Byte swapping definitions for s390-64.
authordrepper <drepper>
Fri, 16 Mar 2001 09:16:28 +0000 (09:16 +0000)
committerdrepper <drepper>
Fri, 16 Mar 2001 09:16:28 +0000 (09:16 +0000)
sysdeps/s390/s390-64/bits/byteswap.h [new file with mode: 0644]

diff --git a/sysdeps/s390/s390-64/bits/byteswap.h b/sysdeps/s390/s390-64/bits/byteswap.h
new file mode 100644 (file)
index 0000000..71b33f0
--- /dev/null
@@ -0,0 +1,93 @@
+/* Macros to swap the order of bytes in integer values.  64 bit S/390 version.
+   Copyright (C) 2001 Free Software Foundation, Inc.
+   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
+   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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#if !defined _BYTESWAP_H && !defined _NETINET_IN_H
+# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
+#endif
+
+#define __bswap_constant_16(x) \
+     ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
+
+/* Swap bytes in 16 bit value. */
+#if defined __GNUC__ && __GNUC__ >= 2
+# define __bswap_16(x) \
+     (__extension__                                                          \
+      ({ unsigned short int __v;                                             \
+        if (__builtin_constant_p (x))                                        \
+          __v = __bswap_constant_16 (x);                                     \
+        else {                                                               \
+           unsigned short int __tmp = (unsigned short int) (x);               \
+           __asm__ __volatile__ (                                             \
+              "lrvh %0,%1"                                                    \
+              : "=&d" (__v) : "m" (__tmp) );                                  \
+         }                                                                    \
+        __v; }))
+#else
+/* This is better than nothing.  */
+#define __bswap_16(x) __bswap_constant_16 (x)
+#endif
+
+/* Swap bytes in 32 bit value.  */
+#define __bswap_constant_32(x) \
+     ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) |                      \
+      (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
+
+#if defined __GNUC__ && __GNUC__ >= 2
+#  define __bswap_32(x) \
+     (__extension__                                                          \
+      ({ unsigned int __v;                                                   \
+        if (__builtin_constant_p (x))                                        \
+          __v = __bswap_constant_32 (x);                                     \
+        else {                                                               \
+           unsigned int __tmp = (unsigned int) (x);                           \
+           __asm__ __volatile__ (                                             \
+              "lrv   %0,%1"                                                   \
+              : "=&d" (__v) : "m" (__tmp));                                   \
+         }                                                                    \
+        __v; }))
+#else
+# define __bswap_32(x) __bswap_constant_32 (x)
+#endif
+
+/* Swap bytes in 64 bit value.  */
+#define __bswap_constant_64(x) \
+     ((((x)&0xff00000000000000) >> 56) | (((x)&0x00ff000000000000) >> 40) |  \
+      (((x)&0x0000ff0000000000) >> 24) | (((x)&0x000000ff00000000) >>  8) |  \
+      (((x)&0x00000000ff000000) <<  8) | (((x)&0x0000000000ff0000) << 24) |  \
+      (((x)&0x000000000000ff00) << 40) | (((x)&0x00000000000000ff) << 56))
+
+#if defined __GNUC__ && __GNUC__ >= 2
+#  define __bswap_64(x) \
+     (__extension__                                                          \
+      ({ unsigned long __w;                                                  \
+        if (__builtin_constant_p (x))                                        \
+          __w = __bswap_constant_64 (x);                                     \
+        else {                                                               \
+           unsigned long __tmp = (unsigned long) (x);                         \
+           __asm__ __volatile__ (                                             \
+              "lrvg  %0,%1"                                                   \
+              : "=&d" (__w) : "m" (__tmp));                                   \
+         }                                                                    \
+        __w; }))
+#else
+# define __bswap_64(x) __bswap_constant_64 (x)
+#endif
+
+