-#define SWAB32(x) ((uint32_t)( \
- (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
- (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \
- (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \
- (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24) + \
- STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t))))
+#define SWAB32(x) ((uint32_t)(( \
+ (ROTR(x, 8) & 0xFF00FF00) | \
+ (ROTL(x, 8) & 0x00FF00FF))) + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t)))
+#endif