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merge-ort: resolve paths early when we have sufficient information 

When there are no directories involved at a given path, and all three
sides have a file at that path, and two of the three sides of history
match, we can immediately resolve the merge of that path in
collect_merge_info() and do not need to wait until process_entries().

This is actually a very minor improvement: half the time when I run it,
I see an improvement; the other half a slowdown.  It seems to be in the
range of noise.  However, this idea serves as the beginning of some
bigger optimizations coming in the following patches.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Elijah Newren 2021-07-16 05:22:31 +00:00 committed by Junio C Hamano
parent daab8a564f
commit 785bf2088e
1 changed files with 37 additions and 0 deletions
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37
merge-ort.c
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@ -1023,6 +1023,43 @@ static int collect_merge_info_callback(int n,
return mask;
}

/*
* If the sides match, and all three paths are present and are
* files, then we can take either as the resolution. We can't do
* this with trees, because there may be rename sources from the
* merge_base.
*/
if (sides_match && filemask == 0x07) {
/* use side1 (== side2) version as resolution */
setup_path_info(opt, &pi, dirname, info->pathlen, fullpath,
names, names+1, side1_null, 0,
filemask, dirmask, 1);
return mask;
}

/*
* If side1 matches mbase and all three paths are present and are
* files, then we can use side2 as the resolution. We cannot
* necessarily do so this for trees, because there may be rename
* destinations within side2.
*/
if (side1_matches_mbase && filemask == 0x07) {
/* use side2 version as resolution */
setup_path_info(opt, &pi, dirname, info->pathlen, fullpath,
names, names+2, side2_null, 0,
filemask, dirmask, 1);
return mask;
}

/* Similar to above but swapping sides 1 and 2 */
if (side2_matches_mbase && filemask == 0x07) {
/* use side1 version as resolution */
setup_path_info(opt, &pi, dirname, info->pathlen, fullpath,
names, names+1, side1_null, 0,
filemask, dirmask, 1);
return mask;
}

/*
* Gather additional information used in rename detection.
*/