lib/Target/XCore/XCoreSelectionDAGInfo.cpp

   1 //===-- XCoreSelectionDAGInfo.cpp - XCore SelectionDAG Info ---------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the XCoreSelectionDAGInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "XCoreTargetMachine.h"
  15 using namespace llvm;
  16
  17 #define DEBUG_TYPE "xcore-selectiondag-info"
  18
  19 SDValue XCoreSelectionDAGInfo::EmitTargetCodeForMemcpy(
  20     SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
  21     SDValue Size, unsigned Align, bool isVolatile, bool AlwaysInline,
  22     MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
  23   unsigned SizeBitWidth = Size.getValueSizeInBits();
  24   // Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
  25   if (!AlwaysInline && (Align & 3) == 0 &&
  26       DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
  27     const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
  28     TargetLowering::ArgListTy Args;
  29     TargetLowering::ArgListEntry Entry;
  30     Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
  31     Entry.Node = Dst; Args.push_back(Entry);
  32     Entry.Node = Src; Args.push_back(Entry);
  33     Entry.Node = Size; Args.push_back(Entry);
  34
  35     TargetLowering::CallLoweringInfo CLI(DAG);
  36     CLI.setDebugLoc(dl)
  37         .setChain(Chain)
  38         .setLibCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
  39                       Type::getVoidTy(*DAG.getContext()),
  40                       DAG.getExternalSymbol(
  41                           "__memcpy_4", TLI.getPointerTy(DAG.getDataLayout())),
  42                       std::move(Args))
  43         .setDiscardResult();
  44
  45     std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
  46     return CallResult.second;
  47   }
  48
  49   // Otherwise have the target-independent code call memcpy.
  50   return SDValue();
  51 }