From 74e439baeebe4ea17de729bb5cb8a9e815949e7e Mon Sep 17 00:00:00 2001
From: lizhihong <lizhihong16@huawei.com>
Date: Wed, 21 May 2025 19:21:50 +0800
Subject: [PATCH] Optimize checksum compute

Signed-off-by: lizhihong <lizhihong16@huawei.com>
---
 patch/0007-Optimize-checksum-compute.patch    | 118 ++++++++++++++++++
 ...on.patch => 0008-BugFix-CurrVersion.patch} |   0
 2 files changed, 118 insertions(+)
 create mode 100644 patch/0007-Optimize-checksum-compute.patch
 rename patch/{0007-BugFix-CurrVersion.patch => 0008-BugFix-CurrVersion.patch} (100%)

diff --git a/patch/0007-Optimize-checksum-compute.patch b/patch/0007-Optimize-checksum-compute.patch
new file mode 100644
index 0000000..5859d52
--- /dev/null
+++ b/patch/0007-Optimize-checksum-compute.patch
@@ -0,0 +1,118 @@
+From 495dc4bf6cfb38379214023cad93c138d9753432 Mon Sep 17 00:00:00 2001
+From: lizhihong <lizhihong16@huawei.com>
+Date: Wed, 21 May 2025 19:16:28 +0800
+Subject: [PATCH] Optimize checksum compute
+
+Signed-off-by: lizhihong <lizhihong16@huawei.com>
+---
+ ext/misc/cksumvfs.c | 80 ++++++++++++++++++++++++++++++++++++++++++---
+ 1 file changed, 76 insertions(+), 4 deletions(-)
+
+diff --git a/ext/misc/cksumvfs.c b/ext/misc/cksumvfs.c
+index 6f4c55c..51cd006 100644
+--- a/ext/misc/cksumvfs.c
++++ b/ext/misc/cksumvfs.c
+@@ -193,6 +193,7 @@ typedef struct CksmFile CksmFile;
+   typedef unsigned char u8;
+   typedef unsigned int u32;
+ #endif
++typedef sqlite3_uint64 u64;
+ 
+ /* Access to a lower-level VFS that (might) implement dynamic loading,
+ ** access to randomness, etc.
+@@ -307,6 +308,79 @@ static const sqlite3_io_methods cksm_io_methods = {
+   + (((x)&0x00FF0000)>>8)  + (((x)&0xFF000000)>>24) \
+ )
+ 
++uint64_t cksmComputeDeepFastLE(void *src, int srcLen){
++  u32 s1 = 0, s2 = 0;
++  u32 s3 = 0, s4 = 0;
++  u32 s5 = 0, s6 = 0;
++  u32 s7 = 0, s8 = 0;
++  u32 *aData = (u32*)src;
++  u32 *aEnd = aData + srcLen/4;
++  u64 aOut;
++  u8 *u8p_aOut = (u8*)&aOut;
++  while( aData + 32 <= aEnd ){
++    s1 += *aData++ + s2;
++    s2 += *aData++ + s1;
++    s1 += *aData++ + s2;
++    s2 += *aData++ + s1;
++    s1 += *aData++ + s2;
++    s2 += *aData++ + s1;
++    s1 += *aData++ + s2;
++    s2 += *aData++ + s1;
++
++    s3 += *aData++ + s4;
++    s4 += *aData++ + s3;
++    s3 += *aData++ + s4;
++    s4 += *aData++ + s3;
++    s3 += *aData++ + s4;
++    s4 += *aData++ + s3;
++    s3 += *aData++ + s4;
++    s4 += *aData++ + s3;
++
++    s5 += *aData++ + s6;
++    s6 += *aData++ + s5;
++    s5 += *aData++ + s6;
++    s6 += *aData++ + s5;
++    s5 += *aData++ + s6;
++    s6 += *aData++ + s5;
++    s5 += *aData++ + s6;
++    s6 += *aData++ + s5;
++
++    s7 += *aData++ + s8;
++    s8 += *aData++ + s7;
++    s7 += *aData++ + s8;
++    s8 += *aData++ + s7;
++    s7 += *aData++ + s8;
++    s8 += *aData++ + s7;
++    s7 += *aData++ + s8;
++    s8 += *aData++ + s7;
++
++    s3 += 13*s1 + 21*s2;
++    s4 += 21*s1 + 34*s2;
++
++    s5 += 13*s3 + 21*s4;
++    s6 += 21*s3 + 34*s4;
++
++    s7 += 13*s5 + 21*s6;
++    s8 += 21*s5 + 34*s6;
++
++    s1 = s7;
++    s2 = s8;
++    s3 = 0;
++    s4 = 0;
++    s5 = 0;
++    s6 = 0;
++    s7 = 0;
++    s8 = 0;
++  }
++  while( aData < aEnd ){
++    s1 = *aData++ + s1 + s2;
++    s2 = *aData++ + s1 + s2;
++  }
++  memcpy(u8p_aOut, &s1, 4);
++  memcpy(u8p_aOut + 4, &s2, 4);
++  return aOut;
++}
++
+ /* Compute a checksum on a buffer */
+ static void cksmCompute(
+   u8 *a,           /* Content to be checksummed */
+@@ -324,10 +398,8 @@ static void cksmCompute(
+ 
+   if( 1 == *(u8*)&x ){
+     /* Little-endian */
+-    do {
+-      s1 += *aData++ + s2;
+-      s2 += *aData++ + s1;
+-    }while( aData<aEnd );
++    *(u64*)aOut = cksmComputeDeepFastLE(a, nByte);
++    return;
+   }else{
+     /* Big-endian */
+     do {
+-- 
+2.47.0.windows.2
+
diff --git a/patch/0007-BugFix-CurrVersion.patch b/patch/0008-BugFix-CurrVersion.patch
similarity index 100%
rename from patch/0007-BugFix-CurrVersion.patch
rename to patch/0008-BugFix-CurrVersion.patch
-- 
Gitee