LLVM  12.0.0git
Go to the documentation of this file.
1 //===-- HexagonSelectionDAGInfo.cpp - Hexagon SelectionDAG Info -----------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the HexagonSelectionDAGInfo class.
10 //
11 //===----------------------------------------------------------------------===//
13 #include "HexagonTargetMachine.h"
15 using namespace llvm;
17 #define DEBUG_TYPE "hexagon-selectiondag-info"
20  SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
21  SDValue Size, Align Alignment, bool isVolatile, bool AlwaysInline,
22  MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
23  ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
24  if (AlwaysInline || Alignment < Align(4) || !ConstantSize)
25  return SDValue();
27  uint64_t SizeVal = ConstantSize->getZExtValue();
28  if (SizeVal < 32 || (SizeVal % 8) != 0)
29  return SDValue();
31  // Special case aligned memcpys with size >= 32 bytes and a multiple of 8.
32  //
33  const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
36  Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
37  Entry.Node = Dst;
38  Args.push_back(Entry);
39  Entry.Node = Src;
40  Args.push_back(Entry);
41  Entry.Node = Size;
42  Args.push_back(Entry);
44  const char *SpecialMemcpyName =
45  "__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes";
46  const MachineFunction &MF = DAG.getMachineFunction();
47  bool LongCalls = MF.getSubtarget<HexagonSubtarget>().useLongCalls();
48  unsigned Flags = LongCalls ? HexagonII::HMOTF_ConstExtended : 0;
51  CLI.setDebugLoc(dl)
52  .setChain(Chain)
53  .setLibCallee(
57  SpecialMemcpyName, TLI.getPointerTy(DAG.getDataLayout()), Flags),
58  std::move(Args))
59  .setDiscardResult();
61  std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
62  return CallResult.second;
63 }
constexpr char Align[]
Key for Kernel::Arg::Metadata::mAlign.
LLVM_NODISCARD std::enable_if_t< !is_simple_type< Y >::value, typename cast_retty< X, const Y >::ret_type > dyn_cast(const Y &Val)
Definition: Casting.h:334
This class represents lattice values for constants.
Definition: AllocatorList.h:23
SDValue getTargetExternalSymbol(const char *Sym, EVT VT, unsigned TargetFlags=0)
virtual const TargetLowering * getTargetLowering() const
CallLoweringInfo & setDebugLoc(const SDLoc &dl)
CallLoweringInfo & setChain(SDValue InChain)
const DataLayout & getDataLayout() const
Definition: SelectionDAG.h:424
This class defines information used to lower LLVM code to legal SelectionDAG operators that the targe...
MachineFunction & getMachineFunction() const
Definition: SelectionDAG.h:421
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:789
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
static Type * getVoidTy(LLVMContext &C)
Definition: Type.cpp:170
SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src, SDValue Size, Align Alignment, bool isVolatile, bool AlwaysInline, MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const override
Emit target-specific code that performs a memcpy.
virtual 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...
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 struct is a compact representation of a valid (non-zero power of two) alignment.
Definition: Alignment.h:39
This is used to represent a portion of an LLVM function in a low-level Data Dependence DAG representa...
Definition: SelectionDAG.h:223
Wrapper class for IR location info (IR ordering and DebugLoc) to be passed into SDNode creation funct...
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:426
uint32_t Size
Definition: Profile.cpp:46
static bool isVolatile(Instruction *Inst)
uint64_t getZExtValue() const
Unlike LLVM values, Selection DAG nodes may return multiple values as the result of a computation...
LLVMContext * getContext() const
Definition: SelectionDAG.h:431
constexpr char Args[]
Key for Kernel::Metadata::mArgs.
CallLoweringInfo & setLibCallee(CallingConv::ID CC, Type *ResultType, SDValue Target, ArgListTy &&ArgsList)