1 //===-- AArch64SelectionDAGInfo.cpp - AArch64 SelectionDAG Info -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the AArch64SelectionDAGInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "AArch64TargetMachine.h"
17 #define DEBUG_TYPE "aarch64-selectiondag-info"
19 AArch64SelectionDAGInfo::AArch64SelectionDAGInfo(const DataLayout *DL)
20 : TargetSelectionDAGInfo(DL) {}
22 AArch64SelectionDAGInfo::~AArch64SelectionDAGInfo() {}
24 SDValue 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 AArch64Subtarget &STI =
32 DAG.getMachineFunction().getSubtarget<AArch64Subtarget>();
33 const char *bzeroEntry =
34 (V && V->isNullValue()) ? STI.getBZeroEntry() : nullptr;
35 // For small size (< 256), it is not beneficial to use bzero
37 if (bzeroEntry && (!SizeValue || SizeValue->getZExtValue() > 256)) {
38 const AArch64TargetLowering &TLI = *STI.getTargetLowering();
40 EVT IntPtr = TLI.getPointerTy();
41 Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext());
42 TargetLowering::ArgListTy Args;
43 TargetLowering::ArgListEntry Entry;
46 Args.push_back(Entry);
48 Args.push_back(Entry);
49 TargetLowering::CallLoweringInfo CLI(DAG);
50 CLI.setDebugLoc(dl).setChain(Chain)
51 .setCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()),
52 DAG.getExternalSymbol(bzeroEntry, IntPtr), std::move(Args), 0)
54 std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
55 return CallResult.second;