diffcore-break: micro-optimize by avoiding delta between identical files.

We did not check if we have the same file on both sides when
computing break score.  This is usually not a problem, but if
the user said --find-copies-harde with -B, we ended up trying a
delta between the same data even when we know the SHA1 hash of
both sides match.

Signed-off-by: Junio C Hamano <junkio@cox.net>
(cherry picked from aeecd23ae2785a0462d42191974e9d9a8e439fbe commit)

diff --git a/diffcore-break.c b/diffcore-break.c
index c57513a..95b5eb4 100644 (file)
--- a/diffcore-break.c
+++ b/diffcore-break.c
@@ -58,6 +58,10 @@ static int should_break(struct diff_filespec *src,
        if (!S_ISREG(src->mode) || !S_ISREG(dst->mode))
                return 0; /* leave symlink rename alone */
 
+       if (src->sha1_valid && dst->sha1_valid &&
+           !memcmp(src->sha1, dst->sha1, 20))
+               return 0; /* they are the same */
+
        if (diff_populate_filespec(src, 0) || diff_populate_filespec(dst, 0))
                return 0; /* error but caught downstream */