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Performance optimizations to the editdist3() function in the spellfix

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extension.

FossilOrigin-Name: 70d304dcbac4c3fd5e3b96108bffea2ce6c0db19c847397d5c5e268bb90a981d
This commit is contained in:
drh
2018-02-14 20:58:36 +00:00
parent 0fae06fcb6
commit d9274a8ae3
3 changed files with 13 additions and 15 deletions
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14
ext/misc/spellfix.c
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@ -691,6 +691,7 @@ static int editDist3ConfigLoad(
assert( zTo!=0 || nTo==0 );
if( nFrom>100 || nTo>100 ) continue;
if( iCost<0 ) continue;
if( iCost>10000 ) continue; /* Costs above 10K are considered infinite */
if( pLang==0 || iLang!=iLangPrev ){
EditDist3Lang *pNew;
pNew = sqlite3_realloc64(p->a, (p->nLang+1)*sizeof(p->a[0]));
@ -782,7 +783,7 @@ static int matchFromTo(
){
int b1 = pStr->a[n1].nByte;
if( b1>n2 ) return 0;
if( memcmp(pStr->z+n1, z2, b1)!=0 ) return 0;
if( strncmp(pStr->z+n1, z2, b1)!=0 ) return 0;
return 1;
}
@ -864,9 +865,6 @@ static EditDist3FromString *editDist3FromStringNew(
/*
** Update entry m[i] such that it is the minimum of its current value
** and m[j]+iCost.
**
** If the iCost is 1,000,000 or greater, then consider the cost to be
** infinite and skip the update.
*/
static void updateCost(
unsigned int *m,
@ -874,11 +872,11 @@ static void updateCost(
int j,
int iCost
){
unsigned int b;
assert( iCost>=0 );
if( iCost<10000 ){
unsigned int b = m[j] + iCost;
if( b<m[i] ) m[i] = b;
}
assert( iCost<10000 );
b = m[j] + iCost;
if( b<m[i] ) m[i] = b;
}
/*