-# elif (defined(__arm__) || defined(__arm)) && !defined(STRICT_ALIGNMENT)
-# define BSWAP8(x) ({ u32 lo=(u64)(x)>>32,hi=(x); \
+# elif defined(__aarch64__)
+# define BSWAP8(x) ({ u64 ret; \
+ asm ("rev %0,%1" \
+ : "=r"(ret) : "r"(x)); ret; })
+# define BSWAP4(x) ({ u32 ret; \
+ asm ("rev %w0,%w1" \
+ : "=r"(ret) : "r"(x)); ret; })
+# elif (defined(__arm__) || defined(__arm)) && !defined(STRICT_ALIGNMENT)
+# define BSWAP8(x) ({ u32 lo=(u64)(x)>>32,hi=(x); \