//===-- ARMISelLowering.h - ARM DAG Lowering Interface ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that ARM uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef ARMISELLOWERING_H
#define ARMISELLOWERING_H
#include "MCTargetDesc/ARMBaseInfo.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetLowering.h"
#include <vector>
namespace llvm {
class ARMConstantPoolValue;
class ARMSubtarget;
namespace ARMISD {
// ARM Specific DAG Nodes
enum NodeType {
// Start the numbering where the builtin ops and target ops leave off.
FIRST_NUMBER = ISD::BUILTIN_OP_END,
Wrapper, // Wrapper - A wrapper node for TargetConstantPool,
// TargetExternalSymbol, and TargetGlobalAddress.
WrapperPIC, // WrapperPIC - A wrapper node for TargetGlobalAddress in
// PIC mode.
WrapperJT, // WrapperJT - A wrapper node for TargetJumpTable
// Add pseudo op to model memcpy for struct byval.
COPY_STRUCT_BYVAL,
CALL, // Function call.
CALL_PRED, // Function call that's predicable.
CALL_NOLINK, // Function call with branch not branch-and-link.
tCALL, // Thumb function call.
BRCOND, // Conditional branch.
BR_JT, // Jumptable branch.
BR2_JT, // Jumptable branch (2 level - jumptable entry is a jump).
RET_FLAG, // Return with a flag operand.
INTRET_FLAG, // Interrupt return with an LR-offset and a flag operand.
PIC_ADD, // Add with a PC operand and a PIC label.
CMP, // ARM compare instructions.
CMN, // ARM CMN instructions.
CMPZ, // ARM compare that sets only Z flag.
CMPFP, // ARM VFP compare instruction, sets FPSCR.
CMPFPw0, // ARM VFP compare against zero instruction, sets FPSCR.
FMSTAT, // ARM fmstat instruction.
CMOV, // ARM conditional move instructions.
BCC_i64,
RBIT, // ARM bitreverse instruction
FTOSI, // FP to sint within a FP register.
FTOUI, // FP to uint within a FP register.
SITOF, // sint to FP within a FP register.
UITOF, // uint to FP within a FP register.
SRL_FLAG, // V,Flag = srl_flag X -> srl X, 1 + save carry out.
SRA_FLAG, // V,Flag = sra_flag X -> sra X, 1 + save carry out.
RRX, // V = RRX X, Flag -> srl X, 1 + shift in carry flag.
ADDC, // Add with carry
ADDE, // Add using carry
SUBC, // Sub with carry
SUBE, // Sub using carry
VMOVRRD, // double to two gprs.
VMOVDRR, // Two gprs to double.
EH_SJLJ_SETJMP, // SjLj exception handling setjmp.
EH_SJLJ_LONGJMP, // SjLj exception handling longjmp.
TC_RETURN, // Tail call return pseudo.
THREAD_POINTER,
DYN_ALLOC, // Dynamic allocation on the stack.
MEMBARRIER_MCR, // Memory barrier (MCR)
PRELOAD, // Preload
WIN__CHKSTK, // Windows' __chkstk call to do stack probing.
VCEQ, // Vector compare equal.
VCEQZ, // Vector compare equal to zero.
VCGE, // Vector compare greater than or equal.
VCGEZ, // Vector compare greater than or equal to zero.
VCLEZ, // Vector compare less than or equal to zero.
VCGEU, // Vector compare unsigned greater than or equal.
VCGT, // Vector compare greater than.
VCGTZ, // Vector compare greater than zero.
VCLTZ, // Vector compare less than zero.
VCGTU, // Vector compare unsigned greater than.
VTST, // Vector test bits.
// Vector shift by immediate:
VSHL, // ...left
VSHRs, // ...right (signed)
VSHRu, // ...right (unsigned)
// Vector rounding shift by immediate:
VRSHRs, // ...right (signed)
VRSHRu, // ...right (unsigned)
VRSHRN, // ...right narrow
// Vector saturating shift by immediate:
VQSHLs, // ...left (signed)
VQSHLu, // ...left (unsigned)
VQSHLsu, // ...left (signed to unsigned)
VQSHRNs, // ...right narrow (signed)
VQSHRNu, // ...right narrow (unsigned)
VQSHRNsu, // ...right narrow (signed to unsigned)
// Vector saturating rounding shift by immediate:
VQRSHRNs, // ...right narrow (signed)
VQRSHRNu, // ...right narrow (unsigned)
VQRSHRNsu, // ...right narrow (signed to unsigned)
// Vector shift and insert:
VSLI, // ...left
VSRI, // ...right
// Vector get lane (VMOV scalar to ARM core register)
// (These are used for 8- and 16-bit element types only.)
VGETLANEu, // zero-extend vector extract element
VGETLANEs, // sign-extend vector extract element
// Vector move immediate and move negated immediate:
VMOVIMM,
VMVNIMM,
// Vector move f32 immediate:
VMOVFPIMM,
// Vector duplicate:
VDUP,
VDUPLANE,
// Vector shuffles:
VEXT, // extract
VREV64, // reverse elements within 64-bit doublewords
VREV32, // reverse elements within 32-bit words
VREV16, // reverse elements within 16-bit halfwords
VZIP, // zip (interleave)
VUZP, // unzip (deinterleave)
VTRN, // transpose
VTBL1, // 1-register shuffle with mask
VTBL2, // 2-register shuffle with mask
// Vector multiply long:
VMULLs, // ...signed
VMULLu, // ...unsigned
UMLAL, // 64bit Unsigned Accumulate Multiply
SMLAL, // 64bit Signed Accumulate Multiply
// Operands of the standard BUILD_VECTOR node are not legalized, which
// is fine if BUILD_VECTORs are always lowered to shuffles or other
// operations, but for ARM some BUILD_VECTORs are legal as-is and their
// operands need to be legalized. Define an ARM-specific version of
// BUILD_VECTOR for this purpose.
BUILD_VECTOR,
// Floating-point max and min:
FMAX,
FMIN,
VMAXNM,
VMINNM,
// Bit-field insert
BFI,
// Vector OR with immediate
VORRIMM,
// Vector AND with NOT of immediate
VBICIMM,
// Vector bitwise select
VBSL,
// Vector load N-element structure to all lanes:
VLD2DUP = ISD::FIRST_TARGET_MEMORY_OPCODE,
VLD3DUP,
VLD4DUP,
// NEON loads with post-increment base updates:
VLD1_UPD,
VLD2_UPD,
VLD3_UPD,
VLD4_UPD,
VLD2LN_UPD,
VLD3LN_UPD,
VLD4LN_UPD,
VLD2DUP_UPD,
VLD3DUP_UPD,
VLD4DUP_UPD,
// NEON stores with post-increment base updates:
VST1_UPD,
VST2_UPD,
VST3_UPD,
VST4_UPD,
VST2LN_UPD,
VST3LN_UPD,
VST4LN_UPD
};
}
/// Define some predicates that are used for node matching.
namespace ARM {
bool isBitFieldInvertedMask(unsigned v);
}
//===--------------------------------------------------------------------===//
// ARMTargetLowering - ARM Implementation of the TargetLowering interface
class ARMTargetLowering : public TargetLowering {
public:
explicit ARMTargetLowering(TargetMachine &TM);
unsigned getJumpTableEncoding() const override;
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
/// ReplaceNodeResults - Replace the results of node with an illegal result
/// type with new values built out of custom code.
///
void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG) const override;
const char *getTargetNodeName(unsigned Opcode) const override;
bool isSelectSupported(SelectSupportKind Kind) const override {
// ARM does not support scalar condition selects on vectors.
return (Kind != ScalarCondVectorVal);
}
/// getSetCCResultType - Return the value type to use for ISD::SETCC.
EVT getSetCCResultType(LLVMContext &Context, EVT VT) const override;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *MBB) const override;
void AdjustInstrPostInstrSelection(MachineInstr *MI,
SDNode *Node) const override;
SDValue PerformCMOVCombine(SDNode *N, SelectionDAG &DAG) const;
SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
bool isDesirableToTransformToIntegerOp(unsigned Opc, EVT VT) const override;
/// allowsUnalignedMemoryAccesses - Returns true if the target allows
/// unaligned memory accesses of the specified type. Returns whether it
/// is "fast" by reference in the second argument.
bool allowsUnalignedMemoryAccesses(EVT VT, unsigned AddrSpace,
bool *Fast) const override;
EVT getOptimalMemOpType(uint64_t Size,
unsigned DstAlign, unsigned SrcAlign,
bool IsMemset, bool ZeroMemset,
bool MemcpyStrSrc,
MachineFunction &MF) const override;
using TargetLowering::isZExtFree;
bool isZExtFree(SDValue Val, EVT VT2) const override;
bool allowTruncateForTailCall(Type *Ty1, Type *Ty2) const override;
/// isLegalAddressingMode - Return true if the addressing mode represented
/// by AM is legal for this target, for a load/store of the specified type.
bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const override;
bool isLegalT2ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
/// isLegalICmpImmediate - Return true if the specified immediate is legal
/// icmp immediate, that is the target has icmp instructions which can
/// compare a register against the immediate without having to materialize
/// the immediate into a register.
bool isLegalICmpImmediate(int64_t Imm) const override;
/// isLegalAddImmediate - Return true if the specified immediate is legal
/// add immediate, that is the target has add instructions which can
/// add a register and the immediate without having to materialize
/// the immediate into a register.
bool isLegalAddImmediate(int64_t Imm) const override;
/// getPreIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if the node's address
/// can be legally represented as pre-indexed load / store address.
bool getPreIndexedAddressParts(SDNode *N, SDValue &Base, SDValue &Offset,
ISD::MemIndexedMode &AM,
SelectionDAG &DAG) const override;
/// getPostIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if this node can be
/// combined with a load / store to form a post-indexed load / store.
bool getPostIndexedAddressParts(SDNode *N, SDNode *Op, SDValue &Base,
SDValue &Offset, ISD::MemIndexedMode &AM,
SelectionDAG &DAG) const override;
void computeKnownBitsForTargetNode(const SDValue Op, APInt &KnownZero,
APInt &KnownOne,
const SelectionDAG &DAG,
unsigned Depth) const override;
bool ExpandInlineAsm(CallInst *CI) const override;
ConstraintType
getConstraintType(const std::string &Constraint) const override;
/// Examine constraint string and operand type and determine a weight value.
/// The operand object must already have been set up with the operand type.
ConstraintWeight getSingleConstraintMatchWeight(
AsmOperandInfo &info, const char *constraint) const override;
std::pair<unsigned, const TargetRegisterClass*>
getRegForInlineAsmConstraint(const std::string &Constraint,
MVT VT) const override;
/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
/// vector. If it is invalid, don't add anything to Ops. If hasMemory is
/// true it means one of the asm constraint of the inline asm instruction
/// being processed is 'm'.
void LowerAsmOperandForConstraint(SDValue Op, std::string &Constraint,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) const override;
const ARMSubtarget* getSubtarget() const {
return Subtarget;
}
/// getRegClassFor - Return the register class that should be used for the
/// specified value type.
const TargetRegisterClass *getRegClassFor(MVT VT) const override;
/// getMaximalGlobalOffset - Returns the maximal possible offset which can
/// be used for loads / stores from the global.
unsigned getMaximalGlobalOffset() const override;
/// Returns true if a cast between SrcAS and DestAS is a noop.
bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override {
// Addrspacecasts are always noops.
return true;
}
/// createFastISel - This method returns a target specific FastISel object,
/// or null if the target does not support "fast" ISel.
FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo) const override;
Sched::Preference getSchedulingPreference(SDNode *N) const override;
bool
isShuffleMaskLegal(const SmallVectorImpl<int> &M, EVT VT) const override;
bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
/// isFPImmLegal - Returns true if the target can instruction select the
/// specified FP immediate natively. If false, the legalizer will
/// materialize the FP immediate as a load from a constant pool.
bool isFPImmLegal(const APFloat &Imm, EVT VT) const override;
bool getTgtMemIntrinsic(IntrinsicInfo &Info,
const CallInst &I,
unsigned Intrinsic) const override;
/// \brief Returns true if it is beneficial to convert a load of a constant
/// to just the constant itself.
bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
Type *Ty) const override;
/// \brief Returns true if an argument of type Ty needs to be passed in a
/// contiguous block of registers in calling convention CallConv.
bool functionArgumentNeedsConsecutiveRegisters(
Type *Ty, CallingConv::ID CallConv, bool isVarArg) const override;
Value *emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
AtomicOrdering Ord) const override;
Value *emitStoreConditional(IRBuilder<> &Builder, Value *Val,
Value *Addr, AtomicOrdering Ord) const override;
bool shouldExpandAtomicInIR(Instruction *Inst) const override;
protected:
std::pair<const TargetRegisterClass*, uint8_t>
findRepresentativeClass(MVT VT) const override;
private:
/// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
/// make the right decision when generating code for different targets.
const ARMSubtarget *Subtarget;
const TargetRegisterInfo *RegInfo;
const InstrItineraryData *Itins;
/// ARMPCLabelIndex - Keep track of the number of ARM PC labels created.
///
unsigned ARMPCLabelIndex;
void addTypeForNEON(MVT VT, MVT PromotedLdStVT, MVT PromotedBitwiseVT);
void addDRTypeForNEON(MVT VT);
void addQRTypeForNEON(MVT VT);
std::pair<SDValue, SDValue> getARMXALUOOp(SDValue Op, SelectionDAG &DAG, SDValue &ARMcc) const;
typedef SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPassVector;
void PassF64ArgInRegs(SDLoc dl, SelectionDAG &DAG,
SDValue Chain, SDValue &Arg,
RegsToPassVector &RegsToPass,
CCValAssign &VA, CCValAssign &NextVA,
SDValue &StackPtr,
SmallVectorImpl<SDValue> &MemOpChains,
ISD::ArgFlagsTy Flags) const;
SDValue GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
SDValue &Root, SelectionDAG &DAG,
SDLoc dl) const;
CallingConv::ID getEffectiveCallingConv(CallingConv::ID CC,
bool isVarArg) const;
CCAssignFn *CCAssignFnForNode(CallingConv::ID CC, bool Return,
bool isVarArg) const;
SDValue LowerMemOpCallTo(SDValue Chain, SDValue StackPtr, SDValue Arg,
SDLoc dl, SelectionDAG &DAG,
const CCValAssign &VA,
ISD::ArgFlagsTy Flags) const;
SDValue LowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *Subtarget) const;
SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressDarwin(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressELF(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressWindows(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
SelectionDAG &DAG) const;
SDValue LowerToTLSExecModels(GlobalAddressSDNode *GA,
SelectionDAG &DAG,
TLSModel::Model model) const;
SDValue LowerGLOBAL_OFFSET_TABLE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerShiftRightParts(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerConstantFP(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *ST) const;
SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *ST) const;
SDValue LowerFSINCOS(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerDivRem(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
unsigned getRegisterByName(const char* RegName, EVT VT) const override;
/// isFMAFasterThanFMulAndFAdd - Return true if an FMA operation is faster
/// than a pair of fmul and fadd instructions. fmuladd intrinsics will be
/// expanded to FMAs when this method returns true, otherwise fmuladd is
/// expanded to fmul + fadd.
///
/// ARM supports both fused and unfused multiply-add operations; we already
/// lower a pair of fmul and fadd to the latter so it's not clear that there
/// would be a gain or that the gain would be worthwhile enough to risk
/// correctness bugs.
bool isFMAFasterThanFMulAndFAdd(EVT VT) const override { return false; }
SDValue ReconstructShuffle(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals,
bool isThisReturn, SDValue ThisVal) const;
SDValue
LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const override;
int StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG,
SDLoc dl, SDValue &Chain,
const Value *OrigArg,
unsigned InRegsParamRecordIdx,
unsigned OffsetFromOrigArg,
unsigned ArgOffset,
unsigned ArgSize,
bool ForceMutable,
unsigned ByValStoreOffset,
unsigned TotalArgRegsSaveSize) const;
void VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
SDLoc dl, SDValue &Chain,
unsigned ArgOffset,
unsigned TotalArgRegsSaveSize,
bool ForceMutable = false) const;
void computeRegArea(CCState &CCInfo, MachineFunction &MF,
unsigned InRegsParamRecordIdx,
unsigned ArgSize,
unsigned &ArgRegsSize,
unsigned &ArgRegsSaveSize) const;
SDValue
LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
/// HandleByVal - Target-specific cleanup for ByVal support.
void HandleByVal(CCState *, unsigned &, unsigned) const override;
/// IsEligibleForTailCallOptimization - Check whether the call is eligible
/// for tail call optimization. Targets which want to do tail call
/// optimization should implement this function.
bool IsEligibleForTailCallOptimization(SDValue Callee,
CallingConv::ID CalleeCC,
bool isVarArg,
bool isCalleeStructRet,
bool isCallerStructRet,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
SelectionDAG& DAG) const;
bool CanLowerReturn(CallingConv::ID CallConv,
MachineFunction &MF, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context) const override;
SDValue
LowerReturn(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
SDLoc dl, SelectionDAG &DAG) const override;
bool isUsedByReturnOnly(SDNode *N, SDValue &Chain) const override;
bool mayBeEmittedAsTailCall(CallInst *CI) const override;
SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
SDValue &ARMcc, SelectionDAG &DAG, SDLoc dl) const;
SDValue getVFPCmp(SDValue LHS, SDValue RHS,
SelectionDAG &DAG, SDLoc dl) const;
SDValue duplicateCmp(SDValue Cmp, SelectionDAG &DAG) const;
SDValue OptimizeVFPBrcond(SDValue Op, SelectionDAG &DAG) const;
void SetupEntryBlockForSjLj(MachineInstr *MI,
MachineBasicBlock *MBB,
MachineBasicBlock *DispatchBB, int FI) const;
MachineBasicBlock *EmitSjLjDispatchBlock(MachineInstr *MI,
MachineBasicBlock *MBB) const;
bool RemapAddSubWithFlags(MachineInstr *MI, MachineBasicBlock *BB) const;
MachineBasicBlock *EmitStructByval(MachineInstr *MI,
MachineBasicBlock *MBB) const;
MachineBasicBlock *EmitLowered__chkstk(MachineInstr *MI,
MachineBasicBlock *MBB) const;
};
enum NEONModImmType {
VMOVModImm,
VMVNModImm,
OtherModImm
};
namespace ARM {
FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo);
}
}
#endif // ARMISELLOWERING_H