*/
static inline uint8_t revbit8(uint8_t x)
{
+#if __has_builtin(__builtin_bitreverse8)
+ return __builtin_bitreverse8(x);
+#else
/* Assign the correct nibble position. */
x = ((x & 0xf0) >> 4)
| ((x & 0x0f) << 4);
| ((x & 0x22) << 1)
| ((x & 0x11) << 3);
return x;
+#endif
}
/**
*/
static inline uint16_t revbit16(uint16_t x)
{
+#if __has_builtin(__builtin_bitreverse16)
+ return __builtin_bitreverse16(x);
+#else
/* Assign the correct byte position. */
x = bswap16(x);
/* Assign the correct nibble position. */
| ((x & 0x2222) << 1)
| ((x & 0x1111) << 3);
return x;
+#endif
}
/**
*/
static inline uint32_t revbit32(uint32_t x)
{
+#if __has_builtin(__builtin_bitreverse32)
+ return __builtin_bitreverse32(x);
+#else
/* Assign the correct byte position. */
x = bswap32(x);
/* Assign the correct nibble position. */
| ((x & 0x22222222u) << 1)
| ((x & 0x11111111u) << 3);
return x;
+#endif
}
/**
*/
static inline uint64_t revbit64(uint64_t x)
{
+#if __has_builtin(__builtin_bitreverse64)
+ return __builtin_bitreverse64(x);
+#else
/* Assign the correct byte position. */
x = bswap64(x);
/* Assign the correct nibble position. */
| ((x & 0x2222222222222222ull) << 1)
| ((x & 0x1111111111111111ull) << 3);
return x;
+#endif
}
/* Host type specific sizes of these routines. */