1//===-- AArch64SelectionDAGInfo.cpp - AArch64 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 AArch64SelectionDAGInfo class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "AArch64TargetMachine.h" 15using namespace llvm; 16 17#define DEBUG_TYPE "aarch64-selectiondag-info" 18 19AArch64SelectionDAGInfo::AArch64SelectionDAGInfo(const DataLayout *DL) 20 : TargetSelectionDAGInfo(DL) {} 21 22AArch64SelectionDAGInfo::~AArch64SelectionDAGInfo() {} 23 24SDValue AArch64SelectionDAGInfo::EmitTargetCodeForMemset( 25 SelectionDAG &DAG, SDLoc dl, SDValue Chain, SDValue Dst, SDValue Src, 26 SDValue Size, unsigned Align, bool isVolatile, 27 MachinePointerInfo DstPtrInfo) const { 28 // Check to see if there is a specialized entry-point for memory zeroing. 29 ConstantSDNode *V = dyn_cast<ConstantSDNode>(Src); 30 ConstantSDNode *SizeValue = dyn_cast<ConstantSDNode>(Size); 31 const char *bzeroEntry = 32 (V && V->isNullValue()) 33 ? DAG.getTarget().getSubtarget<AArch64Subtarget>().getBZeroEntry() 34 : nullptr; 35 // For small size (< 256), it is not beneficial to use bzero 36 // instead of memset. 37 if (bzeroEntry && (!SizeValue || SizeValue->getZExtValue() > 256)) { 38 const AArch64TargetLowering &TLI = 39 *static_cast<const AArch64TargetLowering *>( 40 DAG.getTarget().getTargetLowering()); 41 42 EVT IntPtr = TLI.getPointerTy(); 43 Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext()); 44 TargetLowering::ArgListTy Args; 45 TargetLowering::ArgListEntry Entry; 46 Entry.Node = Dst; 47 Entry.Ty = IntPtrTy; 48 Args.push_back(Entry); 49 Entry.Node = Size; 50 Args.push_back(Entry); 51 TargetLowering::CallLoweringInfo CLI(DAG); 52 CLI.setDebugLoc(dl).setChain(Chain) 53 .setCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()), 54 DAG.getExternalSymbol(bzeroEntry, IntPtr), std::move(Args), 0) 55 .setDiscardResult(); 56 std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI); 57 return CallResult.second; 58 } 59 return SDValue(); 60} 61