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Merge branch 'jk/revision-pruning-optim'

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Pathspec-limited revision traversal was taught not to keep finding
unneeded differences once it knows two trees are different inside
given pathspec.

* jk/revision-pruning-optim:
  revision: quit pruning diff more quickly when possible
This commit is contained in:
Junio C Hamano 2017-11-06 14:24:26 +09:00
commit f4c214b529
2 changed files with 14 additions and 3 deletions
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1
diff.h
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@ -180,6 +180,7 @@ struct diff_options {
pathchange_fn_t pathchange;
change_fn_t change;
add_remove_fn_t add_remove;
void *change_fn_data;
diff_format_fn_t format_callback;
void *format_callback_data;
diff_prefix_fn_t output_prefix;

16
revision.c
View File

@ -395,8 +395,16 @@ static struct commit *one_relevant_parent(const struct rev_info *revs,
* if the whole diff is removal of old data, and otherwise
* REV_TREE_DIFFERENT (of course if the trees are the same we
* want REV_TREE_SAME).
* That means that once we get to REV_TREE_DIFFERENT, we do not
* have to look any further.
*
* The only time we care about the distinction is when
* remove_empty_trees is in effect, in which case we care only about
* whether the whole change is REV_TREE_NEW, or if there's another type
* of change. Which means we can stop the diff early in either of these
* cases:
*
* 1. We're not using remove_empty_trees at all.
*
* 2. We saw anything except REV_TREE_NEW.
*/
static int tree_difference = REV_TREE_SAME;
@ -407,9 +415,10 @@ static void file_add_remove(struct diff_options *options,
const char *fullpath, unsigned dirty_submodule)
{
int diff = addremove == '+' ? REV_TREE_NEW : REV_TREE_OLD;
struct rev_info *revs = options->change_fn_data;
tree_difference |= diff;
if (tree_difference == REV_TREE_DIFFERENT)
if (!revs->remove_empty_trees || tree_difference != REV_TREE_NEW)
DIFF_OPT_SET(options, HAS_CHANGES);
}
@ -1407,6 +1416,7 @@ void init_revisions(struct rev_info *revs, const char *prefix)
DIFF_OPT_SET(&revs->pruning, QUICK);
revs->pruning.add_remove = file_add_remove;
revs->pruning.change = file_change;
revs->pruning.change_fn_data = revs;
revs->sort_order = REV_SORT_IN_GRAPH_ORDER;
revs->dense = 1;
revs->prefix = prefix;