lib/Target/XCore/XCoreSelectionDAGInfo.cpp

   1 //===-- XCoreSelectionDAGInfo.cpp - XCore SelectionDAG Info ---------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements the XCoreSelectionDAGInfo class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "XCoreTargetMachine.h"
  14 using namespace llvm;
  15
  16 #define DEBUG_TYPE "xcore-selectiondag-info"
  17
  18 SDValue XCoreSelectionDAGInfo::EmitTargetCodeForMemcpy(
  19     SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
  20     SDValue Size, unsigned Align, bool isVolatile, bool AlwaysInline,
  21     MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
  22   unsigned SizeBitWidth = Size.getValueSizeInBits();
  23   // Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
  24   if (!AlwaysInline && (Align & 3) == 0 &&
  25       DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
  26     const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
  27     TargetLowering::ArgListTy Args;
  28     TargetLowering::ArgListEntry Entry;
  29     Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
  30     Entry.Node = Dst; Args.push_back(Entry);
  31     Entry.Node = Src; Args.push_back(Entry);
  32     Entry.Node = Size; Args.push_back(Entry);
  33
  34     TargetLowering::CallLoweringInfo CLI(DAG);
  35     CLI.setDebugLoc(dl)
  36         .setChain(Chain)
  37         .setLibCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
  38                       Type::getVoidTy(*DAG.getContext()),
  39                       DAG.getExternalSymbol(
  40                           "__memcpy_4", TLI.getPointerTy(DAG.getDataLayout())),
  41                       std::move(Args))
  42         .setDiscardResult();
  43
  44     std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
  45     return CallResult.second;
  46   }
  47
  48   // Otherwise have the target-independent code call memcpy.
  49   return SDValue();
  50 }