v11-0008-Optimize-loading-tail-when-4-bytes.patch
application/x-patch
Filename: v11-0008-Optimize-loading-tail-when-4-bytes.patch
Type: application/x-patch
Part: 3
Patch
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Format: format-patch
Series: patch v11-0008
Subject: Optimize loading tail when >= 4 bytes
| File | + | − |
|---|---|---|
| src/include/common/hashfn_unstable.h | 5 | 2 |
From 59c7f7933b7cf65222bda047f2cf915fdae8b5fd Mon Sep 17 00:00:00 2001
From: John Naylor <john.naylor@postgresql.org>
Date: Tue, 26 Dec 2023 13:10:26 +0700
Subject: [PATCH v11 8/8] Optimize loading tail when >= 4 bytes
---
src/include/common/hashfn_unstable.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/src/include/common/hashfn_unstable.h b/src/include/common/hashfn_unstable.h
index 5bc1fc88ec..79defbfeb5 100644
--- a/src/include/common/hashfn_unstable.h
+++ b/src/include/common/hashfn_unstable.h
@@ -113,6 +113,8 @@ fasthash_combine(fasthash_state *hs)
static inline void
fasthash_accum(fasthash_state *hs, const char *k, int len)
{
+ uint32 lower_four;
+
Assert(hs->accum == 0);
Assert(len <= FH_SIZEOF_ACCUM);
@@ -131,8 +133,9 @@ fasthash_accum(fasthash_state *hs, const char *k, int len)
hs->accum |= (uint64) k[4] << 32;
/* FALLTHROUGH */
case 4:
- hs->accum |= (uint64) k[3] << 24;
- /* FALLTHROUGH */
+ memcpy(&lower_four, k, sizeof(lower_four));
+ hs->accum |= lower_four;
+ break;
case 3:
hs->accum |= (uint64) k[2] << 16;
/* FALLTHROUGH */
--
2.43.0