SQLite

Check-in [adf9fefb00]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Performance improvement in sqlite3VarintLen().
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: adf9fefb00ae1dbb07a921c6796cb0a9505c6d19
User & Date: drh 2015-09-01 22:29:07.506
Context
2015-09-01
23:51
Very minor optimizations in the unix VFS. (check-in: 6db3ff45bc user: drh tags: trunk)
22:29
Performance improvement in sqlite3VarintLen(). (check-in: adf9fefb00 user: drh tags: trunk)
20:09
Small size reduction and performance increase in sqlite3DbMallocSize(). (check-in: 8a80967f84 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/util.c.
︙︙
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079

}

/*
** Return the number of bytes that will be needed to store the given
** 64-bit integer.
*/
int sqlite3VarintLen(u64 v){
  int i = 0;
  do{
    i++;
    v >>= 7;
  }while( v!=0 && ALWAYS(i<9) );
  return i;
}


/*
** Read or write a four-byte big-endian integer value.
*/








|
<
<
|
<








1061
1062
1063
1064
1065
1066
1067
1068


1069

1070
1071
1072
1073
1074
1075
1076

}

/*
** Return the number of bytes that will be needed to store the given
** 64-bit integer.
*/
int sqlite3VarintLen(u64 v){
  int i;


  for(i=1; (v >>= 7)!=0; i++){ assert( i<9 ); }

  return i;
}


/*
** Read or write a four-byte big-endian integer value.
*/
︙︙