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Improve lzjb decompress performance by reorganizing the code

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to tighten the copy loop.

Submitted by:	Denis Ahrens <denis h3q com>
MFC after:	2 weeks
Approved by:	re (gjb)
This commit is contained in:
Xin LI 2013-10-08 01:38:24 +00:00
parent 64db896617
commit 6eb151f212
1 changed files with 3 additions and 1 deletions
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4
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/lzjb.c
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@ -117,7 +117,9 @@ lzjb_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
src += 2;
if ((cpy = dst - offset) < (uchar_t *)d_start)
return (-1);
while (--mlen >= 0 && dst < d_end)
if (mlen > (d_end - dst))
mlen = d_end - dst;
while (--mlen >= 0)
*dst++ = *cpy++;
} else {
*dst++ = *src++;