v7-0011-Add-abiliy-to-case-fold-with-chunk-8-byte-interfa.patch
text/x-patch
Filename: v7-0011-Add-abiliy-to-case-fold-with-chunk-8-byte-interfa.patch
Type: text/x-patch
Part: 0
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Format: format-patch
Series: patch v7-0011
Subject: Add abiliy to case-fold with chunk (8-byte) interface
| File | + | − |
|---|---|---|
| src/include/common/hashfn_unstable.h | 8 | 2 |
From b1c63cddb988b6086486cfb739c07d33d872cafe Mon Sep 17 00:00:00 2001
From: John Naylor <john.naylor@postgresql.org>
Date: Sat, 9 Dec 2023 17:58:59 +0700
Subject: [PATCH v7 11/13] Add abiliy to case-fold with chunk (8-byte)
interface
---
src/include/common/hashfn_unstable.h | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/src/include/common/hashfn_unstable.h b/src/include/common/hashfn_unstable.h
index a798c42ba7..6157124cb4 100644
--- a/src/include/common/hashfn_unstable.h
+++ b/src/include/common/hashfn_unstable.h
@@ -49,6 +49,7 @@ typedef struct fasthash_state
{
uint64 accum;
#define FH_SIZEOF_ACCUM sizeof(uint64)
+ uint64 overlay; /* used for case-folding */
int8 accum_len;
uint64 hash;
} fasthash_state;
@@ -74,7 +75,7 @@ fasthash_combine(fasthash_state* hs)
}
static inline void
-fasthash_init(fasthash_state *hs, int len, uint64 seed)
+fasthash_init(fasthash_state *hs, int len, uint64 seed, bool case_fold)
{
memset(hs, 0, sizeof(fasthash_state));
@@ -82,6 +83,9 @@ fasthash_init(fasthash_state *hs, int len, uint64 seed)
// handle some other way -- maybe we can accum the length in
// the state and fold it in during the finalizer (cf. xxHash3)
hs->hash = seed ^ (len * UINT64CONST(0x880355f21e6d1965));
+
+ if (case_fold)
+ hs->overlay = UINT64CONST(0x2020202020202020);
}
static inline void
@@ -123,6 +127,8 @@ fasthash_accum(fasthash_state *hs, const unsigned char *k, int len)
case 0:
return;
}
+ /* case-fold, if set */
+ hs->accum |= hs->overlay;
fasthash_combine(hs);
}
@@ -154,7 +160,7 @@ fasthash64(const unsigned char * k, int len, uint64 seed)
{
fasthash_state hs;
- fasthash_init(&hs, len, seed);
+ fasthash_init(&hs, len, seed, false);
while (len >= FH_SIZEOF_ACCUM)
{
--
2.43.0