//===-- AArch64SelectionDAGInfo.cpp - AArch64 SelectionDAG Info -----------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements the AArch64SelectionDAGInfo class. // //===----------------------------------------------------------------------===// #include "AArch64TargetMachine.h" using namespace llvm; #define DEBUG_TYPE "aarch64-selectiondag-info" AArch64SelectionDAGInfo::AArch64SelectionDAGInfo(const DataLayout *DL) : TargetSelectionDAGInfo(DL) {} AArch64SelectionDAGInfo::~AArch64SelectionDAGInfo() {} SDValue AArch64SelectionDAGInfo::EmitTargetCodeForMemset( SelectionDAG &DAG, SDLoc dl, SDValue Chain, SDValue Dst, SDValue Src, SDValue Size, unsigned Align, bool isVolatile, MachinePointerInfo DstPtrInfo) const { // Check to see if there is a specialized entry-point for memory zeroing. ConstantSDNode *V = dyn_cast<ConstantSDNode>(Src); ConstantSDNode *SizeValue = dyn_cast<ConstantSDNode>(Size); const char *bzeroEntry = (V && V->isNullValue()) ? DAG.getTarget().getSubtarget<AArch64Subtarget>().getBZeroEntry() : nullptr; // For small size (< 256), it is not beneficial to use bzero // instead of memset. if (bzeroEntry && (!SizeValue || SizeValue->getZExtValue() > 256)) { const AArch64TargetLowering &TLI = *static_cast<const AArch64TargetLowering *>( DAG.getTarget().getTargetLowering()); EVT IntPtr = TLI.getPointerTy(); Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext()); TargetLowering::ArgListTy Args; TargetLowering::ArgListEntry Entry; Entry.Node = Dst; Entry.Ty = IntPtrTy; Args.push_back(Entry); Entry.Node = Size; Args.push_back(Entry); TargetLowering::CallLoweringInfo CLI(DAG); CLI.setDebugLoc(dl).setChain(Chain) .setCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()), DAG.getExternalSymbol(bzeroEntry, IntPtr), std::move(Args), 0) .setDiscardResult(); std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI); return CallResult.second; } return SDValue(); }