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Performance improvements to the (debug-use only) Mem.pScopyFrom logic, resulting

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in about 8x faster performance under -DSQLITE_DEBUG for the query in from
[forum:/forumpost/0025389d0860af82|forum post 0025389d0860af82].  This change
only affects builds that use -DSQLITE_DEBUG.

FossilOrigin-Name: 7fb1ae25d1572dd7709a0f850c148a5f745a524f01ea231e29a1ebc37c173fb9
This commit is contained in:
drh
2025-01-21 16:30:55 +00:00
parent 2e899ccaff
commit 8e7a16895c
7 changed files with 39 additions and 30 deletions
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3
src/vdbe.c
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@@ -607,6 +607,7 @@ static void registerTrace(int iReg, Mem *p){
printf("R[%d] = ", iReg);
memTracePrint(p);
if( p->pScopyFrom ){
assert( p->pScopyFrom->bScopy );
printf(" <== R[%d]", (int)(p->pScopyFrom - &p[-iReg]));
}
printf("\n");
@@ -1590,6 +1591,7 @@ case OP_Move: {
{ int i;
for(i=1; i<p->nMem; i++){
if( aMem[i].pScopyFrom==pIn1 ){
assert( aMem[i].bScopy );
aMem[i].pScopyFrom = pOut;
}
}
@@ -1662,6 +1664,7 @@ case OP_SCopy: { /* out2 */
#ifdef SQLITE_DEBUG
pOut->pScopyFrom = pIn1;
pOut->mScopyFlags = pIn1->flags;
pIn1->bScopy = 1;
#endif
break;
}