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Cleanup: Avoid recheck span part if is already confirmed range #108284

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Iliya Katushenock wants to merge 3 commits from mod_moder:tmp_avoid_rechecking_already_confirmed_range into main
pull from: mod_moder:tmp_avoid_rechecking_already_confirmed_range
merge into: blender:main

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Conversation 2 Commits 3 Files Changed 2 +20 -10
Iliya Katushenock commented 2023-05-25 18:08:59 +02:00
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We already know if range_threshold-size part of span
start is range. Complexity find_size_of_next_range depend
on span size, better to avoid checking of first part if it is definetly range.

We already know if `range_threshold`-size part of span start is range. Complexity `find_size_of_next_range` depend on span size, better to avoid checking of first part if it is definetly range.
Iliya Katushenock added 1 commit 2023-05-25 18:09:09 +02:00
Iliya Katushenock commented 2023-05-25 18:09:21 +02:00
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As i can see, range_threshold can be << than remaining_indices.size().
This mean, non_empty_as_range_try can fail, but non_empty_is_range(remaining_indices.take_front(range_threshold))
can be true multiple time in sequence. It would be better to use bisect lookup of end of this range, or just call ^ in loop.
Also it possible to added slice(range_threshold) as individual range each time in the main while loop.

As i can see, `range_threshold` can be << than `remaining_indices.size()`. This mean, `non_empty_as_range_try` can fail, but `non_empty_is_range(remaining_indices.take_front(range_threshold))` can be true multiple time in sequence. It would be better to use bisect lookup of end of this range, or just call ^ in loop. Also it possible to added `slice(range_threshold)` as individual range each time in the main while loop.
Iliya Katushenock requested review from Jacques Lucke 2023-05-25 18:09:30 +02:00
Jacques Lucke reviewed 2023-05-25 18:13:42 +02:00
source/blender/blenlib/BLI_unique_sorted_indices.hh
@ -130,2 +130,4 @@
if (non_empty_is_range(remaining_indices.take_front(range_threshold))) {
/* Next segment is a range. Now find the place where the range ends. */
const T segment_start = remaining_indices.first();
remaining_indices = remaining_indices.drop_front(range_threshold);
Jacques Lucke commented 2023-05-25 18:13:42 +02:00
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Generally seems reasonable to not check those indices again. Didn't test this yet, but it seems like the segment_size computed below is now too small. range_threshold has to be added to it, no?

Generally seems reasonable to not check those indices again. Didn't test this yet, but it seems like the `segment_size` computed below is now too small. `range_threshold` has to be added to it, no?
😆 1
Iliya Katushenock commented 2023-05-25 18:15:40 +02:00
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Op, yes, forgot!

Op, yes, forgot!
mod_moder marked this conversation as resolved
Iliya Katushenock added 1 commit 2023-05-25 18:16:37 +02:00
Iliya Katushenock added 1 commit 2023-05-25 18:28:36 +02:00
Jacques Lucke reviewed 2023-05-25 18:29:58 +02:00
source/blender/blenlib/tests/BLI_unique_sorted_indices_test.cc
@ -52,3 +52,1 @@
Array<int> data = {1, 2, 3, 4, 7, 9, 10, 13, 14, 15, 20, 21, 22, 23, 24};
Vector<std::variant<IndexRange, Span<int>>> parts;
const int64_t parts_num = split_to_ranges_and_spans<int>(data, 3, parts);
Array<int> data_1 = {1, 2, 3, 4, 7, 9, 10, 13, 14, 15, 20, 21, 22, 23, 24};
Jacques Lucke commented 2023-05-25 18:29:58 +02:00
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Instead of naming variables _1 and _2 you can simply create a nested { ... } block for each test case.

Instead of naming variables `_1` and `_2` you can simply create a nested `{ ... }` block for each test case.
Iliya Katushenock commented 2023-05-25 19:55:23 +02:00
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Found a problem in my approach. Later I will make the version described in the comment above.

Found a problem in my approach. Later I will make the version described in the comment above.
Iliya Katushenock deleted branch tmp_avoid_rechecking_already_confirmed_range 2023-05-25 19:55:34 +02:00

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