Combine adjacent single-register OP_Copy instructions into a single
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
diff --git a/src/expr.c b/src/expr.c
index 81eb00c..8ee73ac 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -3428,7 +3428,17 @@
}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);
+ }
}
}
}