
+    protected Register[] initAllocatable(Register[] registers) {
+        BitSet regMap = new BitSet(registerConfig.getAllocatableRegisters().length);
+        Register[] regs = super.initAllocatable(registers);
+        for (Register reg : regs) {
+            regMap.set(reg.number);
+        }
+
+        Register[] allocatableRegisters = new Register[regs.length];
+        int i = 0;
+        for (Register reg : registerAllocationOrder) {
+            if (regMap.get(reg.number)) {
+                allocatableRegisters[i++] = reg;
+            }
+        }
+
+        assert i == allocatableRegisters.length;
+        return allocatableRegisters;
+    }
+
+    @Override
+    protected AllocatableRegisters createAllocatableRegisters(Register[] registers) {
+        int min = Integer.MAX_VALUE;
+        int max = Integer.MIN_VALUE;
+        for (Register reg : registers) {
+            int number = reg.number;
+            if (number < min) {
+                min = number;
+            }
+            if (number > max) {
+                max = number;
+            }
+        }
+        assert min < max;
+        return new AllocatableRegisters(registers, min, max);
+    }
+}