If sha1's are equal, then there's no point in performing the diff.
In a very unscientific test:
git init &&
dd if=/dev/urandom bs=1M count=30 | hexdump >file1 &&
git add file1 && git commit -m 'add file' &&
git mv file1 file1-moved && chmod +x file1-moved &&
command time git diff --stat
(before) git diff --stat 2.00s user 0.31s system 99% cpu 2.323 total
(after) git diff --stat 0.80s user 0.10s system 98% cpu 0.913 total
Signed-off-by: Zbigniew Jędrzejewski-Szmek <zbyszek@xxxxxxxxx>
---
diff.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/diff.c b/diff.c
index 6eb2946..7cb9893 100644
--- a/diff.c
+++ b/diff.c
@@ -2398,7 +2398,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
data->added = count_lines(two->data, two->size);
}
- else {
+ else if (!data->is_unchanged) {
/* Crazy xdl interfaces.. */
xpparam_t xpp;
xdemitconf_t xecfg;
--
1.7.10.539.g288dd
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