ia64: split 16bit funcs out of byteswap.h and into byteswap-16.h

The main tree split the 16bit byteswap funcs out into a dedicated header.
Do the same for ia64.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

ChangeLog.ia64

@@ -1,3 +1,9 @@
+2012-04-27  Mike Frysinger  <vapier@gentoo.org>
+
+	* sysdeps/ia64/bits/byteswap.h (__bswap_16): Removed.
+	Include <bits/byteswap-16.h> to get __bswap_16.
+	* sysdeps/ia64/bits/byteswap-16.h: New file.
+
 2012-04-27  Mike Frysinger  <vapier@gentoo.org>
 
 	* sysdeps/unix/sysv/linux/ia64/sys/ucontext.h: Delete __cplusplus

sysdeps/ia64/bits/byteswap-16.h

@@ -0,0 +1,42 @@
+/* Macros to swap the order of bytes in 16-bit integer values.
+   Copyright (C) 1997-2012 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
+
+#if defined __GNUC__ && __GNUC__ >= 2
+# define __bswap_16(x) \
+     (__extension__							      \
+      ({ register unsigned short int __v, __x = (x);			      \
+	 if (__builtin_constant_p (x))					      \
+	   __v = __bswap_constant_16 (__x);				      \
+	 else								      \
+	   __asm__ __volatile__ ("shl %0 = %1, 48 ;;"			      \
+				 "mux1 %0 = %0, @rev ;;"		      \
+				 : "=r" (__v)				      \
+				 : "r" ((unsigned short int) (__x)));	      \
+	 __v; }))
+#else
+/* This is better than nothing.  */
+static __inline unsigned short int
+__bswap_16 (unsigned short int __bsx)
+{
+  return __bswap_constant_16 (__bsx);
+}
+#endif

sysdeps/ia64/bits/byteswap.h

@@ -1,6 +1,5 @@
 /* Macros to swap the order of bytes in integer values.
-   Copyright (C) 1997,1998,2000,2002,2003,2008,2011
+   Copyright (C) 1997-2012 Free Software Foundation, Inc.
-   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
@@ -28,27 +27,8 @@
 #define __bswap_constant_16(x) \
      ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
 
-#if defined __GNUC__ && __GNUC__ >= 2
+/* Get __bswap_16.  */
-# define __bswap_16(x) \
+#include <bits/byteswap-16.h>
-     (__extension__							      \
-      ({ register unsigned short int __v, __x = (x);			      \
-	 if (__builtin_constant_p (x))					      \
-	   __v = __bswap_constant_16 (__x);				      \
-	 else								      \
-	   __asm__ __volatile__ ("shl %0 = %1, 48 ;;"			      \
-				 "mux1 %0 = %0, @rev ;;"		      \
-				 : "=r" (__v)				      \
-				 : "r" ((unsigned short int) (__x)));	      \
-	 __v; }))
-#else
-/* This is better than nothing.  */
-static __inline unsigned short int
-__bswap_16 (unsigned short int __bsx)
-{
-  return __bswap_constant_16 (__bsx);
-}
-#endif
-
 
 /* Swap bytes in 32 bit value.  */
 #define __bswap_constant_32(x) \