LLVM  6.0.0svn
XCoreSelectionDAGInfo.cpp
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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 
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();
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 
36  CLI.setDebugLoc(dl)
37  .setChain(Chain)
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 }
constexpr char Align[]
Key for Kernel::Arg::Metadata::mAlign.
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
virtual const TargetLowering * getTargetLowering() const
CallLoweringInfo & setDebugLoc(const SDLoc &dl)
unsigned getValueSizeInBits() const
Returns the size of the value in bits.
SDValue getExternalSymbol(const char *Sym, EVT VT)
CallLoweringInfo & setChain(SDValue InChain)
const DataLayout & getDataLayout() const
Definition: SelectionDAG.h:388
SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Op1, SDValue Op2, SDValue Op3, unsigned Align, bool isVolatile, bool AlwaysInline, MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const override
Emit target-specific code that performs a memcpy.
This class defines information used to lower LLVM code to legal SelectionDAG operators that the targe...
CallingConv::ID getLibcallCallingConv(RTLIB::Libcall Call) const
Get the CallingConv that should be used for the specified libcall.
IntegerType * getIntPtrType(LLVMContext &C, unsigned AddressSpace=0) const
Returns an integer type with size at least as big as that of a pointer in the given address space...
Definition: DataLayout.cpp:702
MVT getPointerTy(const DataLayout &DL, uint32_t AS=0) const
Return the pointer type for the given address space, defaults to the pointer type from the data layou...
static Type * getVoidTy(LLVMContext &C)
Definition: Type.cpp:161
std::vector< ArgListEntry > ArgListTy
This structure contains all information that is necessary for lowering calls.
This class contains a discriminated union of information about pointers in memory operands...
This is used to represent a portion of an LLVM function in a low-level Data Dependence DAG representa...
Definition: SelectionDAG.h:209
Wrapper class for IR location info (IR ordering and DebugLoc) to be passed into SDNode creation funct...
Class for arbitrary precision integers.
Definition: APInt.h:69
std::pair< SDValue, SDValue > LowerCallTo(CallLoweringInfo &CLI) const
This function lowers an abstract call to a function into an actual call.
const TargetSubtargetInfo & getSubtarget() const
Definition: SelectionDAG.h:390
bool MaskedValueIsZero(SDValue Op, const APInt &Mask, unsigned Depth=0) const
Return true if &#39;Op & Mask&#39; is known to be zero.
constexpr char Size[]
Key for Kernel::Arg::Metadata::mSize.
static bool isVolatile(Instruction *Inst)
Unlike LLVM values, Selection DAG nodes may return multiple values as the result of a computation...
LLVMContext * getContext() const
Definition: SelectionDAG.h:393
constexpr char Args[]
Key for Kernel::Metadata::mArgs.
CallLoweringInfo & setLibCallee(CallingConv::ID CC, Type *ResultType, SDValue Target, ArgListTy &&ArgsList)