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authorJoakim Tjernlund <joakim.tjernlund@transmode.se>2004-09-23 07:23:26 +0000
committerJoakim Tjernlund <joakim.tjernlund@transmode.se>2004-09-23 07:23:26 +0000
commite6c7d1de2a601b0c630df62e02c27a05962669d8 (patch)
tree55cdd7f9bc15daf363a7c6570ef85b1843b3de0a /libc/sysdeps/linux/cris/bits/byteswap.h
parent553bc05e524989e5e7567a07240900375067f9ff (diff)
Add bswap_64 macro and uClibc_page.h. From Peter Kjellerstedt.
Diffstat (limited to 'libc/sysdeps/linux/cris/bits/byteswap.h')
-rw-r--r--libc/sysdeps/linux/cris/bits/byteswap.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/cris/bits/byteswap.h b/libc/sysdeps/linux/cris/bits/byteswap.h
index f152d73e8..e35c4b63f 100644
--- a/libc/sysdeps/linux/cris/bits/byteswap.h
+++ b/libc/sysdeps/linux/cris/bits/byteswap.h
@@ -45,4 +45,31 @@ static inline unsigned long __fswab32(unsigned long x)
___swab32((x)) : \
__fswab32((x)))
+#if defined __GNUC__ && __GNUC__ >= 2
+/* 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))
+
+# 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; }))
+#endif
+
#endif /* _BITS_BYTESWAP_H */