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Overview
| Comment: | Performance improvement in the printf() logic by avoiding unnecessary stack pointer movement. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | f7f2160db014f0ae11ad13c8ad70ad34 |
| User & Date: | drh 2014-08-22 15:40:20 |
Context
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2014-08-22
| ||
| 18:00 | Split the sqlite3Error() routine into sqlite3Error() and sqlite3ErrorWithMsg(), for a slight size reduction and performance increase. check-in: cf561d1f user: drh tags: trunk | |
| 15:40 | Performance improvement in the printf() logic by avoiding unnecessary stack pointer movement. check-in: f7f2160d user: drh tags: trunk | |
| 15:19 | Improve the performance and reduce the size of the sqlite3VdbeSerialGet() routine by avoiding the use of stack. check-in: ebc10e46 user: drh tags: trunk | |
Changes
Changes to src/printf.c.
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** The StrAccum "p" is not large enough to accept N new bytes of z[].
** So enlarge if first, then do the append.
**
** This is a helper routine to sqlite3StrAccumAppend() that does special-case
** work (enlarging the buffer) using tail recursion, so that the
** sqlite3StrAccumAppend() routine can use fast calling semantics.
*/
static void enlargeAndAppend(StrAccum *p, const char *z, int N){
N = sqlite3StrAccumEnlarge(p, N);
if( N>0 ){
memcpy(&p->zText[p->nChar], z, N);
p->nChar += N;
}
}
................................................................................
void sqlite3StrAccumAppend(StrAccum *p, const char *z, int N){
assert( z!=0 );
assert( p->zText!=0 || p->nChar==0 || p->accError );
assert( N>=0 );
assert( p->accError==0 || p->nAlloc==0 );
if( p->nChar+N >= p->nAlloc ){
enlargeAndAppend(p,z,N);
return;
}
assert( p->zText );
memcpy(&p->zText[p->nChar], z, N);
p->nChar += N;
}
/*
** Append the complete text of zero-terminated string z[] to the p string.
*/
void sqlite3StrAccumAppendAll(StrAccum *p, const char *z){
sqlite3StrAccumAppend(p, z, sqlite3Strlen30(z));
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** The StrAccum "p" is not large enough to accept N new bytes of z[]. ** So enlarge if first, then do the append. ** ** This is a helper routine to sqlite3StrAccumAppend() that does special-case ** work (enlarging the buffer) using tail recursion, so that the ** sqlite3StrAccumAppend() routine can use fast calling semantics. */ static void SQLITE_NOINLINE enlargeAndAppend(StrAccum *p, const char *z, int N){ N = sqlite3StrAccumEnlarge(p, N); if( N>0 ){ memcpy(&p->zText[p->nChar], z, N); p->nChar += N; } } ................................................................................ void sqlite3StrAccumAppend(StrAccum *p, const char *z, int N){ assert( z!=0 ); assert( p->zText!=0 || p->nChar==0 || p->accError ); assert( N>=0 ); assert( p->accError==0 || p->nAlloc==0 ); if( p->nChar+N >= p->nAlloc ){ enlargeAndAppend(p,z,N); }else{ assert( p->zText ); p->nChar += N; memcpy(&p->zText[p->nChar-N], z, N); } } /* ** Append the complete text of zero-terminated string z[] to the p string. */ void sqlite3StrAccumAppendAll(StrAccum *p, const char *z){ sqlite3StrAccumAppend(p, z, sqlite3Strlen30(z)); |