From ed4d2803aa32add7c05726286b94e78e49bb1257 Mon Sep 17 00:00:00 2001 From: Jeff Davis Date: Wed, 12 Mar 2025 11:56:59 -0700 Subject: [PATCH vtmp] fastpath --- src/common/unicode_case.c | 34 ++++++++++++++++++++++++++++++++-- 1 file changed, 32 insertions(+), 2 deletions(-) diff --git a/src/common/unicode_case.c b/src/common/unicode_case.c index 2b3b4cdc2e7..b1fc1651043 100644 --- a/src/common/unicode_case.c +++ b/src/common/unicode_case.c @@ -390,11 +390,41 @@ casemap(pg_wchar u1, CaseKind casekind, bool full, { const pg_case_map *map; + /* + * Fast path for early codepoints. The only interesting characters are + * [a-zA-Z]. + */ if (u1 < 0x80) { - *simple = case_map[u1].simplemap[casekind]; + /* fast-path codepoints do not have special casing */ + Assert(find_case_map(u1)->special_case == NULL); - return CASEMAP_SIMPLE; + switch (casekind) + { + case CaseLower: + case CaseFold: + if (u1 >= 'A' && u1 <= 'Z') + { + *simple = u1 + 0x20; + Assert(case_map[u1].simplemap[casekind] == *simple); + return CASEMAP_SIMPLE; + } + break; + case CaseTitle: + case CaseUpper: + if (u1 >= 'a' && u1 <= 'z') + { + *simple = u1 - 0x20; + Assert(case_map[u1].simplemap[casekind] == *simple); + return CASEMAP_SIMPLE; + } + break; + default: + Assert(false); + } + + Assert(case_map[u1].simplemap[casekind] == u1); + return CASEMAP_SELF; } map = find_case_map(u1); -- 2.34.1