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f3210cbf
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2023-05-15T14:23:16
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compose: drop the 65535 node limit (#343)
In commit 1638409b22aef33d487863876ab214b949db4984, the number of
compose nodes was limited to 65535 to enable "future optimizations",
which apparently means slightly reduced memory usage due to fitting in
a uint16_t. At this time, it was mentioned that the author was not
aware of "any compose files which come close".
However, I'm one of the users that actually do require a larger number
of nodes for their compose file. Thus, use a uint32_t again and raise
the limit significantly.
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02b9cabf
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2021-03-29T16:05:14
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compose: use a ternary tree instead of a regular trie
Previously we used a simple trie with a linked list for each chain.
Unfortunately most compose files have very long chains which means the
constructions performs an almost quadratic number of comparisons.
Switch to using a ternary search tree instead. This is very similar to a
trie, only the linked list is essentially replaced with a binary tree.
On the en_US/Compose file, the perf diff is the following (the modified
function is `parse`):
Event 'cycles:u'
Baseline Delta Abs Shared Object Symbol
........ ......... ................ .................................
39.91% -17.62% bench-compose [.] parse.constprop.0
20.54% +6.47% bench-compose [.] lex
17.28% +5.55% libc-2.33.so [.] __strcmp_avx2
12.78% +4.01% bench-compose [.] xkb_keysym_from_name
2.30% +0.83% libc-2.33.so [.] __GI_____strtoull_l_internal
3.36% +0.78% bench-compose [.] strcmp@plt
Thanks to some careful packing, the memory usage is pretty much the
same.
Signed-off-by: Ran Benita <ran@unusedvar.com>
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8b09e177
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2021-03-30T20:12:08
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compose: use anonymous union
Signed-off-by: Ran Benita <ran@unusedvar.com>
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1638409b
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2021-03-30T17:52:36
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compose: add a limit of 65535 sequences
Fits in uint16_t, which enables some future optimizations. But also a
good idea to have some limit. Not aware of any compose files which come
close.
Signed-off-by: Ran Benita <ran@unusedvar.com>
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edc98b54
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2014-09-12T18:44:30
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compose: add xkbcommon-compose - implementation
Signed-off-by: Ran Benita <ran234@gmail.com>
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