1 //===-- ARM64SelectionDAGInfo.cpp - ARM64 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 ARM64SelectionDAGInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "ARM64TargetMachine.h"
17 #define DEBUG_TYPE "arm64-selectiondag-info"
19 ARM64SelectionDAGInfo::ARM64SelectionDAGInfo(const TargetMachine &TM)
20 : TargetSelectionDAGInfo(TM),
21 Subtarget(&TM.getSubtarget<ARM64Subtarget>()) {}
23 ARM64SelectionDAGInfo::~ARM64SelectionDAGInfo() {}
25 SDValue ARM64SelectionDAGInfo::EmitTargetCodeForMemset(
26 SelectionDAG &DAG, SDLoc dl, SDValue Chain, SDValue Dst, SDValue Src,
27 SDValue Size, unsigned Align, bool isVolatile,
28 MachinePointerInfo DstPtrInfo) const {
29 // Check to see if there is a specialized entry-point for memory zeroing.
30 ConstantSDNode *V = dyn_cast<ConstantSDNode>(Src);
31 ConstantSDNode *SizeValue = dyn_cast<ConstantSDNode>(Size);
32 const char *bzeroEntry =
33 (V && V->isNullValue()) ? Subtarget->getBZeroEntry() : 0;
34 // For small size (< 256), it is not beneficial to use bzero
36 if (bzeroEntry && (!SizeValue || SizeValue->getZExtValue() > 256)) {
37 const ARM64TargetLowering &TLI = *static_cast<const ARM64TargetLowering *>(
38 DAG.getTarget().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(
50 Chain, Type::getVoidTy(*DAG.getContext()), false, false, false, false,
51 0, CallingConv::C, /*isTailCall=*/false,
52 /*doesNotRet=*/false, /*isReturnValueUsed=*/false,
53 DAG.getExternalSymbol(bzeroEntry, IntPtr), Args, DAG, dl);
54 std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
55 return CallResult.second;