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Combine adjacent single-register OP_Copy instructions into a single

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multi-register OP_Copy, where possible.  Fix the Synopsis comment for
multi-register OP_Copy instructions to show the correct register ranges.

FossilOrigin-Name: 2ae22dc0cbed2feca4baf89d02aaace0331971d6
This commit is contained in:
drh
2013-12-20 15:59:20 +00:00
parent aed1819875
commit 4eded604ea
5 changed files with 42 additions and 13 deletions
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12
src/expr.c
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@@ -3428,7 +3428,17 @@ int sqlite3ExprCodeExprList(
}else{
int inReg = sqlite3ExprCodeTarget(pParse, pExpr, target+i);
if( inReg!=target+i ){
sqlite3VdbeAddOp2(pParse->pVdbe, copyOp, inReg, target+i);
VdbeOp *pOp;
Vdbe *v = pParse->pVdbe;
if( copyOp==OP_Copy
&& (pOp=sqlite3VdbeGetOp(v, -1))->opcode==OP_Copy
&& pOp->p1+pOp->p3+1==inReg
&& pOp->p2+pOp->p3+1==target+i
){
pOp->p3++;
}else{
sqlite3VdbeAddOp2(v, copyOp, inReg, target+i);
}
}
}
}