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Hash : dd3c858f
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Date : 2022-05-17T14:28:28

[ot-tags] Speed up hb_ot_tags_from_language()

Part of https://github.com/harfbuzz/harfbuzz/issues/3591

"After that, bulk of the time I suppose is spent in binary-searching the
language table. I suggest we split the language table in 2-letter and
3-letter tags, to speed-up the vast majority of cases that are
2-letter."

benchmark-ot, before:

----------------------------------------------------------------------------------------------
Benchmark                                                    Time             CPU   Iterations
----------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN        112 ns          111 ns      6286271
BM_hb_ot_tags_from_script_and_language/COMMON en_US       60.6 ns         60.4 ns     11671176
BM_hb_ot_tags_from_script_and_language/LATIN en_US        61.3 ns         61.1 ns     11442645
BM_hb_ot_tags_from_script_and_language/COMMON none        4.75 ns         4.74 ns    146997235
BM_hb_ot_tags_from_script_and_language/LATIN none         4.65 ns         4.64 ns    150938747

After:

----------------------------------------------------------------------------------------------
Benchmark                                                    Time             CPU   Iterations
----------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN       89.5 ns         89.2 ns      7747649
BM_hb_ot_tags_from_script_and_language/COMMON en_US       38.5 ns         38.4 ns     18199432
BM_hb_ot_tags_from_script_and_language/LATIN en_US        39.0 ns         38.9 ns     18049238
BM_hb_ot_tags_from_script_and_language/COMMON none        4.53 ns         4.52 ns    154895110
BM_hb_ot_tags_from_script_and_language/LATIN none         4.54 ns         4.52 ns    154762105

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