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 #define DEBUG_TYPE "hexagon-selectiondag-info"
  15 #include "HexagonTargetMachine.h"
  16 using namespace llvm;
  17
  18 bool llvm::flag_aligned_memcpy;
  19
  20 HexagonSelectionDAGInfo::HexagonSelectionDAGInfo(const HexagonTargetMachine
  21                                                  &TM)
  22   : TargetSelectionDAGInfo(TM) {
  23 }
  24
  25 HexagonSelectionDAGInfo::~HexagonSelectionDAGInfo() {
  26 }
  27
  28 SDValue
  29 HexagonSelectionDAGInfo::
  30 EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl, SDValue Chain,
  31                         SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
  32                         bool isVolatile, bool AlwaysInline,
  33                         MachinePointerInfo DstPtrInfo,
  34                         MachinePointerInfo SrcPtrInfo) const {
  35   flag_aligned_memcpy = false;
  36   if ((Align & 0x3) == 0) {
  37     ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
  38     if (ConstantSize) {
  39       uint64_t SizeVal = ConstantSize->getZExtValue();
  40       if ((SizeVal > 32) && ((SizeVal % 8) == 0))
  41         flag_aligned_memcpy = true;
  42     }
  43   }
  44
  45   return SDValue();
  46 }