1 files changed, 49 insertions, 0 deletions
diff --git a/sysdeps/x86_64/bits/byteswap-16.h b/sysdeps/x86_64/bits/byteswap-16.h
new file mode 100644
index 0000000000..584eb86b74
--- /dev/null
+++ b/sysdeps/x86_64/bits/byteswap-16.h
@@ -0,0 +1,49 @@
+/* Macros to swap the order of bytes in 16-bit integer values.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_BYTESWAP_H
+# error "Never use <bits/byteswap-16.h> directly; include <byteswap.h> instead."
+#endif
+
+#ifdef __GNUC__
+# if __GNUC__ >= 2
+#  define __bswap_16(x) \
+     (__extension__							      \
+      ({ register unsigned short int __v, __x = (unsigned short int) (x);     \
+	 if (__builtin_constant_p (__x))				      \
+	   __v = __bswap_constant_16 (__x);				      \
+	 else								      \
+	   __asm__ ("rorw $8, %w0"					      \
+		    : "=r" (__v)					      \
+		    : "0" (__x)						      \
+		    : "cc");						      \
+	 __v; }))
+# else
+/* This is better than nothing.  */
+#  define __bswap_16(x) \
+     (__extension__							      \
+      ({ register unsigned short int __x = (unsigned short int) (x);	      \
+	 __bswap_constant_16 (__x); }))
+# endif
+#else
+static __inline unsigned short int
+__bswap_16 (unsigned short int __bsx)
+{
+  return __bswap_constant_16 (__bsx);
+}
+#endif