65 lines
2.3 KiB
C++
65 lines
2.3 KiB
C++
//===-- HexagonSelectionDAGInfo.cpp - Hexagon 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 HexagonSelectionDAGInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "HexagonTargetMachine.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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using namespace llvm;
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#define DEBUG_TYPE "hexagon-selectiondag-info"
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SDValue HexagonSelectionDAGInfo::EmitTargetCodeForMemcpy(
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SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
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SDValue Size, unsigned Align, bool isVolatile, bool AlwaysInline,
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MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
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ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
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if (AlwaysInline || (Align & 0x3) != 0 || !ConstantSize)
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return SDValue();
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uint64_t SizeVal = ConstantSize->getZExtValue();
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if (SizeVal < 32 || (SizeVal % 8) != 0)
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return SDValue();
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// Special case aligned memcpys with size >= 32 bytes and a multiple of 8.
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//
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const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
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TargetLowering::ArgListTy Args;
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TargetLowering::ArgListEntry Entry;
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Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
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Entry.Node = Dst;
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Args.push_back(Entry);
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Entry.Node = Src;
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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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const char *SpecialMemcpyName =
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"__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes";
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const MachineFunction &MF = DAG.getMachineFunction();
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bool LongCalls = MF.getSubtarget<HexagonSubtarget>().useLongCalls();
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unsigned Flags = LongCalls ? HexagonII::HMOTF_ConstExtended : 0;
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TargetLowering::CallLoweringInfo CLI(DAG);
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CLI.setDebugLoc(dl)
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.setChain(Chain)
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.setLibCallee(
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TLI.getLibcallCallingConv(RTLIB::MEMCPY),
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Type::getVoidTy(*DAG.getContext()),
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DAG.getTargetExternalSymbol(
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SpecialMemcpyName, TLI.getPointerTy(DAG.getDataLayout()), Flags),
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std::move(Args))
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.setDiscardResult();
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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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