+ // We have a number of constant values, constant fold them element by element.
+ for (unsigned I = 0, E = Inputs.size(); I != E; ++I) {
+ const APInt &C1 = Inputs[I].first->getAPIntValue();
+ const APInt &C2 = Inputs[I].second->getAPIntValue();
+
+ switch (Opcode) {
+ case ISD::ADD:
+ Outputs.push_back(getConstant(C1 + C2, SVT));
+ break;
+ case ISD::SUB:
+ Outputs.push_back(getConstant(C1 - C2, SVT));
+ break;
+ case ISD::MUL:
+ Outputs.push_back(getConstant(C1 * C2, SVT));
+ break;
+ case ISD::UDIV:
+ if (!C2.getBoolValue())
+ return SDValue();
+ Outputs.push_back(getConstant(C1.udiv(C2), SVT));
+ break;
+ case ISD::UREM:
+ if (!C2.getBoolValue())
+ return SDValue();
+ Outputs.push_back(getConstant(C1.urem(C2), SVT));
+ break;
+ case ISD::SDIV:
+ if (!C2.getBoolValue())
+ return SDValue();
+ Outputs.push_back(getConstant(C1.sdiv(C2), SVT));
+ break;
+ case ISD::SREM:
+ if (!C2.getBoolValue())
+ return SDValue();
+ Outputs.push_back(getConstant(C1.srem(C2), SVT));
+ break;
+ case ISD::AND:
+ Outputs.push_back(getConstant(C1 & C2, SVT));
+ break;
+ case ISD::OR:
+ Outputs.push_back(getConstant(C1 | C2, SVT));
+ break;
+ case ISD::XOR:
+ Outputs.push_back(getConstant(C1 ^ C2, SVT));
+ break;
+ case ISD::SHL:
+ Outputs.push_back(getConstant(C1 << C2, SVT));
+ break;
+ case ISD::SRL:
+ Outputs.push_back(getConstant(C1.lshr(C2), SVT));
+ break;
+ case ISD::SRA:
+ Outputs.push_back(getConstant(C1.ashr(C2), SVT));
+ break;
+ case ISD::ROTL:
+ Outputs.push_back(getConstant(C1.rotl(C2), SVT));
+ break;
+ case ISD::ROTR:
+ Outputs.push_back(getConstant(C1.rotr(C2), SVT));
+ break;
+ default:
+ return SDValue();
+ }
+ }
+
+ // Handle the scalar case first.
+ if (Scalar1 && Scalar2)
+ return Outputs.back();
+
+ // Otherwise build a big vector out of the scalar elements we generated.
+ return getNode(ISD::BUILD_VECTOR, SDLoc(), VT, Outputs.data(),
+ Outputs.size());