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Experimental code-generator changes to utilize new opcodes for sorting.

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FossilOrigin-Name: bab2e560f6cb989c83a96aad60f666960ede7abe
This commit is contained in:
drh
2011-09-01 15:32:47 +00:00
parent 96862072b8
commit c6aff30ca4
7 changed files with 58 additions and 18 deletions
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35
src/select.c
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@@ -419,12 +419,18 @@ static void pushOntoSorter(
int nExpr = pOrderBy->nExpr;
int regBase = sqlite3GetTempRange(pParse, nExpr+2);
int regRecord = sqlite3GetTempReg(pParse);
int op;
sqlite3ExprCacheClear(pParse);
sqlite3ExprCodeExprList(pParse, pOrderBy, regBase, 0);
sqlite3VdbeAddOp2(v, OP_Sequence, pOrderBy->iECursor, regBase+nExpr);
sqlite3ExprCodeMove(pParse, regData, regBase+nExpr+1, 1);
sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase, nExpr + 2, regRecord);
sqlite3VdbeAddOp2(v, OP_IdxInsert, pOrderBy->iECursor, regRecord);
if( pSelect->selFlags & SF_UseSorter ){
op = OP_SorterInsert;
}else{
op = OP_IdxInsert;
}
sqlite3VdbeAddOp2(v, op, pOrderBy->iECursor, regRecord);
sqlite3ReleaseTempReg(pParse, regRecord);
sqlite3ReleaseTempRange(pParse, regBase, nExpr+2);
if( pSelect->iLimit ){
@@ -893,9 +899,20 @@ static void generateSortTail(
}else{
regRowid = sqlite3GetTempReg(pParse);
}
addr = 1 + sqlite3VdbeAddOp2(v, OP_Sort, iTab, addrBreak);
codeOffset(v, p, addrContinue);
sqlite3VdbeAddOp3(v, OP_Column, iTab, pOrderBy->nExpr + 1, regRow);
if( p->selFlags & SF_UseSorter ){
int regSortOut = sqlite3GetTempReg(pParse);
int ptab2 = pParse->nTab++;
sqlite3VdbeAddOp3(v, OP_OpenPseudo, ptab2, regSortOut, pOrderBy->nExpr+2);
addr = 1 + sqlite3VdbeAddOp2(v, OP_SorterSort, iTab, addrBreak);
codeOffset(v, p, addrContinue);
sqlite3VdbeAddOp2(v, OP_SorterData, iTab, regSortOut);
sqlite3VdbeAddOp3(v, OP_Column, ptab2, pOrderBy->nExpr+1, regRow);
sqlite3VdbeChangeP5(v, OPFLAG_CLEARCACHE);
}else{
addr = 1 + sqlite3VdbeAddOp2(v, OP_Sort, iTab, addrBreak);
codeOffset(v, p, addrContinue);
sqlite3VdbeAddOp3(v, OP_Column, iTab, pOrderBy->nExpr+1, regRow);
}
switch( eDest ){
case SRT_Table:
case SRT_EphemTab: {
@@ -948,7 +965,11 @@ static void generateSortTail(
/* The bottom of the loop
*/
sqlite3VdbeResolveLabel(v, addrContinue);
sqlite3VdbeAddOp2(v, OP_Next, iTab, addr);
if( p->selFlags & SF_UseSorter ){
sqlite3VdbeAddOp2(v, OP_SorterNext, iTab, addr);
}else{
sqlite3VdbeAddOp2(v, OP_Next, iTab, addr);
}
sqlite3VdbeResolveLabel(v, addrBreak);
if( eDest==SRT_Output || eDest==SRT_Coroutine ){
sqlite3VdbeAddOp2(v, OP_Close, pseudoTab, 0);
@@ -3914,6 +3935,10 @@ int sqlite3Select(
iEnd = sqlite3VdbeMakeLabel(v);
p->nSelectRow = (double)LARGEST_INT64;
computeLimitRegisters(pParse, p, iEnd);
if( p->iLimit==0 && addrSortIndex>=0 ){
sqlite3VdbeGetOp(v, addrSortIndex)->opcode = OP_SorterOpen;
p->selFlags |= SF_UseSorter;
}
/* Open a virtual index to use for the distinct set.
*/