vtmp-0001-fastpath.patch
text/x-patch
Filename: vtmp-0001-fastpath.patch
Type: text/x-patch
Part: 0
Patch
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API reference →
Format: format-patch
Series: patch 0001
Subject: fastpath
| File | + | − |
|---|---|---|
| src/common/unicode_case.c | 32 | 2 |
From ed4d2803aa32add7c05726286b94e78e49bb1257 Mon Sep 17 00:00:00 2001
From: Jeff Davis <jeff@j-davis.com>
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