HexagonSelectionDAGInfo.cpp revision 263508 
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"
16using namespace llvm;
17
18bool llvm::flag_aligned_memcpy;
19
20HexagonSelectionDAGInfo::HexagonSelectionDAGInfo(const HexagonTargetMachine
21                                                 &TM)
22  : TargetSelectionDAGInfo(TM) {
23}
24
25HexagonSelectionDAGInfo::~HexagonSelectionDAGInfo() {
26}
27
28SDValue
29HexagonSelectionDAGInfo::
30EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc 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}
47