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Commit 5a8847c8 authored by Christophe Leroy's avatar Christophe Leroy Committed by Scott Wood
Browse files

powerpc: simplify csum_add(a, b) in case a or b is constant 0 



Simplify csum_add(a, b) in case a or b is constant 0

Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: default avatarScott Wood <oss@buserror.net>
parent f867d556

arch/powerpc/include/asm/checksum.h

+6 −0
Original line number Diff line number Diff line
@@ -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