From 39f75d26e235798681394e46625716c187a4ee3e Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Fri, 13 Aug 2010 10:36:01 -0700 Subject: [PATCH] diff --follow: do not waste cycles while recursing The "--follow" logic is called from diff_tree_sha1() function, but the input trees to diff_tree_sha1() are not necessarily the top-level trees (compare_tree_entry() calls it while it recursively descends into subtrees). When a newly created path lives in somewhere deep in the source hierarchy, e.g. "platform/", but the rename source is in a totally different place in the destination hierarchy, e.g. "lang-api/src/com/...", running "try_to_find_renames()" while base is set to "platform/" is a wasted call. We only need to run the rename following at the very top level. Signed-off-by: Junio C Hamano Acked-by: Linus Torvalds --- tree-diff.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tree-diff.c b/tree-diff.c index 1fb3e9461..5b68c0864 100644 --- a/tree-diff.c +++ b/tree-diff.c @@ -412,7 +412,7 @@ int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const cha init_tree_desc(&t1, tree1, size1); init_tree_desc(&t2, tree2, size2); retval = diff_tree(&t1, &t2, base, opt); - if (DIFF_OPT_TST(opt, FOLLOW_RENAMES) && diff_might_be_rename()) { + if (!*base && DIFF_OPT_TST(opt, FOLLOW_RENAMES) && diff_might_be_rename()) { init_tree_desc(&t1, tree1, size1); init_tree_desc(&t2, tree2, size2); try_to_follow_renames(&t1, &t2, base, opt); -- 2.26.2