1 //===-- HexagonSelectionDAGInfo.cpp - Hexagon SelectionDAG Info -----------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the HexagonSelectionDAGInfo class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "HexagonTargetMachine.h" 15 #include "llvm/CodeGen/SelectionDAG.h" 16 using namespace llvm; 17 18 #define DEBUG_TYPE "hexagon-selectiondag-info" 19 20 SDValue HexagonSelectionDAGInfo::EmitTargetCodeForMemcpy( 21 SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src, 22 SDValue Size, unsigned Align, bool isVolatile, bool AlwaysInline, 23 MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const { 24 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size); 25 if (AlwaysInline || (Align & 0x3) != 0 || !ConstantSize) 26 return SDValue(); 27 28 uint64_t SizeVal = ConstantSize->getZExtValue(); 29 if (SizeVal < 32 || (SizeVal % 8) != 0) 30 return SDValue(); 31 32 // Special case aligned memcpys with size >= 32 bytes and a multiple of 8. 33 // 34 const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering(); 35 TargetLowering::ArgListTy Args; 36 TargetLowering::ArgListEntry Entry; 37 Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext()); 38 Entry.Node = Dst; 39 Args.push_back(Entry); 40 Entry.Node = Src; 41 Args.push_back(Entry); 42 Entry.Node = Size; 43 Args.push_back(Entry); 44 45 const char *SpecialMemcpyName = 46 "__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes"; 47 48 TargetLowering::CallLoweringInfo CLI(DAG); 49 CLI.setDebugLoc(dl) 50 .setChain(Chain) 51 .setCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY), 52 Type::getVoidTy(*DAG.getContext()), 53 DAG.getTargetExternalSymbol( 54 SpecialMemcpyName, TLI.getPointerTy(DAG.getDataLayout())), 55 std::move(Args)) 56 .setDiscardResult(); 57 58 std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI); 59 return CallResult.second; 60 } 61
