}
return SDValue();
}
+
+std::pair<SDValue, SDValue> SystemZSelectionDAGInfo::
+EmitTargetCodeForMemcmp(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
+ SDValue Src1, SDValue Src2, SDValue Size,
+ MachinePointerInfo Op1PtrInfo,
+ MachinePointerInfo Op2PtrInfo) const {
+ if (ConstantSDNode *CSize = dyn_cast<ConstantSDNode>(Size)) {
+ uint64_t Bytes = CSize->getZExtValue();
+ if (Bytes >= 1 && Bytes <= 0x100) {
+ // A single CLC.
+ SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
+ Chain = DAG.getNode(SystemZISD::CLC, DL, VTs, Chain,
+ Src1, Src2, Size);
+ SDValue Glue = Chain.getValue(1);
+ // IPM inserts the CC value into bits 29 and 28, with 0 meaning "equal",
+ // 1 meaning "greater" and 2 meaning "less". Convert them into an
+ // integer that is respectively equal, greater or less than 0.
+ SDValue IPM = DAG.getNode(SystemZISD::IPM, DL, MVT::i32, Glue);
+ SDValue SHL = DAG.getNode(ISD::SHL, DL, MVT::i32, IPM,
+ DAG.getConstant(2, MVT::i32));
+ SDValue SRA = DAG.getNode(ISD::SRA, DL, MVT::i32, SHL,
+ DAG.getConstant(30, MVT::i32));
+ return std::make_pair(SRA, Chain);
+ }
+ }
+ return std::make_pair(SDValue(), SDValue());
+}