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Hash : 68e69b7d
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Date : 2021-03-28T20:22:54
keysym: use a perfect hash function for case sensitive xkb_keysym_from_name In 7d84809fdccbb5898d0838849ec7c321410182d5 I added a fast path for the case-sensitive case, but it is still slowing down Compose parsing. Instead of the binary search, use a perfect hash function, computed with a simple python module I found (vendored). It is faster -- perf diff is: Baseline Delta Abs Shared Object Symbol ........ ......... ................. ................................... 22.35% -14.04% libc-2.33.so [.] __strcmp_avx2 16.75% +10.28% bench-compose [.] xkb_keysym_from_name 20.72% +2.40% bench-compose [.] parse.constprop.0 2.29% -1.97% bench-compose [.] strcmp@plt 2.56% +1.81% bench-compose [.] resolve_name 2.37% +0.92% libc-2.33.so [.] __GI_____strtoull_l_internal 26.19% -0.63% bench-compose [.] lex 1.45% +0.56% libc-2.33.so [.] __memchr_avx2 1.13% -0.31% libc-2.33.so [.] __strcpy_avx2 Also reduces the binary size: Before: text data bss dec hex filename 341111 5064 8 346183 54847 build/libxkbcommon.so.0.0.0 After: text data bss dec hex filename 330215 5064 8 335287 51db7 build/libxkbcommon.so.0.0.0 Note however that it's still larger than before 7d84809fdccbb5898d08388: text data bss dec hex filename 320617 5168 8 325793 4f8a1 build/libxkbcommon.so.0.0.0 Signed-off-by: Ran Benita <ran@unusedvar.com>
