//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#ifndef LLVM_TARGET_TARGETINSTRINFO_H
#define LLVM_TARGET_TARGETINSTRINFO_H
-#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/Target/TargetInstrDesc.h"
#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/Support/DataTypes.h"
-#include <vector>
-#include <cassert>
namespace llvm {
-class MachineInstr;
-class TargetMachine;
-class MachineCodeForInstruction;
class TargetRegisterClass;
class LiveVariables;
+class CalleeSavedInfo;
+class SDNode;
+class SelectionDAG;
-//---------------------------------------------------------------------------
-// Data types used to define information about a single machine instruction
-//---------------------------------------------------------------------------
-
-typedef short MachineOpCode;
-typedef unsigned InstrSchedClass;
-
-//---------------------------------------------------------------------------
-// struct TargetInstrDescriptor:
-// Predefined information about each machine instruction.
-// Designed to initialized statically.
-//
-
-const unsigned M_BRANCH_FLAG = 1 << 0;
-const unsigned M_CALL_FLAG = 1 << 1;
-const unsigned M_RET_FLAG = 1 << 2;
-const unsigned M_BARRIER_FLAG = 1 << 3;
-const unsigned M_DELAY_SLOT_FLAG = 1 << 4;
-const unsigned M_LOAD_FLAG = 1 << 5;
-const unsigned M_STORE_FLAG = 1 << 6;
-const unsigned M_INDIRECT_FLAG = 1 << 7;
-
-// M_CONVERTIBLE_TO_3_ADDR - This is a 2-address instruction which can be
-// changed into a 3-address instruction if the first two operands cannot be
-// assigned to the same register. The target must implement the
-// TargetInstrInfo::convertToThreeAddress method for this instruction.
-const unsigned M_CONVERTIBLE_TO_3_ADDR = 1 << 7;
-
-// This M_COMMUTABLE - is a 2- or 3-address instruction (of the form X = op Y,
-// Z), which produces the same result if Y and Z are exchanged.
-const unsigned M_COMMUTABLE = 1 << 8;
-
-// M_TERMINATOR_FLAG - Is this instruction part of the terminator for a basic
-// block? Typically this is things like return and branch instructions.
-// Various passes use this to insert code into the bottom of a basic block, but
-// before control flow occurs.
-const unsigned M_TERMINATOR_FLAG = 1 << 9;
-
-// M_USES_CUSTOM_DAG_SCHED_INSERTION - Set if this instruction requires custom
-// insertion support when the DAG scheduler is inserting it into a machine basic
-// block.
-const unsigned M_USES_CUSTOM_DAG_SCHED_INSERTION = 1 << 10;
-
-// M_VARIABLE_OPS - Set if this instruction can have a variable number of extra
-// operands in addition to the minimum number operands specified.
-const unsigned M_VARIABLE_OPS = 1 << 11;
-
-// M_PREDICABLE - Set if this instruction has a predicate operand that
-// controls execution. It may be set to 'always'.
-const unsigned M_PREDICABLE = 1 << 12;
-
-// M_REMATERIALIZIBLE - Set if this instruction can be trivally re-materialized
-// at any time, e.g. constant generation, load from constant pool.
-const unsigned M_REMATERIALIZIBLE = 1 << 13;
-
-// M_NOT_DUPLICABLE - Set if this instruction cannot be safely duplicated.
-// (e.g. instructions with unique labels attached).
-const unsigned M_NOT_DUPLICABLE = 1 << 14;
-
-// M_HAS_OPTIONAL_DEF - Set if this instruction has an optional definition, e.g.
-// ARM instructions which can set condition code if 's' bit is set.
-const unsigned M_HAS_OPTIONAL_DEF = 1 << 15;
-
-// Machine operand flags
-// M_LOOK_UP_PTR_REG_CLASS - Set if this operand is a pointer value and it
-// requires a callback to look up its register class.
-const unsigned M_LOOK_UP_PTR_REG_CLASS = 1 << 0;
-
-/// M_PREDICATE_OPERAND - Set if this is one of the operands that made up of the
-/// predicate operand that controls an M_PREDICATED instruction.
-const unsigned M_PREDICATE_OPERAND = 1 << 1;
-
-/// M_OPTIONAL_DEF_OPERAND - Set if this operand is a optional def.
-///
-const unsigned M_OPTIONAL_DEF_OPERAND = 1 << 2;
-
-namespace TOI {
- // Operand constraints: only "tied_to" for now.
- enum OperandConstraint {
- TIED_TO = 0 // Must be allocated the same register as.
- };
-}
-
-/// TargetOperandInfo - This holds information about one operand of a machine
-/// instruction, indicating the register class for register operands, etc.
-///
-class TargetOperandInfo {
-public:
- /// RegClass - This specifies the register class enumeration of the operand
- /// if the operand is a register. If not, this contains 0.
- unsigned short RegClass;
- unsigned short Flags;
- /// Lower 16 bits are used to specify which constraints are set. The higher 16
- /// bits are used to specify the value of constraints (4 bits each).
- unsigned int Constraints;
- /// Currently no other information.
-};
-
-
-class TargetInstrDescriptor {
-public:
- MachineOpCode Opcode; // The opcode.
- unsigned short numOperands; // Num of args (may be more if variable_ops).
- unsigned short numDefs; // Num of args that are definitions.
- const char * Name; // Assembly language mnemonic for the opcode.
- InstrSchedClass schedClass; // enum identifying instr sched class
- unsigned Flags; // flags identifying machine instr class
- unsigned TSFlags; // Target Specific Flag values
- const unsigned *ImplicitUses; // Registers implicitly read by this instr
- const unsigned *ImplicitDefs; // Registers implicitly defined by this instr
- const TargetOperandInfo *OpInfo; // 'numOperands' entries about operands.
-
- /// getOperandConstraint - Returns the value of the specific constraint if
- /// it is set. Returns -1 if it is not set.
- int getOperandConstraint(unsigned OpNum,
- TOI::OperandConstraint Constraint) const {
- assert((OpNum < numOperands || (Flags & M_VARIABLE_OPS)) &&
- "Invalid operand # of TargetInstrInfo");
- if (OpNum < numOperands &&
- (OpInfo[OpNum].Constraints & (1 << Constraint))) {
- unsigned Pos = 16 + Constraint * 4;
- return (int)(OpInfo[OpNum].Constraints >> Pos) & 0xf;
- }
- return -1;
- }
-
- /// findTiedToSrcOperand - Returns the operand that is tied to the specified
- /// dest operand. Returns -1 if there isn't one.
- int findTiedToSrcOperand(unsigned OpNum) const;
-};
+template<class T> class SmallVectorImpl;
//---------------------------------------------------------------------------
/// TargetInstrInfo - Interface to description of machine instructions
///
class TargetInstrInfo {
- const TargetInstrDescriptor* desc; // raw array to allow static init'n
- unsigned NumOpcodes; // number of entries in the desc array
- unsigned numRealOpCodes; // number of non-dummy op codes
+ const TargetInstrDesc *Descriptors; // Raw array to allow static init'n
+ unsigned NumOpcodes; // Number of entries in the desc array
TargetInstrInfo(const TargetInstrInfo &); // DO NOT IMPLEMENT
void operator=(const TargetInstrInfo &); // DO NOT IMPLEMENT
public:
- TargetInstrInfo(const TargetInstrDescriptor *desc, unsigned NumOpcodes);
+ TargetInstrInfo(const TargetInstrDesc *desc, unsigned NumOpcodes);
virtual ~TargetInstrInfo();
// Invariant opcodes: All instruction sets have these as their low opcodes.
PHI = 0,
INLINEASM = 1,
LABEL = 2,
- EXTRACT_SUBREG = 3,
- INSERT_SUBREG = 4
+ DECLARE = 3,
+ EXTRACT_SUBREG = 4,
+ INSERT_SUBREG = 5,
+ IMPLICIT_DEF = 6,
+ SUBREG_TO_REG = 7
};
unsigned getNumOpcodes() const { return NumOpcodes; }
/// get - Return the machine instruction descriptor that corresponds to the
/// specified instruction opcode.
///
- const TargetInstrDescriptor& get(MachineOpCode Opcode) const {
- assert((unsigned)Opcode < NumOpcodes);
- return desc[Opcode];
- }
-
- const char *getName(MachineOpCode Opcode) const {
- return get(Opcode).Name;
- }
-
- int getNumOperands(MachineOpCode Opcode) const {
- return get(Opcode).numOperands;
- }
-
- int getNumDefs(MachineOpCode Opcode) const {
- return get(Opcode).numDefs;
- }
-
- InstrSchedClass getSchedClass(MachineOpCode Opcode) const {
- return get(Opcode).schedClass;
- }
-
- const unsigned *getImplicitUses(MachineOpCode Opcode) const {
- return get(Opcode).ImplicitUses;
- }
-
- const unsigned *getImplicitDefs(MachineOpCode Opcode) const {
- return get(Opcode).ImplicitDefs;
- }
-
-
- //
- // Query instruction class flags according to the machine-independent
- // flags listed above.
- //
- bool isReturn(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_RET_FLAG;
- }
-
- bool isCommutableInstr(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_COMMUTABLE;
- }
- bool isTerminatorInstr(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_TERMINATOR_FLAG;
- }
-
- bool isBranch(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_BRANCH_FLAG;
- }
-
- bool isIndirectBranch(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_INDIRECT_FLAG;
- }
-
- /// isBarrier - Returns true if the specified instruction stops control flow
- /// from executing the instruction immediately following it. Examples include
- /// unconditional branches and return instructions.
- bool isBarrier(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_BARRIER_FLAG;
- }
-
- bool isCall(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_CALL_FLAG;
- }
- bool isLoad(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_LOAD_FLAG;
- }
- bool isStore(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_STORE_FLAG;
- }
-
- /// hasDelaySlot - Returns true if the specified instruction has a delay slot
- /// which must be filled by the code generator.
- bool hasDelaySlot(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_DELAY_SLOT_FLAG;
- }
-
- /// usesCustomDAGSchedInsertionHook - Return true if this instruction requires
- /// custom insertion support when the DAG scheduler is inserting it into a
- /// machine basic block.
- bool usesCustomDAGSchedInsertionHook(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_USES_CUSTOM_DAG_SCHED_INSERTION;
- }
-
- bool hasVariableOperands(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_VARIABLE_OPS;
- }
-
- bool isPredicable(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_PREDICABLE;
- }
-
- bool isNotDuplicable(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_NOT_DUPLICABLE;
- }
-
- bool hasOptionalDef(MachineOpCode Opcode) const {
- return get(Opcode).Flags & M_HAS_OPTIONAL_DEF;
+ const TargetInstrDesc &get(unsigned Opcode) const {
+ assert(Opcode < NumOpcodes && "Invalid opcode!");
+ return Descriptors[Opcode];
}
/// isTriviallyReMaterializable - Return true if the instruction is trivially
/// rematerializable, meaning it has no side effects and requires no operands
/// that aren't always available.
- bool isTriviallyReMaterializable(MachineInstr *MI) const {
- return (MI->getInstrDescriptor()->Flags & M_REMATERIALIZIBLE) &&
+ bool isTriviallyReMaterializable(const MachineInstr *MI) const {
+ return MI->getDesc().isRematerializable() &&
isReallyTriviallyReMaterializable(MI);
}
/// return false if the instruction has any side effects other than
/// producing a value, or if it requres any address registers that are not
/// always available.
- virtual bool isReallyTriviallyReMaterializable(MachineInstr *MI) const {
+ virtual bool isReallyTriviallyReMaterializable(const MachineInstr *MI) const {
return true;
}
public:
- /// getOperandConstraint - Returns the value of the specific constraint if
- /// it is set. Returns -1 if it is not set.
- int getOperandConstraint(MachineOpCode Opcode, unsigned OpNum,
- TOI::OperandConstraint Constraint) const {
- return get(Opcode).getOperandConstraint(OpNum, Constraint);
- }
-
/// Return true if the instruction is a register to register move
/// and leave the source and dest operands in the passed parameters.
virtual bool isMoveInstr(const MachineInstr& MI,
return 0;
}
+ /// reMaterialize - Re-issue the specified 'original' instruction at the
+ /// specific location targeting a new destination register.
+ virtual void reMaterialize(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned DestReg,
+ const MachineInstr *Orig) const = 0;
+
+ /// isInvariantLoad - Return true if the specified instruction (which is
+ /// marked mayLoad) is loading from a location whose value is invariant across
+ /// the function. For example, loading a value from the constant pool or from
+ /// from the argument area of a function if it does not change. This should
+ /// only return true of *all* loads the instruction does are invariant (if it
+ /// does multiple loads).
+ virtual bool isInvariantLoad(MachineInstr *MI) const {
+ return false;
+ }
+
/// convertToThreeAddress - This method must be implemented by targets that
/// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
/// may be able to convert a two-address instruction into one or more true
/// return a new machine instruction. If an instruction cannot commute, it
/// can also return null.
///
- virtual MachineInstr *commuteInstruction(MachineInstr *MI) const;
+ /// If NewMI is true, then a new machine instruction must be created.
+ ///
+ virtual MachineInstr *commuteInstruction(MachineInstr *MI,
+ bool NewMI = false) const = 0;
+
+ /// CommuteChangesDestination - Return true if commuting the specified
+ /// instruction will also changes the destination operand. Also return the
+ /// current operand index of the would be new destination register by
+ /// reference. This can happen when the commutable instruction is also a
+ /// two-address instruction.
+ virtual bool CommuteChangesDestination(MachineInstr *MI,
+ unsigned &OpIdx) const = 0;
/// AnalyzeBranch - 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
return 0;
}
+ /// copyRegToReg - Add a copy between a pair of registers
+ virtual void copyRegToReg(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned DestReg, unsigned SrcReg,
+ const TargetRegisterClass *DestRC,
+ const TargetRegisterClass *SrcRC) const {
+ assert(0 && "Target didn't implement TargetInstrInfo::copyRegToReg!");
+ }
+
+ virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned SrcReg, bool isKill, int FrameIndex,
+ const TargetRegisterClass *RC) const {
+ assert(0 && "Target didn't implement TargetInstrInfo::storeRegToStackSlot!");
+ }
+
+ virtual void storeRegToAddr(MachineFunction &MF, unsigned SrcReg, bool isKill,
+ SmallVectorImpl<MachineOperand> &Addr,
+ const TargetRegisterClass *RC,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const {
+ assert(0 && "Target didn't implement TargetInstrInfo::storeRegToAddr!");
+ }
+
+ virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned DestReg, int FrameIndex,
+ const TargetRegisterClass *RC) const {
+ assert(0 && "Target didn't implement TargetInstrInfo::loadRegFromStackSlot!");
+ }
+
+ virtual void loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
+ SmallVectorImpl<MachineOperand> &Addr,
+ const TargetRegisterClass *RC,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const {
+ assert(0 && "Target didn't implement TargetInstrInfo::loadRegFromAddr!");
+ }
+
+ /// spillCalleeSavedRegisters - Issues instruction(s) to spill all callee
+ /// saved registers and returns true if it isn't possible / profitable to do
+ /// so by issuing a series of store instructions via
+ /// storeRegToStackSlot(). Returns false otherwise.
+ virtual bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ const std::vector<CalleeSavedInfo> &CSI) const {
+ return false;
+ }
+
+ /// restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee
+ /// saved registers and returns true if it isn't possible / profitable to do
+ /// so by issuing a series of load instructions via loadRegToStackSlot().
+ /// Returns false otherwise.
+ virtual bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ const std::vector<CalleeSavedInfo> &CSI) const {
+ return false;
+ }
+
+ /// foldMemoryOperand - Attempt to fold a load or store of the specified stack
+ /// slot into the specified machine instruction for the specified operand(s).
+ /// If this is possible, a new instruction is returned with the specified
+ /// operand folded, otherwise NULL is returned. The client is responsible for
+ /// removing the old instruction and adding the new one in the instruction
+ /// stream.
+ virtual MachineInstr* foldMemoryOperand(MachineFunction &MF,
+ MachineInstr* MI,
+ SmallVectorImpl<unsigned> &Ops,
+ int FrameIndex) const {
+ return 0;
+ }
+
+ /// foldMemoryOperand - Same as the previous version except it allows folding
+ /// of any load and store from / to any address, not just from a specific
+ /// stack slot.
+ virtual MachineInstr* foldMemoryOperand(MachineFunction &MF,
+ MachineInstr* MI,
+ SmallVectorImpl<unsigned> &Ops,
+ MachineInstr* LoadMI) const {
+ return 0;
+ }
+
+ /// canFoldMemoryOperand - Returns true if the specified load / store is
+ /// folding is possible.
+ virtual
+ bool canFoldMemoryOperand(MachineInstr *MI,
+ SmallVectorImpl<unsigned> &Ops) const{
+ return false;
+ }
+
+ /// unfoldMemoryOperand - Separate a single instruction which folded a load or
+ /// a store or a load and a store into two or more instruction. If this is
+ /// possible, returns true as well as the new instructions by reference.
+ virtual bool unfoldMemoryOperand(MachineFunction &MF, MachineInstr *MI,
+ unsigned Reg, bool UnfoldLoad, bool UnfoldStore,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const{
+ return false;
+ }
+
+ virtual bool unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
+ SmallVectorImpl<SDNode*> &NewNodes) const {
+ return false;
+ }
+
+ /// getOpcodeAfterMemoryUnfold - Returns the opcode of the would be new
+ /// instruction after load / store are unfolded from an instruction of the
+ /// specified opcode. It returns zero if the specified unfolding is not
+ /// possible.
+ virtual unsigned getOpcodeAfterMemoryUnfold(unsigned Opc,
+ bool UnfoldLoad, bool UnfoldStore) const {
+ return 0;
+ }
+
/// BlockHasNoFallThrough - Return true if the specified block does not
/// fall-through into its successor block. This is primarily used when a
/// branch is unanalyzable. It is useful for things like unconditional
/// instruction. It returns true if the operation was successful.
virtual
bool PredicateInstruction(MachineInstr *MI,
- const std::vector<MachineOperand> &Pred) const;
+ const std::vector<MachineOperand> &Pred) const = 0;
/// SubsumesPredicate - Returns true if the first specified predicate
/// subsumes the second, e.g. GE subsumes GT.
abort();
return 0; // Must return a value in order to compile with VS 2005
}
+
+ /// GetInstSize - Returns the size of the specified Instruction.
+ ///
+ virtual unsigned GetInstSizeInBytes(const MachineInstr *MI) const {
+ assert(0 && "Target didn't implement TargetInstrInfo::GetInstSize!");
+ return 0;
+ }
+
+ /// GetFunctionSizeInBytes - Returns the size of the specified MachineFunction.
+ ///
+ virtual unsigned GetFunctionSizeInBytes(const MachineFunction &MF) const = 0;
+
+};
+
+/// TargetInstrInfoImpl - This is the default implementation of
+/// TargetInstrInfo, which just provides a couple of default implementations
+/// for various methods. This separated out because it is implemented in
+/// libcodegen, not in libtarget.
+class TargetInstrInfoImpl : public TargetInstrInfo {
+protected:
+ TargetInstrInfoImpl(const TargetInstrDesc *desc, unsigned NumOpcodes)
+ : TargetInstrInfo(desc, NumOpcodes) {}
+public:
+ virtual MachineInstr *commuteInstruction(MachineInstr *MI,
+ bool NewMI = false) const;
+ virtual bool CommuteChangesDestination(MachineInstr *MI,
+ unsigned &OpIdx) const;
+ virtual bool PredicateInstruction(MachineInstr *MI,
+ const std::vector<MachineOperand> &Pred) const;
+ virtual void reMaterialize(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned DestReg,
+ const MachineInstr *Orig) const;
+ virtual unsigned GetFunctionSizeInBytes(const MachineFunction &MF) const;
};
} // End llvm namespace
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