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[ot-tags] Further gate the slow complex case, and add more tests 

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

Still 'zh-trad' is the slowest case.

--------------------------------------------------------------------------------------------------
Benchmark                                                        Time             CPU   Iterations
--------------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON zh_trad          136 ns          136 ns      5107838
BM_hb_ot_tags_from_script_and_language/COMMON ab_abcd          115 ns          115 ns      6103104
BM_hb_ot_tags_from_script_and_language/COMMON ab_abc          25.4 ns         25.3 ns     27674482
BM_hb_ot_tags_from_script_and_language/COMMON abcdef_XY       20.2 ns         20.1 ns     34795719
BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY         19.4 ns         19.3 ns     36390401
BM_hb_ot_tags_from_script_and_language/COMMON cxy_CN          33.5 ns         33.4 ns     20998939
BM_hb_ot_tags_from_script_and_language/COMMON exy_CN          25.1 ns         25.0 ns     27705832
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN           34.2 ns         34.1 ns     20564356
BM_hb_ot_tags_from_script_and_language/COMMON en_US           15.5 ns         15.5 ns     45032204
BM_hb_ot_tags_from_script_and_language/LATIN en_US            15.9 ns         15.8 ns     44412379
BM_hb_ot_tags_from_script_and_language/COMMON none            4.72 ns         4.71 ns    149101665
BM_hb_ot_tags_from_script_and_language/LATIN none             4.72 ns         4.70 ns    149254498
This commit is contained in:
Behdad Esfahbod 2022-05-18 11:04:52 -06:00
parent 9c64bda21d
commit f5d619be79
3 changed files with 9 additions and 0 deletions
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3
perf/benchmark-ot.cc
View File

@ -27,6 +27,9 @@ static void BM_hb_ot_tags_from_script_and_language (benchmark::State& state,
language_tags /* OUT */);
}
}
BENCHMARK_CAPTURE (BM_hb_ot_tags_from_script_and_language, COMMON zh_trad, HB_SCRIPT_COMMON, "zh_trad");
BENCHMARK_CAPTURE (BM_hb_ot_tags_from_script_and_language, COMMON ab_abcd, HB_SCRIPT_COMMON, "ab_abcd");
BENCHMARK_CAPTURE (BM_hb_ot_tags_from_script_and_language, COMMON ab_abc, HB_SCRIPT_COMMON, "ab_abc");
BENCHMARK_CAPTURE (BM_hb_ot_tags_from_script_and_language, COMMON abcdef_XY, HB_SCRIPT_COMMON, "abcdef_XY");
BENCHMARK_CAPTURE (BM_hb_ot_tags_from_script_and_language, COMMON abcd_XY, HB_SCRIPT_COMMON, "abcd_XY");
BENCHMARK_CAPTURE (BM_hb_ot_tags_from_script_and_language, COMMON cxy_CN, HB_SCRIPT_COMMON, "cxy_CN");

3
src/gen-tag-table.py
View File

@ -1028,6 +1028,8 @@ min_subtag_len += 1 # For initial '-'
print (' if (limit - lang_str > %d ||' % min_subtag_len)
print (" (limit - lang_str == %d && *lang_str == '-'))" % min_subtag_len)
print (' {')
print (" const char *p = strchr (lang_str, '-');")
print (" if (!p || p >= limit || limit - p < %i) goto out;" % min_subtag_len)
for initial, items in sorted (complex_tags.items ()):
if initial != 'und':
continue
@ -1061,6 +1063,7 @@ for initial, items in sorted (complex_tags.items ()):
print (' return true;')
print (' }')
print (' }')
print ('out:')
print (' switch (lang_str[0])')
print (' {')

3
src/hb-ot-tag-table.hh
View File

@ -1645,6 +1645,8 @@ hb_ot_tags_from_complex_language (const char *lang_str,
if (limit - lang_str > 5 ||
(limit - lang_str == 5 && *lang_str == '-'))
{
const char *p = strchr (lang_str, '-');
if (!p || p >= limit || limit - p < 5) goto out;
if (subtag_matches (lang_str, limit, "-fonnapa", 8))
{
/* Undetermined; North American Phonetic Alphabet */
@ -1709,6 +1711,7 @@ hb_ot_tags_from_complex_language (const char *lang_str,
return true;
}
}
out:
switch (lang_str[0])
{
case 'a':