forked from OSchip/llvm-project
59 lines
2.3 KiB
C++
59 lines
2.3 KiB
C++
//===-- ARM64SelectionDAGInfo.cpp - ARM64 SelectionDAG Info ---------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the ARM64SelectionDAGInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "ARM64TargetMachine.h"
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using namespace llvm;
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#define DEBUG_TYPE "arm64-selectiondag-info"
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ARM64SelectionDAGInfo::ARM64SelectionDAGInfo(const TargetMachine &TM)
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: TargetSelectionDAGInfo(TM),
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Subtarget(&TM.getSubtarget<ARM64Subtarget>()) {}
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ARM64SelectionDAGInfo::~ARM64SelectionDAGInfo() {}
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SDValue ARM64SelectionDAGInfo::EmitTargetCodeForMemset(
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SelectionDAG &DAG, SDLoc dl, SDValue Chain, SDValue Dst, SDValue Src,
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SDValue Size, unsigned Align, bool isVolatile,
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MachinePointerInfo DstPtrInfo) const {
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// Check to see if there is a specialized entry-point for memory zeroing.
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ConstantSDNode *V = dyn_cast<ConstantSDNode>(Src);
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ConstantSDNode *SizeValue = dyn_cast<ConstantSDNode>(Size);
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const char *bzeroEntry =
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(V && V->isNullValue()) ? Subtarget->getBZeroEntry() : nullptr;
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// For small size (< 256), it is not beneficial to use bzero
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// instead of memset.
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if (bzeroEntry && (!SizeValue || SizeValue->getZExtValue() > 256)) {
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const ARM64TargetLowering &TLI = *static_cast<const ARM64TargetLowering *>(
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DAG.getTarget().getTargetLowering());
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EVT IntPtr = TLI.getPointerTy();
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Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext());
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TargetLowering::ArgListTy Args;
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TargetLowering::ArgListEntry Entry;
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Entry.Node = Dst;
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Entry.Ty = IntPtrTy;
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Args.push_back(Entry);
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Entry.Node = Size;
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Args.push_back(Entry);
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TargetLowering::CallLoweringInfo CLI(
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Chain, Type::getVoidTy(*DAG.getContext()), false, false, false, false,
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0, CallingConv::C, /*isTailCall=*/false,
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/*doesNotRet=*/false, /*isReturnValueUsed=*/false,
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DAG.getExternalSymbol(bzeroEntry, IntPtr), Args, DAG, dl);
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std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
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return CallResult.second;
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}
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return SDValue();
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}
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