diff options
| -rw-r--r-- | Documentation/config/diff.txt | 7 | ||||
| -rw-r--r-- | Documentation/config/merge.txt | 10 | ||||
| -rw-r--r-- | Documentation/diff-options.txt | 16 | ||||
| -rw-r--r-- | diff.c | 4 | ||||
| -rw-r--r-- | diffcore-rename.c | 2 | ||||
| -rw-r--r-- | merge-ort.c | 2 | ||||
| -rw-r--r-- | merge-recursive.c | 2 |
7 files changed, 26 insertions, 17 deletions
diff --git a/Documentation/config/diff.txt b/Documentation/config/diff.txt index 2d3331f55c..32f84838ac 100644 --- a/Documentation/config/diff.txt +++ b/Documentation/config/diff.txt @@ -118,9 +118,10 @@ diff.orderFile:: relative to the top of the working tree. diff.renameLimit:: - The number of files to consider when performing the copy/rename - detection; equivalent to the 'git diff' option `-l`. This setting - has no effect if rename detection is turned off. + The number of files to consider in the exhaustive portion of + copy/rename detection; equivalent to the 'git diff' option + `-l`. If not set, the default value is currently 1000. This + setting has no effect if rename detection is turned off. diff.renames:: Whether and how Git detects renames. If set to "false", diff --git a/Documentation/config/merge.txt b/Documentation/config/merge.txt index 6b66c83eab..e27cc63944 100644 --- a/Documentation/config/merge.txt +++ b/Documentation/config/merge.txt @@ -33,10 +33,12 @@ merge.verifySignatures:: include::fmt-merge-msg.txt[] merge.renameLimit:: - The number of files to consider when performing rename detection - during a merge; if not specified, defaults to the value of - diff.renameLimit. This setting has no effect if rename detection - is turned off. + The number of files to consider in the exhaustive portion of + rename detection during a merge. If not specified, defaults + to the value of diff.renameLimit. If neither + merge.renameLimit nor diff.renameLimit are specified, + currently defaults to 7000. This setting has no effect if + rename detection is turned off. merge.renames:: Whether Git detects renames. If set to "false", rename detection diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt index 32e6dee5ac..0aebe83205 100644 --- a/Documentation/diff-options.txt +++ b/Documentation/diff-options.txt @@ -588,11 +588,17 @@ When used together with `-B`, omit also the preimage in the deletion part of a delete/create pair. -l<num>:: - The `-M` and `-C` options require O(n^2) processing time where n - is the number of potential rename/copy targets. This - option prevents rename/copy detection from running if - the number of rename/copy targets exceeds the specified - number. + The `-M` and `-C` options involve some preliminary steps that + can detect subsets of renames/copies cheaply, followed by an + exhaustive fallback portion that compares all remaining + unpaired destinations to all relevant sources. (For renames, + only remaining unpaired sources are relevant; for copies, all + original sources are relevant.) For N sources and + destinations, this exhaustive check is O(N^2). This option + prevents the exhaustive portion of rename/copy detection from + running if the number of source/destination files involved + exceeds the specified number. Defaults to diff.renameLimit. + Note that a value of 0 is treated as unlimited. ifndef::git-format-patch[] --diff-filter=[(A|C|D|M|R|T|U|X|B)...[*]]:: @@ -35,7 +35,7 @@ static int diff_detect_rename_default; static int diff_indent_heuristic = 1; -static int diff_rename_limit_default = 400; +static int diff_rename_limit_default = 1000; static int diff_suppress_blank_empty; static int diff_use_color_default = -1; static int diff_color_moved_default; @@ -6295,7 +6295,7 @@ static int is_summary_empty(const struct diff_queue_struct *q) } static const char rename_limit_warning[] = -N_("inexact rename detection was skipped due to too many files."); +N_("exhaustive rename detection was skipped due to too many files."); static const char degrade_cc_to_c_warning[] = N_("only found copies from modified paths due to too many files."); diff --git a/diffcore-rename.c b/diffcore-rename.c index 4ef0459cfb..2618bb07c1 100644 --- a/diffcore-rename.c +++ b/diffcore-rename.c @@ -1091,7 +1091,7 @@ static int too_many_rename_candidates(int num_destinations, int num_sources, * memory for the matrix anyway. */ if (rename_limit <= 0) - rename_limit = 32767; + return 0; /* treat as unlimited */ if (st_mult(num_destinations, num_sources) <= st_mult(rename_limit, rename_limit)) return 0; diff --git a/merge-ort.c b/merge-ort.c index c3b3ab28c1..ec0c590421 100644 --- a/merge-ort.c +++ b/merge-ort.c @@ -2563,7 +2563,7 @@ static void detect_regular_renames(struct merge_options *opt, diff_opts.detect_rename = DIFF_DETECT_RENAME; diff_opts.rename_limit = opt->rename_limit; if (opt->rename_limit <= 0) - diff_opts.rename_limit = 1000; + diff_opts.rename_limit = 7000; diff_opts.rename_score = opt->rename_score; diff_opts.show_rename_progress = opt->show_rename_progress; diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT; diff --git a/merge-recursive.c b/merge-recursive.c index 03f73cfc47..7008a90df5 100644 --- a/merge-recursive.c +++ b/merge-recursive.c @@ -1880,7 +1880,7 @@ static struct diff_queue_struct *get_diffpairs(struct merge_options *opt, */ if (opts.detect_rename > DIFF_DETECT_RENAME) opts.detect_rename = DIFF_DETECT_RENAME; - opts.rename_limit = (opt->rename_limit >= 0) ? opt->rename_limit : 1000; + opts.rename_limit = (opt->rename_limit >= 0) ? opt->rename_limit : 7000; opts.rename_score = opt->rename_score; opts.show_rename_progress = opt->show_rename_progress; opts.output_format = DIFF_FORMAT_NO_OUTPUT; |