*/
static inline __sum16 csum_fold(__wsum sum)
{
- unsigned int tmp;
-
- /* swap the two 16-bit halves of sum */
- __asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum));
- /* if there is a carry from adding the two 16-bit halves,
- it will carry from the lower half into the upper half,
- giving us the correct sum in the upper half. */
- return (__force __sum16)(~((__force u32)sum + tmp) >> 16);
+ u32 tmp = (__force u32)sum;
+
+ /*
+ * swap the two 16-bit halves of sum
+ * if there is a carry from adding the two 16-bit halves,
+ * it will carry from the lower half into the upper half,
+ * giving us the correct sum in the upper half.
+ */
+ return (__force __sum16)(~(tmp + rol32(tmp, 16)) >> 16);
}
static inline u32 from64to32(u64 x)