[llvm-commits] [llvm] r147728 - /llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

[Duncan Sands]

Hi Craig,

> @@ -1656,6 +1660,51 @@
>     return SDValue();
>   }
>
> +SDValue DAGCombiner::visitSUBC(SDNode *N) {
> +  SDValue N0 = N->getOperand(0);
> +  SDValue N1 = N->getOperand(1);
> +  ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
> +  ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
> +  EVT VT = N0.getValueType();
> +
> +  // If the flag result is dead, turn this into an SUB.
> +  if (N->hasNUsesOfValue(0, 1))

this could be !N->hasAnyUseOfValue().

Ciao, Duncan.