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llvm-mirror/lib/Target/Hexagon/HexagonInstrInfo.h
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===- HexagonInstrInfo.h - Hexagon Instruction Information -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the Hexagon implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_HEXAGON_HEXAGONINSTRINFO_H
#define LLVM_LIB_TARGET_HEXAGON_HEXAGONINSTRINFO_H
#include "MCTargetDesc/HexagonBaseInfo.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/Support/MachineValueType.h"
#include <cstdint>
#include <vector>
#define GET_INSTRINFO_HEADER
#include "HexagonGenInstrInfo.inc"
namespace llvm {
class HexagonSubtarget;
class MachineBranchProbabilityInfo;
class MachineFunction;
class MachineInstr;
class MachineOperand;
class TargetRegisterInfo;
class HexagonInstrInfo : public HexagonGenInstrInfo {
const HexagonSubtarget &Subtarget;
enum BundleAttribute {
memShufDisabledMask = 0x4
};
virtual void anchor();
public:
explicit HexagonInstrInfo(HexagonSubtarget &ST);
/// TargetInstrInfo overrides.
/// If the specified machine instruction is a direct
/// load from a stack slot, return the virtual or physical register number of
/// the destination along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than loading from the stack slot.
unsigned isLoadFromStackSlot(const MachineInstr &MI,
int &FrameIndex) const override;
/// If the specified machine instruction is a direct
/// store to a stack slot, return the virtual or physical register number of
/// the source reg along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than storing to the stack slot.
unsigned isStoreToStackSlot(const MachineInstr &MI,
int &FrameIndex) const override;
/// Check if the instruction or the bundle of instructions has
/// load from stack slots. Return the frameindex and machine memory operand
/// if true.
bool hasLoadFromStackSlot(
const MachineInstr &MI,
SmallVectorImpl<const MachineMemOperand *> &Accesses) const override;
/// Check if the instruction or the bundle of instructions has
/// store to stack slots. Return the frameindex and machine memory operand
/// if true.
bool hasStoreToStackSlot(
const MachineInstr &MI,
SmallVectorImpl<const MachineMemOperand *> &Accesses) const override;
/// Analyze the branching code at the end of MBB, returning
/// true if it cannot be understood (e.g. it's a switch dispatch or isn't
/// implemented for a target). Upon success, this returns false and returns
/// with the following information in various cases:
///
/// 1. If this block ends with no branches (it just falls through to its succ)
/// just return false, leaving TBB/FBB null.
/// 2. If this block ends with only an unconditional branch, it sets TBB to be
/// the destination block.
/// 3. If this block ends with a conditional branch and it falls through to a
/// successor block, it sets TBB to be the branch destination block and a
/// list of operands that evaluate the condition. These operands can be
/// passed to other TargetInstrInfo methods to create new branches.
/// 4. If this block ends with a conditional branch followed by an
/// unconditional branch, it returns the 'true' destination in TBB, the
/// 'false' destination in FBB, and a list of operands that evaluate the
/// condition. These operands can be passed to other TargetInstrInfo
/// methods to create new branches.
///
/// Note that removeBranch and insertBranch must be implemented to support
/// cases where this method returns success.
///
/// If AllowModify is true, then this routine is allowed to modify the basic
/// block (e.g. delete instructions after the unconditional branch).
bool analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
SmallVectorImpl<MachineOperand> &Cond,
bool AllowModify) const override;
/// Remove the branching code at the end of the specific MBB.
/// This is only invoked in cases where AnalyzeBranch returns success. It
/// returns the number of instructions that were removed.
unsigned removeBranch(MachineBasicBlock &MBB,
int *BytesRemoved = nullptr) const override;
/// Insert branch code into the end of the specified MachineBasicBlock.
/// The operands to this method are the same as those
/// returned by AnalyzeBranch. This is only invoked in cases where
/// AnalyzeBranch returns success. It returns the number of instructions
/// inserted.
///
/// It is also invoked by tail merging to add unconditional branches in
/// cases where AnalyzeBranch doesn't apply because there was no original
/// branch to analyze. At least this much must be implemented, else tail
/// merging needs to be disabled.
unsigned insertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond,
const DebugLoc &DL,
int *BytesAdded = nullptr) const override;
/// Analyze the loop code, return true if it cannot be understood. Upon
/// success, this function returns false and returns information about the
/// induction variable and compare instruction used at the end.
bool analyzeLoop(MachineLoop &L, MachineInstr *&IndVarInst,
MachineInstr *&CmpInst) const override;
/// Generate code to reduce the loop iteration by one and check if the loop
/// is finished. Return the value/register of the new loop count. We need
/// this function when peeling off one or more iterations of a loop. This
/// function assumes the nth iteration is peeled first.
unsigned reduceLoopCount(MachineBasicBlock &MBB,
MachineInstr *IndVar, MachineInstr &Cmp,
SmallVectorImpl<MachineOperand> &Cond,
SmallVectorImpl<MachineInstr *> &PrevInsts,
unsigned Iter, unsigned MaxIter) const override;
/// Return true if it's profitable to predicate
/// instructions with accumulated instruction latency of "NumCycles"
/// of the specified basic block, where the probability of the instructions
/// being executed is given by Probability, and Confidence is a measure
/// of our confidence that it will be properly predicted.
bool isProfitableToIfCvt(MachineBasicBlock &MBB, unsigned NumCycles,
unsigned ExtraPredCycles,
BranchProbability Probability) const override;
/// Second variant of isProfitableToIfCvt. This one
/// checks for the case where two basic blocks from true and false path
/// of a if-then-else (diamond) are predicated on mutally exclusive
/// predicates, where the probability of the true path being taken is given
/// by Probability, and Confidence is a measure of our confidence that it
/// will be properly predicted.
bool isProfitableToIfCvt(MachineBasicBlock &TMBB,
unsigned NumTCycles, unsigned ExtraTCycles,
MachineBasicBlock &FMBB,
unsigned NumFCycles, unsigned ExtraFCycles,
BranchProbability Probability) const override;
/// Return true if it's profitable for if-converter to duplicate instructions
/// of specified accumulated instruction latencies in the specified MBB to
/// enable if-conversion.
/// The probability of the instructions being executed is given by
/// Probability, and Confidence is a measure of our confidence that it
/// will be properly predicted.
bool isProfitableToDupForIfCvt(MachineBasicBlock &MBB, unsigned NumCycles,
BranchProbability Probability) const override;
/// Emit instructions to copy a pair of physical registers.
///
/// This function should support copies within any legal register class as
/// well as any cross-class copies created during instruction selection.
///
/// The source and destination registers may overlap, which may require a
/// careful implementation when multiple copy instructions are required for
/// large registers. See for example the ARM target.
void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
const DebugLoc &DL, unsigned DestReg, unsigned SrcReg,
bool KillSrc) const override;
/// Store the specified register of the given register class to the specified
/// stack frame index. The store instruction is to be added to the given
/// machine basic block before the specified machine instruction. If isKill
/// is true, the register operand is the last use and must be marked kill.
void storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
unsigned SrcReg, bool isKill, int FrameIndex,
const TargetRegisterClass *RC,
const TargetRegisterInfo *TRI) const override;
/// Load the specified register of the given register class from the specified
/// stack frame index. The load instruction is to be added to the given
/// machine basic block before the specified machine instruction.
void loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
unsigned DestReg, int FrameIndex,
const TargetRegisterClass *RC,
const TargetRegisterInfo *TRI) const override;
/// This function is called for all pseudo instructions
/// that remain after register allocation. Many pseudo instructions are
/// created to help register allocation. This is the place to convert them
/// into real instructions. The target can edit MI in place, or it can insert
/// new instructions and erase MI. The function should return true if
/// anything was changed.
bool expandPostRAPseudo(MachineInstr &MI) const override;
/// Get the base register and byte offset of a load/store instr.
bool getMemOperandWithOffset(MachineInstr &LdSt, MachineOperand *&BaseOp,
int64_t &Offset,
const TargetRegisterInfo *TRI) const override;
/// Reverses the branch condition of the specified condition list,
/// returning false on success and true if it cannot be reversed.
bool reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond)
const override;
/// Insert a noop into the instruction stream at the specified point.
void insertNoop(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const override;
/// Returns true if the instruction is already predicated.
bool isPredicated(const MachineInstr &MI) const override;
/// Return true for post-incremented instructions.
bool isPostIncrement(const MachineInstr &MI) const override;
/// Convert the instruction into a predicated instruction.
/// It returns true if the operation was successful.
bool PredicateInstruction(MachineInstr &MI,
ArrayRef<MachineOperand> Cond) const override;
/// Returns true if the first specified predicate
/// subsumes the second, e.g. GE subsumes GT.
bool SubsumesPredicate(ArrayRef<MachineOperand> Pred1,
ArrayRef<MachineOperand> Pred2) const override;
/// If the specified instruction defines any predicate
/// or condition code register(s) used for predication, returns true as well
/// as the definition predicate(s) by reference.
bool DefinesPredicate(MachineInstr &MI,
std::vector<MachineOperand> &Pred) const override;
/// Return true if the specified instruction can be predicated.
/// By default, this returns true for every instruction with a
/// PredicateOperand.
bool isPredicable(const MachineInstr &MI) const override;
/// Test if the given instruction should be considered a scheduling boundary.
/// This primarily includes labels and terminators.
bool isSchedulingBoundary(const MachineInstr &MI,
const MachineBasicBlock *MBB,
const MachineFunction &MF) const override;
/// Measure the specified inline asm to determine an approximation of its
/// length.
unsigned getInlineAsmLength(const char *Str,
const MCAsmInfo &MAI) const override;
/// Allocate and return a hazard recognizer to use for this target when
/// scheduling the machine instructions after register allocation.
ScheduleHazardRecognizer*
CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II,
const ScheduleDAG *DAG) const override;
/// For a comparison instruction, return the source registers
/// in SrcReg and SrcReg2 if having two register operands, and the value it
/// compares against in CmpValue. Return true if the comparison instruction
/// can be analyzed.
bool analyzeCompare(const MachineInstr &MI, unsigned &SrcReg,
unsigned &SrcReg2, int &Mask, int &Value) const override;
/// Compute the instruction latency of a given instruction.
/// If the instruction has higher cost when predicated, it's returned via
/// PredCost.
unsigned getInstrLatency(const InstrItineraryData *ItinData,
const MachineInstr &MI,
unsigned *PredCost = nullptr) const override;
/// Create machine specific model for scheduling.
DFAPacketizer *
CreateTargetScheduleState(const TargetSubtargetInfo &STI) const override;
// Sometimes, it is possible for the target
// to tell, even without aliasing information, that two MIs access different
// memory addresses. This function returns true if two MIs access different
// memory addresses and false otherwise.
bool
areMemAccessesTriviallyDisjoint(MachineInstr &MIa, MachineInstr &MIb,
AliasAnalysis *AA = nullptr) const override;
/// For instructions with a base and offset, return the position of the
/// base register and offset operands.
bool getBaseAndOffsetPosition(const MachineInstr &MI, unsigned &BasePos,
unsigned &OffsetPos) const override;
/// If the instruction is an increment of a constant value, return the amount.
bool getIncrementValue(const MachineInstr &MI, int &Value) const override;
/// getOperandLatency - Compute and return the use operand latency of a given
/// pair of def and use.
/// In most cases, the static scheduling itinerary was enough to determine the
/// operand latency. But it may not be possible for instructions with variable
/// number of defs / uses.
///
/// This is a raw interface to the itinerary that may be directly overriden by
/// a target. Use computeOperandLatency to get the best estimate of latency.
int getOperandLatency(const InstrItineraryData *ItinData,
const MachineInstr &DefMI, unsigned DefIdx,
const MachineInstr &UseMI,
unsigned UseIdx) const override;
/// Decompose the machine operand's target flags into two values - the direct
/// target flag value and any of bit flags that are applied.
std::pair<unsigned, unsigned>
decomposeMachineOperandsTargetFlags(unsigned TF) const override;
/// Return an array that contains the direct target flag values and their
/// names.
///
/// MIR Serialization is able to serialize only the target flags that are
/// defined by this method.
ArrayRef<std::pair<unsigned, const char *>>
getSerializableDirectMachineOperandTargetFlags() const override;
/// Return an array that contains the bitmask target flag values and their
/// names.
///
/// MIR Serialization is able to serialize only the target flags that are
/// defined by this method.
ArrayRef<std::pair<unsigned, const char *>>
getSerializableBitmaskMachineOperandTargetFlags() const override;
bool isTailCall(const MachineInstr &MI) const override;
/// HexagonInstrInfo specifics.
unsigned createVR(MachineFunction *MF, MVT VT) const;
MachineInstr *findLoopInstr(MachineBasicBlock *BB, unsigned EndLoopOp,
MachineBasicBlock *TargetBB,
SmallPtrSet<MachineBasicBlock *, 8> &Visited) const;
bool isBaseImmOffset(const MachineInstr &MI) const;
bool isAbsoluteSet(const MachineInstr &MI) const;
bool isAccumulator(const MachineInstr &MI) const;
bool isAddrModeWithOffset(const MachineInstr &MI) const;
bool isComplex(const MachineInstr &MI) const;
bool isCompoundBranchInstr(const MachineInstr &MI) const;
bool isConstExtended(const MachineInstr &MI) const;
bool isDeallocRet(const MachineInstr &MI) const;
bool isDependent(const MachineInstr &ProdMI,
const MachineInstr &ConsMI) const;
bool isDotCurInst(const MachineInstr &MI) const;
bool isDotNewInst(const MachineInstr &MI) const;
bool isDuplexPair(const MachineInstr &MIa, const MachineInstr &MIb) const;
bool isEarlySourceInstr(const MachineInstr &MI) const;
bool isEndLoopN(unsigned Opcode) const;
bool isExpr(unsigned OpType) const;
bool isExtendable(const MachineInstr &MI) const;
bool isExtended(const MachineInstr &MI) const;
bool isFloat(const MachineInstr &MI) const;
bool isHVXMemWithAIndirect(const MachineInstr &I,
const MachineInstr &J) const;
bool isIndirectCall(const MachineInstr &MI) const;
bool isIndirectL4Return(const MachineInstr &MI) const;
bool isJumpR(const MachineInstr &MI) const;
bool isJumpWithinBranchRange(const MachineInstr &MI, unsigned offset) const;
bool isLateInstrFeedsEarlyInstr(const MachineInstr &LRMI,
const MachineInstr &ESMI) const;
bool isLateResultInstr(const MachineInstr &MI) const;
bool isLateSourceInstr(const MachineInstr &MI) const;
bool isLoopN(const MachineInstr &MI) const;
bool isMemOp(const MachineInstr &MI) const;
bool isNewValue(const MachineInstr &MI) const;
bool isNewValue(unsigned Opcode) const;
bool isNewValueInst(const MachineInstr &MI) const;
bool isNewValueJump(const MachineInstr &MI) const;
bool isNewValueJump(unsigned Opcode) const;
bool isNewValueStore(const MachineInstr &MI) const;
bool isNewValueStore(unsigned Opcode) const;
bool isOperandExtended(const MachineInstr &MI, unsigned OperandNum) const;
bool isPredicatedNew(const MachineInstr &MI) const;
bool isPredicatedNew(unsigned Opcode) const;
bool isPredicatedTrue(const MachineInstr &MI) const;
bool isPredicatedTrue(unsigned Opcode) const;
bool isPredicated(unsigned Opcode) const;
bool isPredicateLate(unsigned Opcode) const;
bool isPredictedTaken(unsigned Opcode) const;
bool isSaveCalleeSavedRegsCall(const MachineInstr &MI) const;
bool isSignExtendingLoad(const MachineInstr &MI) const;
bool isSolo(const MachineInstr &MI) const;
bool isSpillPredRegOp(const MachineInstr &MI) const;
bool isTC1(const MachineInstr &MI) const;
bool isTC2(const MachineInstr &MI) const;
bool isTC2Early(const MachineInstr &MI) const;
bool isTC4x(const MachineInstr &MI) const;
bool isToBeScheduledASAP(const MachineInstr &MI1,
const MachineInstr &MI2) const;
bool isHVXVec(const MachineInstr &MI) const;
bool isValidAutoIncImm(const EVT VT, const int Offset) const;
bool isValidOffset(unsigned Opcode, int Offset,
const TargetRegisterInfo *TRI, bool Extend = true) const;
bool isVecAcc(const MachineInstr &MI) const;
bool isVecALU(const MachineInstr &MI) const;
bool isVecUsableNextPacket(const MachineInstr &ProdMI,
const MachineInstr &ConsMI) const;
bool isZeroExtendingLoad(const MachineInstr &MI) const;
bool addLatencyToSchedule(const MachineInstr &MI1,
const MachineInstr &MI2) const;
bool canExecuteInBundle(const MachineInstr &First,
const MachineInstr &Second) const;
bool doesNotReturn(const MachineInstr &CallMI) const;
bool hasEHLabel(const MachineBasicBlock *B) const;
bool hasNonExtEquivalent(const MachineInstr &MI) const;
bool hasPseudoInstrPair(const MachineInstr &MI) const;
bool hasUncondBranch(const MachineBasicBlock *B) const;
bool mayBeCurLoad(const MachineInstr &MI) const;
bool mayBeNewStore(const MachineInstr &MI) const;
bool producesStall(const MachineInstr &ProdMI,
const MachineInstr &ConsMI) const;
bool producesStall(const MachineInstr &MI,
MachineBasicBlock::const_instr_iterator MII) const;
bool predCanBeUsedAsDotNew(const MachineInstr &MI, unsigned PredReg) const;
bool PredOpcodeHasJMP_c(unsigned Opcode) const;
bool predOpcodeHasNot(ArrayRef<MachineOperand> Cond) const;
unsigned getAddrMode(const MachineInstr &MI) const;
MachineOperand *getBaseAndOffset(const MachineInstr &MI, int64_t &Offset,
unsigned &AccessSize) const;
SmallVector<MachineInstr*,2> getBranchingInstrs(MachineBasicBlock& MBB) const;
unsigned getCExtOpNum(const MachineInstr &MI) const;
HexagonII::CompoundGroup
getCompoundCandidateGroup(const MachineInstr &MI) const;
unsigned getCompoundOpcode(const MachineInstr &GA,
const MachineInstr &GB) const;
int getCondOpcode(int Opc, bool sense) const;
int getDotCurOp(const MachineInstr &MI) const;
int getNonDotCurOp(const MachineInstr &MI) const;
int getDotNewOp(const MachineInstr &MI) const;
int getDotNewPredJumpOp(const MachineInstr &MI,
const MachineBranchProbabilityInfo *MBPI) const;
int getDotNewPredOp(const MachineInstr &MI,
const MachineBranchProbabilityInfo *MBPI) const;
int getDotOldOp(const MachineInstr &MI) const;
HexagonII::SubInstructionGroup getDuplexCandidateGroup(const MachineInstr &MI)
const;
short getEquivalentHWInstr(const MachineInstr &MI) const;
unsigned getInstrTimingClassLatency(const InstrItineraryData *ItinData,
const MachineInstr &MI) const;
bool getInvertedPredSense(SmallVectorImpl<MachineOperand> &Cond) const;
unsigned getInvertedPredicatedOpcode(const int Opc) const;
int getMaxValue(const MachineInstr &MI) const;
unsigned getMemAccessSize(const MachineInstr &MI) const;
int getMinValue(const MachineInstr &MI) const;
short getNonExtOpcode(const MachineInstr &MI) const;
bool getPredReg(ArrayRef<MachineOperand> Cond, unsigned &PredReg,
unsigned &PredRegPos, unsigned &PredRegFlags) const;
short getPseudoInstrPair(const MachineInstr &MI) const;
short getRegForm(const MachineInstr &MI) const;
unsigned getSize(const MachineInstr &MI) const;
uint64_t getType(const MachineInstr &MI) const;
unsigned getUnits(const MachineInstr &MI) const;
MachineBasicBlock::instr_iterator expandVGatherPseudo(MachineInstr &MI) const;
/// getInstrTimingClassLatency - Compute the instruction latency of a given
/// instruction using Timing Class information, if available.
unsigned nonDbgBBSize(const MachineBasicBlock *BB) const;
unsigned nonDbgBundleSize(MachineBasicBlock::const_iterator BundleHead) const;
void immediateExtend(MachineInstr &MI) const;
bool invertAndChangeJumpTarget(MachineInstr &MI,
MachineBasicBlock *NewTarget) const;
void genAllInsnTimingClasses(MachineFunction &MF) const;
bool reversePredSense(MachineInstr &MI) const;
unsigned reversePrediction(unsigned Opcode) const;
bool validateBranchCond(const ArrayRef<MachineOperand> &Cond) const;
void setBundleNoShuf(MachineBasicBlock::instr_iterator MIB) const;
bool getBundleNoShuf(const MachineInstr &MIB) const;
// Addressing mode relations.
short changeAddrMode_abs_io(short Opc) const;
short changeAddrMode_io_abs(short Opc) const;
short changeAddrMode_io_pi(short Opc) const;
short changeAddrMode_io_rr(short Opc) const;
short changeAddrMode_pi_io(short Opc) const;
short changeAddrMode_rr_io(short Opc) const;
short changeAddrMode_rr_ur(short Opc) const;
short changeAddrMode_ur_rr(short Opc) const;
short changeAddrMode_abs_io(const MachineInstr &MI) const {
return changeAddrMode_abs_io(MI.getOpcode());
}
short changeAddrMode_io_abs(const MachineInstr &MI) const {
return changeAddrMode_io_abs(MI.getOpcode());
}
short changeAddrMode_io_rr(const MachineInstr &MI) const {
return changeAddrMode_io_rr(MI.getOpcode());
}
short changeAddrMode_rr_io(const MachineInstr &MI) const {
return changeAddrMode_rr_io(MI.getOpcode());
}
short changeAddrMode_rr_ur(const MachineInstr &MI) const {
return changeAddrMode_rr_ur(MI.getOpcode());
}
short changeAddrMode_ur_rr(const MachineInstr &MI) const {
return changeAddrMode_ur_rr(MI.getOpcode());
}
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_HEXAGON_HEXAGONINSTRINFO_H
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