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xdiff: optimise for no whitespace difference when ignoring whitespace.

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In xdl_recmatch, do the memcmp to check if the two lines are equal before
checking if whitespace flags are set.  If the lines are identical, then
there is no need to check if they differ only in whitespace.
This makes the common case (there is no whitespace difference) faster.
It costs the case where lines are the same length and contain
whitespace differences, but the common case is more than 20% faster.

Signed-off-by: Dylan Reid <dgreid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Dylan Reid 2010-07-05 23:11:17 -04:00 committed by Junio C Hamano
parent 6b097788f8
commit b4cf0f1784
1 changed files with 3 additions and 1 deletions
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xdiff/xutils.c
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@ -190,8 +190,10 @@ int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags)
{
int i1, i2;
if (s1 == s2 && !memcmp(l1, l2, s1))
return 1;
if (!(flags & XDF_WHITESPACE_FLAGS))
return s1 == s2 && !memcmp(l1, l2, s1);
return 0;
i1 = 0;
i2 = 0;