use REV on aarch64 for endianness swapping
always_inline u16
clib_byte_swap_u16 (u16 x)
{
+#if defined (__aarch64__)
+ if (!__builtin_constant_p (x))
+ {
+ __asm__ ("rev16 %w0, %w0":"+r" (x));
+ return x;
+ }
+#endif
return (x >> 8) | (x << 8);
}
@@ -74,6 +81,12 @@ clib_byte_swap_u32 (u32 x)
asm volatile ("bswap %0":"=r" (x):"0" (x));
return x;
}
+#elif defined (__aarch64__)
+ if (!__builtin_constant_p (x))
+ {
+ __asm__ ("rev %w0, %w0":"+r" (x));
+ return x;
+ }
#endif
return ((x << 24) | ((x & 0xff00) << 8) | ((x >> 8) & 0xff00) | (x >> 24));
}
@@ -93,6 +106,12 @@ clib_byte_swap_u64 (u64 x)
asm volatile ("bswapq %0":"=r" (x):"0" (x));
return x;
}
+#elif defined (__aarch64__)
+ if (!__builtin_constant_p (x))
+ {
+ __asm__ ("rev %0, %0":"+r" (x));
+ return x;
+ }
#endif
#define _(x,n,i) \
((((x) >> (8*(i))) & 0xff) << (8*((n)-(i)-1)))
