[S390] convert/optimize csum_fold() to C

In the meantime gcc generates better code than the old inline
assemblies do. Original inline assembly results in:

lr	%r1,%r2
sr	%r3,%r3
lr	%r2,%r1
srdl	%r2,16
alr	%r2,%r3
alr	%r1,%r2
srl	%r1,16
xilf	%r1,65535
llghr	%r2,%r1
br	%r14

Out of the C code gcc generates this:

rll	%r1,%r2,16
ar	%r1,%r2
srl	%r1,16
xilf	%r1,65535
llghr	%r2,%r1
br	%r14

In addition we don't have any static register allocations anymore and
gcc is free to shuffle instructions around for better pipeline usage.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 21 deletions

diff --git a/arch/s390/include/asm/checksum.h b/arch/s390/include/asm/checksum.h
index d5a8e7c1477c..6c00f6800a34 100644
--- a/arch/s390/include/asm/checksum.h
+++ b/arch/s390/include/asm/checksum.h
@@ -78,28 +78,11 @@ csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
  */
 static inline __sum16 csum_fold(__wsum sum)
 {
-#ifndef __s390x__
-        register_pair rp;
+        u32 csum = (__force u32) sum;
 
-        asm volatile(
-                "       slr     %N1,%N1\n"      /* %0 = H L */
-                "       lr      %1,%0\n"        /* %0 = H L, %1 = H L 0 0 */
-                "       srdl    %1,16\n"        /* %0 = H L, %1 = 0 H L 0 */
-                "       alr     %1,%N1\n"       /* %0 = H L, %1 = L H L 0 */
-                "       alr     %0,%1\n"        /* %0 = H+L+C L+H */
-                "       srl     %0,16\n"        /* %0 = H+L+C */
-                : "+&d" (sum), "=d" (rp) : : "cc");
-#else /* __s390x__ */
-        asm volatile(
-                "       sr      3,3\n"          /* %0 = H*65536 + L */
-                "       lr      2,%0\n"         /* %0 = H L, 2/3 = H L / 0 0 */
-                "       srdl    2,16\n"         /* %0 = H L, 2/3 = 0 H / L 0 */
-                "       alr     2,3\n"          /* %0 = H L, 2/3 = L H / L 0 */
-                "       alr     %0,2\n"         /* %0 = H+L+C L+H */
-                "       srl     %0,16\n"        /* %0 = H+L+C */
-                : "+&d" (sum) : : "cc", "2", "3");
-#endif /* __s390x__ */
-        return (__force __sum16) ~sum;
+        csum += (csum >> 16) + (csum << 16);
+        csum >>= 16;
+        return (__force __sum16) ~csum;
 }
 
 /*