From b4cf0f1784362fb4aa2383d8d5d829caa92ca3a0 Mon Sep 17 00:00:00 2001 From: Dylan Reid Date: Mon, 5 Jul 2010 23:11:17 -0400 Subject: [PATCH] xdiff: optimise for no whitespace difference when ignoring whitespace. 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 Signed-off-by: Junio C Hamano --- xdiff/xutils.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/xdiff/xutils.c b/xdiff/xutils.c index bc12f2989..22f9bd692 100644 --- a/xdiff/xutils.c +++ b/xdiff/xutils.c @@ -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; -- 2.26.2