in_merge_bases(): use paint_down_to_common()

With paint_down_to_common(), we can tell if "commit" is reachable
from "reference" by simply looking at its object flag, instead of
iterating over the merge bases.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/commit.c b/commit.c
index 0058fa5b4365d290ccdb0ed64f6a23eb6f195527..d39a9e96937d1d6f7e2932fe12729c25896b2977 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -786,20 +786,17 @@ int is_descendant_of(struct commit *commit, struct commit_list *with_commit)
  */
 int in_merge_bases(struct commit *commit, struct commit *reference)
 {
-       struct commit_list *bases, *b;
+       struct commit_list *bases;
        int ret = 0;
 
-       bases = merge_bases_many(commit, 1, &reference);
+       if (parse_commit(commit) || parse_commit(reference))
+               return ret;
+
+       bases = paint_down_to_common(commit, 1, &reference);
+       if (commit->object.flags & PARENT2)
+               ret = 1;
        clear_commit_marks(commit, all_flags);
        clear_commit_marks(reference, all_flags);
-
-       for (b = bases; b; b = b->next) {
-               if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
-                       ret = 1;
-                       break;
-               }
-       }
-
        free_commit_list(bases);
        return ret;
 }