src/llvm/lib/Target/Hexagon/HexagonSelectionDAGInfo.cpp

   1 //===-- HexagonSelectionDAGInfo.cpp - Hexagon 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 HexagonSelectionDAGInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "HexagonTargetMachine.h"
  15 using namespace llvm;
  16
  17 #define DEBUG_TYPE "hexagon-selectiondag-info"
  18
  19 bool llvm::flag_aligned_memcpy;
  20
  21 HexagonSelectionDAGInfo::HexagonSelectionDAGInfo(const DataLayout &DL)
  22     : TargetSelectionDAGInfo(&DL) {}
  23
  24 HexagonSelectionDAGInfo::~HexagonSelectionDAGInfo() {
  25 }
  26
  27 SDValue
  28 HexagonSelectionDAGInfo::
  29 EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl, SDValue Chain,
  30                         SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
  31                         bool isVolatile, bool AlwaysInline,
  32                         MachinePointerInfo DstPtrInfo,
  33                         MachinePointerInfo SrcPtrInfo) const {
  34   flag_aligned_memcpy = false;
  35   if ((Align & 0x3) == 0) {
  36     ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
  37     if (ConstantSize) {
  38       uint64_t SizeVal = ConstantSize->getZExtValue();
  39       if ((SizeVal > 32) && ((SizeVal % 8) == 0))
  40         flag_aligned_memcpy = true;
  41     }
  42   }
  43
  44   return SDValue();
  45 }