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 TargetMachine &TM)
20 : TargetSelectionDAGInfo(TM),
21 Subtarget(&TM.getSubtarget<AArch64Subtarget>()) {}
23 AArch64SelectionDAGInfo::~AArch64SelectionDAGInfo() {}
25 SDValue AArch64SelectionDAGInfo::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() : nullptr;
34 // For small size (< 256), it is not beneficial to use bzero
36 if (bzeroEntry && (!SizeValue || SizeValue->getZExtValue() > 256)) {
37 const AArch64TargetLowering &TLI =
38 *static_cast<const AArch64TargetLowering *>(
39 DAG.getTarget().getTargetLowering());
41 EVT IntPtr = TLI.getPointerTy();
42 Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext());
43 TargetLowering::ArgListTy Args;
44 TargetLowering::ArgListEntry Entry;
47 Args.push_back(Entry);
49 Args.push_back(Entry);
50 TargetLowering::CallLoweringInfo CLI(DAG);
51 CLI.setDebugLoc(dl).setChain(Chain)
52 .setCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()),
53 DAG.getExternalSymbol(bzeroEntry, IntPtr), &Args, 0)
55 std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
56 return CallResult.second;