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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/cris/bits
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/cris/bits')
-rw-r--r--libc/sysdeps/linux/cris/bits/byteswap.h79
1 files changed, 8 insertions, 71 deletions
diff --git a/libc/sysdeps/linux/cris/bits/byteswap.h b/libc/sysdeps/linux/cris/bits/byteswap.h
index 4027456ac..a82f9c098 100644
--- a/libc/sysdeps/linux/cris/bits/byteswap.h
+++ b/libc/sysdeps/linux/cris/bits/byteswap.h
@@ -1,83 +1,20 @@
-#ifndef _BITS_BYTESWAP_H
-#define _BITS_BYTESWAP_H 1
+#ifndef _ASM_BITS_BYTESWAP_H
+#define _ASM_BITS_BYTESWAP_H 1
/* CRIS specific byte swap operations: 16, 32 and 64-bit */
-/* Swap bytes in 16 bit value. */
-#define __bswap_constant_16(x) \
-({ \
- unsigned short __x = (x); \
- ((unsigned short)( \
- (((unsigned short)(__x) & (unsigned short)0x00ffu) << 8) | \
- (((unsigned short)(__x) & (unsigned short)0xff00u) >> 8) )); \
-})
-
-#if defined __GNUC__ && __GNUC__ >= 2
-# define __bswap_16(x) \
+#define __bswap_non_constant_16(x) \
__extension__ \
({ unsigned short __bswap_16_v; \
- if (__builtin_constant_p (x)) \
- __bswap_16_v = __bswap_constant_16 (x); \
- else \
- __asm__ ("swapb %0" : "=r" (__bswap_16_v) : "0" (x)); \
+ __asm__ ("swapb %0" : "=r" (__bswap_16_v) : "0" (x)); \
__bswap_16_v; })
-#else
-# define __bswap_16(x) __bswap_constant_16 (x)
-#endif
-
-
-/* Swap bytes in 32 bit value. */
-#define __bswap_constant_32(x) \
-({ \
- unsigned long __x = (x); \
- ((unsigned long)( \
- (((unsigned long)(__x) & (unsigned long)0x000000fful) << 24) | \
- (((unsigned long)(__x) & (unsigned long)0x0000ff00ul) << 8) | \
- (((unsigned long)(__x) & (unsigned long)0x00ff0000ul) >> 8) | \
- (((unsigned long)(__x) & (unsigned long)0xff000000ul) >> 24) )); \
-})
-#if defined __GNUC__ && __GNUC__ >= 2
-# define __bswap_32(x) \
+#define __bswap_non_constant_32(x) \
__extension__ \
- ({ unsigned long __bswap_32_v; \
- if (__builtin_constant_p (x)) \
- __bswap_32_v = __bswap_constant_32 (x); \
- else \
- __asm__ ("swapwb %0" : "=r" (__bswap_32_v) : "0" (x)); \
+ ({ unsigned int __bswap_32_v; \
+ __asm__ ("swapwb %0" : "=r" (__bswap_32_v) : "0" (x)); \
__bswap_32_v; })
-#else
-# define __bswap_32(x) __bswap_constant_32 (x)
-#endif
-
-
-/* Swap bytes in 64 bit value. */
-# define __bswap_constant_64(x) \
- ((((x) & 0xff00000000000000ull) >> 56) \
- | (((x) & 0x00ff000000000000ull) >> 40) \
- | (((x) & 0x0000ff0000000000ull) >> 24) \
- | (((x) & 0x000000ff00000000ull) >> 8) \
- | (((x) & 0x00000000ff000000ull) << 8) \
- | (((x) & 0x0000000000ff0000ull) << 24) \
- | (((x) & 0x000000000000ff00ull) << 40) \
- | (((x) & 0x00000000000000ffull) << 56))
-#if defined __GNUC__ && __GNUC__ >= 2
-# define __bswap_64(x) \
- (__extension__ \
- ({ union { __extension__ unsigned long long int __ll; \
- unsigned int __l[2]; } __w, __r; \
- if (__builtin_constant_p (x)) \
- __r.__ll = __bswap_constant_64 (x); \
- else \
- { \
- __w.__ll = (x); \
- __r.__l[0] = __bswap_32 (__w.__l[1]); \
- __r.__l[1] = __bswap_32 (__w.__l[0]); \
- } \
- __r.__ll; }))
-#else
-# define __bswap_64(x) __bswap_constant_64 (x)
#endif
-#endif /* _BITS_BYTESWAP_H */
+#include <bits/byteswap-common.h>