+static std::pair<APInt, bool> FoldValue(unsigned Opcode, const APInt &C1,
+ const APInt &C2) {
+ switch (Opcode) {
+ case ISD::ADD: return std::make_pair(C1 + C2, true);
+ case ISD::SUB: return std::make_pair(C1 - C2, true);
+ case ISD::MUL: return std::make_pair(C1 * C2, true);
+ case ISD::AND: return std::make_pair(C1 & C2, true);
+ case ISD::OR: return std::make_pair(C1 | C2, true);
+ case ISD::XOR: return std::make_pair(C1 ^ C2, true);
+ case ISD::SHL: return std::make_pair(C1 << C2, true);
+ case ISD::SRL: return std::make_pair(C1.lshr(C2), true);
+ case ISD::SRA: return std::make_pair(C1.ashr(C2), true);
+ case ISD::ROTL: return std::make_pair(C1.rotl(C2), true);
+ case ISD::ROTR: return std::make_pair(C1.rotr(C2), true);
+ case ISD::UDIV:
+ if (!C2.getBoolValue())
+ break;
+ return std::make_pair(C1.udiv(C2), true);
+ case ISD::UREM:
+ if (!C2.getBoolValue())
+ break;
+ return std::make_pair(C1.urem(C2), true);
+ case ISD::SDIV:
+ if (!C2.getBoolValue())
+ break;
+ return std::make_pair(C1.sdiv(C2), true);
+ case ISD::SREM:
+ if (!C2.getBoolValue())
+ break;
+ return std::make_pair(C1.srem(C2), true);
+ }
+ return std::make_pair(APInt(1, 0), false);
+}
+
+SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode, SDLoc DL, EVT VT,
+ const ConstantSDNode *Cst1,
+ const ConstantSDNode *Cst2) {
+ if (Cst1->isOpaque() || Cst2->isOpaque())
+ return SDValue();
+
+ std::pair<APInt, bool> Folded = FoldValue(Opcode, Cst1->getAPIntValue(),
+ Cst2->getAPIntValue());
+ if (!Folded.second)
+ return SDValue();
+ return getConstant(Folded.first, DL, VT);
+}
+
+SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode, SDLoc DL, EVT VT,