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Performance enhancement in sqlite3PutVarint().

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FossilOrigin-Name: a929be551924144c9bc7aab608404d59e479abb5
This commit is contained in:
drh
2014-08-22 18:48:25 +00:00
parent 13f40da31d
commit 2f2b2b8580
5 changed files with 23 additions and 49 deletions
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27
src/util.c
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@@ -708,7 +708,7 @@ int sqlite3Atoi(const char *z){
** bit clear. Except, if we get to the 9th byte, it stores the full
** 8 bits and is the last byte.
*/
int sqlite3PutVarint(unsigned char *p, u64 v){
static int SQLITE_NOINLINE putVarint64(unsigned char *p, u64 v){
int i, j, n;
u8 buf[10];
if( v & (((u64)0xff000000)<<32) ){
@@ -732,28 +732,17 @@ int sqlite3PutVarint(unsigned char *p, u64 v){
}
return n;
}
/*
** This routine is a faster version of sqlite3PutVarint() that only
** works for 32-bit positive integers and which is optimized for
** the common case of small integers. A MACRO version, putVarint32,
** is provided which inlines the single-byte case. All code should use
** the MACRO version as this function assumes the single-byte case has
** already been handled.
*/
int sqlite3PutVarint32(unsigned char *p, u32 v){
#ifndef putVarint32
if( (v & ~0x7f)==0 ){
p[0] = v;
int sqlite3PutVarint(unsigned char *p, u64 v){
if( v<=0x7f ){
p[0] = v&0x7f;
return 1;
}
#endif
if( (v & ~0x3fff)==0 ){
p[0] = (u8)((v>>7) | 0x80);
p[1] = (u8)(v & 0x7f);
if( v<=0x3fff ){
p[0] = ((v>>7)&0x7f)|0x80;
p[1] = v&0x7f;
return 2;
}
return sqlite3PutVarint(p, v);
return putVarint64(p,v);
}
/*