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Avoid unnecessary calls to ExpandBlob() for smaller and faster code.

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FossilOrigin-Name: 5e196fd18169e84806cd45dd1a8190339323e772
This commit is contained in:
drh
2016-09-20 01:19:18 +00:00
parent fadd2b1972
commit 8aaf7bcc8d
5 changed files with 35 additions and 27 deletions
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19
src/vdbeaux.c
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@@ -3712,10 +3712,12 @@ static int vdbeCompareMemString(
** The input pBlob is guaranteed to be a Blob that is not marked
** with MEM_Zero. Return true if it could be a zero-blob.
*/
static int isZeroBlob(const Mem *pBlob){
static int isAllZero(const char *z, int n){
int i;
for(i=0; i<pBlob->n && pBlob->z[i]==0; i++){}
return i==pBlob->n;
for(i=0; i<n; i++){
if( z[i] ) return 0;
}
return 1;
}
/*
@@ -3739,10 +3741,10 @@ static SQLITE_NOINLINE int sqlite3BlobCompare(const Mem *pB1, const Mem *pB2){
if( pB1->flags & pB2->flags & MEM_Zero ){
return pB1->u.nZero - pB2->u.nZero;
}else if( pB1->flags & MEM_Zero ){
if( !isZeroBlob(pB2) ) return -1;
if( !isAllZero(pB2->z, pB2->n) ) return -1;
return pB1->u.nZero - n2;
}else{
if( !isZeroBlob(pB1) ) return +1;
if( !isAllZero(pB1->z, pB1->n) ) return +1;
return n1 - pB2->u.nZero;
}
}
@@ -4054,6 +4056,7 @@ int sqlite3VdbeRecordCompareWithSkip(
/* RHS is a blob */
else if( pRhs->flags & MEM_Blob ){
assert( (pRhs->flags & MEM_Zero)==0 || pRhs->n==0 );
getVarint32(&aKey1[idx1], serial_type);
testcase( serial_type==12 );
if( serial_type<12 || (serial_type & 0x01) ){
@@ -4065,6 +4068,12 @@ int sqlite3VdbeRecordCompareWithSkip(
if( (d1+nStr) > (unsigned)nKey1 ){
pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
return 0; /* Corruption */
}else if( pRhs->flags & MEM_Zero ){
if( !isAllZero((const char*)&aKey1[d1],nStr) ){
rc = 1;
}else{
rc = nStr - pRhs->u.nZero;
}
}else{
int nCmp = MIN(nStr, pRhs->n);
rc = memcmp(&aKey1[d1], pRhs->z, nCmp);