--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os_cpu/linux_x86/bytes_linux_x86.inline.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 1999, 2010, 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.
+ *
+ */
+
+#ifndef OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP
+#define OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP
+
+#include <byteswap.h>
+
+// Efficient swapping of data bytes from Java byte
+// ordering to native byte ordering and vice versa.
+inline u2   Bytes::swap_u2(u2 x) {
+#ifdef AMD64
+  return bswap_16(x);
+#else
+  u2 ret;
+  __asm__ __volatile__ (
+    "movw %0, %%ax;"
+    "xchg %%al, %%ah;"
+    "movw %%ax, %0"
+    :"=r" (ret)      // output : register 0 => ret
+    :"0"  (x)        // input  : x => register 0
+    :"ax", "0"       // clobbered registers
+  );
+  return ret;
+#endif // AMD64
+}
+
+inline u4   Bytes::swap_u4(u4 x) {
+#ifdef AMD64
+  return bswap_32(x);
+#else
+  u4 ret;
+  __asm__ __volatile__ (
+    "bswap %0"
+    :"=r" (ret)      // output : register 0 => ret
+    :"0"  (x)        // input  : x => register 0
+    :"0"             // clobbered register
+  );
+  return ret;
+#endif // AMD64
+}
+
+#ifdef AMD64
+inline u8 Bytes::swap_u8(u8 x) {
+#ifdef SPARC_WORKS
+  // workaround for SunStudio12 CR6615391
+  __asm__ __volatile__ (
+    "bswapq %0"
+    :"=r" (x)        // output : register 0 => x
+    :"0"  (x)        // input  : x => register 0
+    :"0"             // clobbered register
+  );
+  return x;
+#else
+  return bswap_64(x);
+#endif
+}
+#else
+// Helper function for swap_u8
+inline u8   Bytes::swap_u8_base(u4 x, u4 y) {
+  return (((u8)swap_u4(x))<<32) | swap_u4(y);
+}
+
+inline u8 Bytes::swap_u8(u8 x) {
+  return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
+}
+#endif // !AMD64
+
+#endif // OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP