v17-0003-First-attempt-at-addressing-performance-regressi.patch
application/octet-stream
Filename: v17-0003-First-attempt-at-addressing-performance-regressi.patch
Type: application/octet-stream
Part: 3
Message:
Re: speed up verifying UTF-8
Patch
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API reference →
Format: format-patch
Series: patch v17-0003
Subject: First attempt at addressing performance regressions from chunk approach
| File | + | − |
|---|---|---|
| src/common/wchar.c | 8 | 0 |
From 340dbdb625425a4018e51a3bd5d91b54044be4c0 Mon Sep 17 00:00:00 2001
From: John Naylor <john.naylor@2ndquadrant.com>
Date: Fri, 16 Jul 2021 17:41:10 -0400
Subject: [PATCH v17 3/4] First attempt at addressing performance regressions
from chunk approach
---
src/common/wchar.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/src/common/wchar.c b/src/common/wchar.c
index 84cc1c6785..79990fe972 100644
--- a/src/common/wchar.c
+++ b/src/common/wchar.c
@@ -1877,6 +1877,14 @@ pg_utf8_verifystr(const unsigned char *s, int len)
continue;
}
+ /* Do a quick check if the first byte is both non-zero and doesn't have the high bit set */
+ if ((signed char) (*s) > 0)
+ {
+ s++;
+ len--;
+ continue;
+ }
+
/*
* Found non-ASCII or zero above, so verify a single character.
*/
--
2.31.1