Replace the shifting and masking of x with a rotation. This generates
better assembly.
Signed-off-by: Charlie Jenkins <charlie@xxxxxxxxxxxx>
---
arch/parisc/lib/checksum.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/arch/parisc/lib/checksum.c b/arch/parisc/lib/checksum.c
index eaa660491e24..1ae8cc730d13 100644
--- a/arch/parisc/lib/checksum.c
+++ b/arch/parisc/lib/checksum.c
@@ -27,11 +27,8 @@
static inline unsigned short from32to16(unsigned int x)
{
- /* 32 bits --> 16 bits + carry */
- x = (x & 0xffff) + (x >> 16);
- /* 16 bits + carry --> 16 bits including carry */
- x = (x & 0xffff) + (x >> 16);
- return (unsigned short)x;
+ x += ror32(x, 16);
+ return (unsigned short)(x >> 16);
}
unsigned int do_csum(const unsigned char *buff, int len)
--
2.34.1
