[Hexagon] Implement @llvm.readcyclecounter()
llvm-svn: 295892
diff --git a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
index e67b2e1..be44dfb 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
@@ -1062,6 +1062,18 @@
return DAG.getNode(HexagonISD::DCFETCH, DL, MVT::Other, Chain, Addr, Zero);
}
+// Custom-handle ISD::READCYCLECOUNTER because the target-independent SDNode
+// is marked as having side-effects, while the register read on Hexagon does
+// not have any. TableGen refuses to accept the direct pattern from that node
+// to the A4_tfrcpp.
+SDValue HexagonTargetLowering::LowerREADCYCLECOUNTER(SDValue Op,
+ SelectionDAG &DAG) const {
+ SDValue Chain = Op.getOperand(0);
+ SDLoc dl(Op);
+ SDVTList VTs = DAG.getVTList(MVT::i32, MVT::Other);
+ return DAG.getNode(HexagonISD::READCYCLE, dl, VTs, Chain);
+}
+
SDValue HexagonTargetLowering::LowerINTRINSIC_VOID(SDValue Op,
SelectionDAG &DAG) const {
SDValue Chain = Op.getOperand(0);
@@ -1828,6 +1840,7 @@
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
setOperationAction(ISD::INLINEASM, MVT::Other, Custom);
setOperationAction(ISD::PREFETCH, MVT::Other, Custom);
+ setOperationAction(ISD::READCYCLECOUNTER, MVT::i64, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::Other, Custom);
setOperationAction(ISD::EH_RETURN, MVT::Other, Custom);
setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
@@ -2303,6 +2316,7 @@
case HexagonISD::VSRLW: return "HexagonISD::VSRLW";
case HexagonISD::VSXTBH: return "HexagonISD::VSXTBH";
case HexagonISD::VSXTBW: return "HexagonISD::VSXTBW";
+ case HexagonISD::READCYCLE: return "HexagonISD::READCYCLE";
case HexagonISD::OP_END: break;
}
return nullptr;
@@ -2980,6 +2994,7 @@
case ISD::INTRINSIC_VOID: return LowerINTRINSIC_VOID(Op, DAG);
case ISD::INLINEASM: return LowerINLINEASM(Op, DAG);
case ISD::PREFETCH: return LowerPREFETCH(Op, DAG);
+ case ISD::READCYCLECOUNTER: return LowerREADCYCLECOUNTER(Op, DAG);
}
}