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powerpc: simplify csum_add(a, b) in case a or b is constant 0
author
Christophe Leroy
<christophe.leroy@c-s.fr>
Tue, 22 Sep 2015 14:34:34 +0000
(16:34 +0200)
committer
Scott Wood
<oss@buserror.net>
Sat, 5 Mar 2016 05:04:00 +0000
(23:04 -0600)
Simplify csum_add(a, b) in case a or b is constant 0
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>
arch/powerpc/include/asm/checksum.h
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diff --git
a/arch/powerpc/include/asm/checksum.h
b/arch/powerpc/include/asm/checksum.h
index
1778f75
..
74cd8d8
100644
(file)
--- a/
arch/powerpc/include/asm/checksum.h
+++ b/
arch/powerpc/include/asm/checksum.h
@@
-119,7
+119,13
@@
static inline __wsum csum_add(__wsum csum, __wsum addend)
{
#ifdef __powerpc64__
u64 res = (__force u64)csum;
+#endif
+ if (__builtin_constant_p(csum) && csum == 0)
+ return addend;
+ if (__builtin_constant_p(addend) && addend == 0)
+ return csum;
+#ifdef __powerpc64__
res += (__force u64)addend;
return (__force __wsum)((u32)res + (res >> 32));
#else