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authorMike Frysinger <vapier@gentoo.org>2009-07-20 16:38:30 -0400
committerMike Frysinger <vapier@gentoo.org>2009-07-21 22:26:05 -0400
commit6ca56dd4d711c731d010c484c20384097615f6cd (patch)
tree71ae0f7709dc2841f9ebf10f18e7ee182ee15624 /libc/sysdeps/linux/m68k/bits/byteswap.h
parent4a2724d93bcd8626f2cebead9b263b4f9f86541d (diff)
byteswap: unify common definitions
The majority of the byteswap functions are the same across all arches, so setup a common header to provide definitions if they don't exist. This allows arches to override only the ones they actually want to implement with inline assembly. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'libc/sysdeps/linux/m68k/bits/byteswap.h')
-rw-r--r--libc/sysdeps/linux/m68k/bits/byteswap.h50
1 files changed, 10 insertions, 40 deletions
diff --git a/libc/sysdeps/linux/m68k/bits/byteswap.h b/libc/sysdeps/linux/m68k/bits/byteswap.h
index f5ec91682..488474212 100644
--- a/libc/sysdeps/linux/m68k/bits/byteswap.h
+++ b/libc/sysdeps/linux/m68k/bits/byteswap.h
@@ -17,51 +17,21 @@
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
-
-#ifndef _BITS_BYTESWAP_H
-#define _BITS_BYTESWAP_H 1
-
-/* Swap bytes in 16 bit value. We don't provide an assembler version
- because GCC is smart enough to generate optimal assembler output, and
- this allows for better cse. */
-#define __bswap_16(x) \
- ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
-
-/* Swap bytes in 32 bit value. */
-#define __bswap_constant_32(x) \
- ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
- (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
+#ifndef _ASM_BITS_BYTESWAP_H
+#define _ASM_BITS_BYTESWAP_H 1
-#if defined __GNUC__ && __GNUC__ >= 2 && !defined __mcoldfire__
-# define __bswap_32(x) \
+#if !defined __mcoldfire__
+# define __bswap_non_constant_32(x) \
__extension__ \
({ unsigned int __bswap_32_v; \
- if (__builtin_constant_p (x)) \
- __bswap_32_v = __bswap_constant_32 (x); \
- else \
- __asm__ __volatile__ ("ror%.w %#8, %0;" \
- "swap %0;" \
- "ror%.w %#8, %0" \
- : "=d" (__bswap_32_v) \
- : "0" ((unsigned int) (x))); \
+ __asm__ __volatile__ ("ror%.w %#8, %0;" \
+ "swap %0;" \
+ "ror%.w %#8, %0" \
+ : "=d" (__bswap_32_v) \
+ : "0" ((unsigned int) (x))); \
__bswap_32_v; })
-#else
-# define __bswap_32(x) __bswap_constant_32 (x)
#endif
-#if defined __GNUC__ && __GNUC__ >= 2
-/* Swap bytes in 64 bit value. */
-# define __bswap_64(x) \
- __extension__ \
- ({ union { unsigned long long int __ll; \
- unsigned long int __l[2]; } __bswap_64_v, __bswap_64_r; \
- __bswap_64_v.__ll = (x); \
- __bswap_64_r.__l[0] = __bswap_32 (__bswap_64_v.__l[1]); \
- __bswap_64_r.__l[1] = __bswap_32 (__bswap_64_v.__l[0]); \
- __bswap_64_r.__ll; })
#endif
-#endif /* _BITS_BYTESWAP_H */
+#include <bits/byteswap-common.h>