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MIPS: Rewrite csum_fold to plain C.

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This isn't only short and easier to read and fully portable but also
shrinks a Malta kernel's by 160 bytes.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2014-12-17 14:06:00 +01:00
parent eaa27f34e9
commit d0f0f63ac1
1 changed files with 8 additions and 14 deletions
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22
arch/mips/include/asm/checksum.h
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@ -103,22 +103,16 @@ __wsum csum_partial_copy_nocheck(const void *src, void *dst,
/* /*
* Fold a partial checksum without adding pseudo headers * Fold a partial checksum without adding pseudo headers
*/ */
static inline __sum16 csum_fold(__wsum sum) static inline __sum16 csum_fold(__wsum csum)
{ {
__asm__( u32 sum = (__force u32)csum;;
" .set push # csum_fold\n"
" .set noat \n"
" sll $1, %0, 16 \n"
" addu %0, $1 \n"
" sltu $1, %0, $1 \n"
" srl %0, %0, 16 \n"
" addu %0, $1 \n"
" xori %0, 0xffff \n"
" .set pop"
: "=r" (sum)
: "0" (sum));
return (__force __sum16)sum; sum += (sum << 16);
csum = (sum < csum);
sum >>= 16;
sum += csum;
return (__force __sum16)~sum;
} }
/* /*