//
//===----------------------------------------------------------------------===//
//
-// This file describes the target machine instructions to the code generator.
+// This file describes the target machine instruction set to the code generator.
//
//===----------------------------------------------------------------------===//
#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 {
template<class T> class SmallVectorImpl;
-//===----------------------------------------------------------------------===//
-// Machine Operand Flags and Description
-//===----------------------------------------------------------------------===//
-
-namespace TOI {
- // Operand constraints: only "tied_to" for now.
- enum OperandConstraint {
- TIED_TO = 0 // Must be allocated the same register as.
- };
-
- /// OperandFlags - These are flags set on operands, but should be considered
- /// private, all access should go through the TargetOperandInfo accessors.
- /// See the accessors for a description of what these are.
- enum OperandFlags {
- LookupPtrRegClass = 0,
- Predicate,
- OptionalDef
- };
-}
-
-/// 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.
-
- /// isLookupPtrRegClass - Set if this operand is a pointer value and it
- /// requires a callback to look up its register class.
- bool isLookupPtrRegClass() const { return Flags&(1 <<TOI::LookupPtrRegClass);}
-
- /// isPredicate - Set if this is one of the operands that made up of
- /// the predicate operand that controls an isPredicable() instruction.
- bool isPredicate() const { return Flags & (1 << TOI::Predicate); }
-
- /// isOptionalDef - Set if this operand is a optional def.
- ///
- bool isOptionalDef() const { return Flags & (1 << TOI::OptionalDef); }
-};
-
-
-//===----------------------------------------------------------------------===//
-// Machine Instruction Flags and Description
-//===----------------------------------------------------------------------===//
-
-/// TargetInstrDescriptor flags - These should be considered private to the
-/// implementation of the TargetInstrDescriptor class. Clients should use the
-/// predicate methods on TargetInstrDescriptor, not use these directly. These
-/// all correspond to bitfields in the TargetInstrDescriptor::Flags field.
-namespace TID {
- enum {
- Variadic = 0,
- HasOptionalDef,
- Return,
- Call,
- ImplicitDef,
- Barrier,
- Terminator,
- Branch,
- IndirectBranch,
- Predicable,
- NotDuplicable,
- DelaySlot,
- SimpleLoad,
- MayStore,
- NeverHasSideEffects,
- MayHaveSideEffects,
- Commutable,
- ConvertibleTo3Addr,
- UsesCustomDAGSchedInserter,
- Rematerializable
- };
-}
-
-/// TargetInstrDescriptor - Describe properties that are true of each
-/// instruction in the target description file. This captures information about
-/// side effects, register use and many other things. There is one instance of
-/// this struct for each target instruction class, and the MachineInstr class
-/// points to this struct directly to describe itself.
-class TargetInstrDescriptor {
-public:
- unsigned short Opcode; // The opcode number.
- unsigned short NumOperands; // Num of args (may be more if variable_ops)
- unsigned short NumDefs; // Num of args that are definitions.
- unsigned short SchedClass; // enum identifying instr sched class
- const char * Name; // Name of the instruction record in td file.
- 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 || isVariadic()) &&
- "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;
-
- /// getName - Return the name of the record in the .td file for this
- /// instruction, for example "ADD8ri".
- const char *getName() const {
- return Name;
- }
-
- /// getNumOperands - Return the number of declared MachineOperands for this
- /// MachineInstruction. Note that variadic (isVariadic() returns true)
- /// instructions may have additional operands at the end of the list, and note
- /// that the machine instruction may include implicit register def/uses as
- /// well.
- unsigned getNumOperands() const {
- return NumOperands;
- }
-
- /// getNumDefs - Return the number of MachineOperands that are register
- /// definitions. Register definitions always occur at the start of the
- /// machine operand list. This is the number of "outs" in the .td file.
- unsigned getNumDefs() const {
- return NumDefs;
- }
-
- /// isVariadic - Return true if this instruction can have a variable number of
- /// operands. In this case, the variable operands will be after the normal
- /// operands but before the implicit definitions and uses (if any are
- /// present).
- bool isVariadic() const {
- return Flags & (1 << TID::Variadic);
- }
-
- /// hasOptionalDef - Set if this instruction has an optional definition, e.g.
- /// ARM instructions which can set condition code if 's' bit is set.
- bool hasOptionalDef() const {
- return Flags & (1 << TID::HasOptionalDef);
- }
-
- /// getImplicitUses - Return a list of machine operands that are potentially
- /// read by any instance of this machine instruction. For example, on X86,
- /// the "adc" instruction adds two register operands and adds the carry bit in
- /// from the flags register. In this case, the instruction is marked as
- /// implicitly reading the flags. Likewise, the variable shift instruction on
- /// X86 is marked as implicitly reading the 'CL' register, which it always
- /// does.
- ///
- /// This method returns null if the instruction has no implicit uses.
- const unsigned *getImplicitUses() const {
- return ImplicitUses;
- }
-
- /// getImplicitDefs - Return a list of machine operands that are potentially
- /// written by any instance of this machine instruction. For example, on X86,
- /// many instructions implicitly set the flags register. In this case, they
- /// are marked as setting the FLAGS. Likewise, many instructions always
- /// deposit their result in a physical register. For example, the X86 divide
- /// instruction always deposits the quotient and remainder in the EAX/EDX
- /// registers. For that instruction, this will return a list containing the
- /// EAX/EDX/EFLAGS registers.
- ///
- /// This method returns null if the instruction has no implicit uses.
- const unsigned *getImplicitDefs() const {
- return ImplicitDefs;
- }
-
- /// getSchedClass - Return the scheduling class for this instruction. The
- /// scheduling class is an index into the InstrItineraryData table. This
- /// returns zero if there is no known scheduling information for the
- /// instruction.
- ///
- unsigned getSchedClass() const {
- return SchedClass;
- }
-
- bool isReturn() const {
- return Flags & (1 << TID::Return);
- }
-
- bool isCall() const {
- return Flags & (1 << TID::Call);
- }
-
- /// isImplicitDef - Return true if this is an "IMPLICIT_DEF" instruction,
- /// which defines a register to an unspecified value. These basically
- /// correspond to x = undef.
- bool isImplicitDef() const {
- return Flags & (1 << TID::ImplicitDef);
- }
-
- /// 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() const {
- return Flags & (1 << TID::Barrier);
- }
-
- /// isTerminator - Returns true if 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.
- bool isTerminator() const {
- return Flags & (1 << TID::Terminator);
- }
-
- /// isBranch - Returns true if this is a conditional, unconditional, or
- /// indirect branch. Predicates below can be used to discriminate between
- /// these cases, and the TargetInstrInfo::AnalyzeBranch method can be used to
- /// get more information.
- bool isBranch() const {
- return Flags & (1 << TID::Branch);
- }
-
- /// isIndirectBranch - Return true if this is an indirect branch, such as a
- /// branch through a register.
- bool isIndirectBranch() const {
- return Flags & (1 << TID::IndirectBranch);
- }
-
- /// isConditionalBranch - Return true if this is a branch which may fall
- /// through to the next instruction or may transfer control flow to some other
- /// block. The TargetInstrInfo::AnalyzeBranch method can be used to get more
- /// information about this branch.
- bool isConditionalBranch() const {
- return isBranch() & !isBarrier() & !isIndirectBranch();
- }
-
- /// isUnconditionalBranch - Return true if this is a branch which always
- /// transfers control flow to some other block. The
- /// TargetInstrInfo::AnalyzeBranch method can be used to get more information
- /// about this branch.
- bool isUnconditionalBranch() const {
- return isBranch() & isBarrier() & !isIndirectBranch();
- }
-
- // isPredicable - Return true if this instruction has a predicate operand that
- // controls execution. It may be set to 'always', or may be set to other
- /// values. There are various methods in TargetInstrInfo that can be used to
- /// control and modify the predicate in this instruction.
- bool isPredicable() const {
- return Flags & (1 << TID::Predicable);
- }
-
- /// isNotDuplicable - Return true if this instruction cannot be safely
- /// duplicated. For example, if the instruction has a unique labels attached
- /// to it, duplicating it would cause multiple definition errors.
- bool isNotDuplicable() const {
- return Flags & (1 << TID::NotDuplicable);
- }
-
- /// hasDelaySlot - Returns true if the specified instruction has a delay slot
- /// which must be filled by the code generator.
- bool hasDelaySlot() const {
- return Flags & (1 << TID::DelaySlot);
- }
-
- /// isSimpleLoad - Return true for instructions that are simple loads from
- /// memory. This should only be set on instructions that load a value from
- /// memory and return it in their only virtual register definition.
- /// Instructions that return a value loaded from memory and then modified in
- /// some way should not return true for this.
- bool isSimpleLoad() const {
- return Flags & (1 << TID::SimpleLoad);
- }
-
- //===--------------------------------------------------------------------===//
- // Side Effect Analysis
- //===--------------------------------------------------------------------===//
-
- /// mayStore - Return true if this instruction could possibly modify memory.
- /// Instructions with this flag set are not necessarily simple store
- /// instructions, they may store a modified value based on their operands, or
- /// may not actually modify anything, for example.
- bool mayStore() const {
- return Flags & (1 << TID::MayStore);
- }
-
- // TODO: mayLoad.
-
- /// hasNoSideEffects - Return true if all instances of this instruction are
- /// guaranteed to have no side effects other than:
- /// 1. The register operands that are def/used by the MachineInstr.
- /// 2. Registers that are implicitly def/used by the MachineInstr.
- /// 3. Memory Accesses captured by mayLoad() or mayStore().
- ///
- /// Examples of other side effects would be calling a function, modifying
- /// 'invisible' machine state like a control register, etc.
- ///
- /// If some instances of this instruction are side-effect free but others are
- /// not, the hasConditionalSideEffects() property should return true, not this
- /// one.
- ///
- /// Note that you should not call this method directly, instead, call the
- /// TargetInstrInfo::hasUnmodelledSideEffects method, which handles analysis
- /// of the machine instruction.
- bool hasNoSideEffects() const {
- return Flags & (1 << TID::NeverHasSideEffects);
- }
-
- /// hasConditionalSideEffects - Return true if some instances of this
- /// instruction are guaranteed to have no side effects other than those listed
- /// for hasNoSideEffects(). To determine whether a specific machineinstr has
- /// side effects, the TargetInstrInfo::isReallySideEffectFree virtual method
- /// is invoked to decide.
- ///
- /// Note that you should not call this method directly, instead, call the
- /// TargetInstrInfo::hasUnmodelledSideEffects method, which handles analysis
- /// of the machine instruction.
- bool hasConditionalSideEffects() const {
- return Flags & (1 << TID::MayHaveSideEffects);
- }
-
- //===--------------------------------------------------------------------===//
- // Flags that indicate whether an instruction can be modified by a method.
- //===--------------------------------------------------------------------===//
-
- /// isCommutable - Return true if this may be a 2- or 3-address
- /// instruction (of the form "X = op Y, Z, ..."), which produces the same
- /// result if Y and Z are exchanged. If this flag is set, then the
- /// TargetInstrInfo::commuteInstruction method may be used to hack on the
- /// instruction.
- ///
- /// Note that this flag may be set on instructions that are only commutable
- /// sometimes. In these cases, the call to commuteInstruction will fail.
- /// Also note that some instructions require non-trivial modification to
- /// commute them.
- bool isCommutable() const {
- return Flags & (1 << TID::Commutable);
- }
-
- /// isConvertibleTo3Addr - Return true if this is a 2-address instruction
- /// which can be changed into a 3-address instruction if needed. Doing this
- /// transformation can be profitable in the register allocator, because it
- /// means that the instruction can use a 2-address form if possible, but
- /// degrade into a less efficient form if the source and dest register cannot
- /// be assigned to the same register. For example, this allows the x86
- /// backend to turn a "shl reg, 3" instruction into an LEA instruction, which
- /// is the same speed as the shift but has bigger code size.
- ///
- /// If this returns true, then the target must implement the
- /// TargetInstrInfo::convertToThreeAddress method for this instruction, which
- /// is allowed to fail if the transformation isn't valid for this specific
- /// instruction (e.g. shl reg, 4 on x86).
- ///
- bool isConvertibleTo3Addr() const {
- return Flags & (1 << TID::ConvertibleTo3Addr);
- }
-
- /// usesCustomDAGSchedInsertionHook - Return true if this instruction requires
- /// custom insertion support when the DAG scheduler is inserting it into a
- /// machine basic block. If this is true for the instruction, it basically
- /// means that it is a pseudo instruction used at SelectionDAG time that is
- /// expanded out into magic code by the target when MachineInstrs are formed.
- ///
- /// If this is true, the TargetLoweringInfo::InsertAtEndOfBasicBlock method
- /// is used to insert this into the MachineBasicBlock.
- bool usesCustomDAGSchedInsertionHook() const {
- return Flags & (1 << TID::UsesCustomDAGSchedInserter);
- }
-
- /// isRematerializable - Returns true if this instruction is a candidate for
- /// remat. This flag is deprecated, please don't use it anymore. If this
- /// flag is set, the isReallyTriviallyReMaterializable() method is called to
- /// verify the instruction is really rematable.
- bool isRematerializable() const {
- return Flags & (1 << TID::Rematerializable);
- }
-};
-
//---------------------------------------------------------------------------
///
-/// TargetInstrInfo - Interface to description of machine instructions
+/// TargetInstrInfo - Interface to description of machine instruction set
///
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.
enum {
PHI = 0,
INLINEASM = 1,
- LABEL = 2,
- EXTRACT_SUBREG = 3,
- INSERT_SUBREG = 4
+ DBG_LABEL = 2,
+ EH_LABEL = 3,
+ GC_LABEL = 4,
+ DECLARE = 5,
+
+ /// EXTRACT_SUBREG - This instruction takes two operands: a register
+ /// that has subregisters, and a subregister index. It returns the
+ /// extracted subregister value. This is commonly used to implement
+ /// truncation operations on target architectures which support it.
+ EXTRACT_SUBREG = 6,
+
+ /// INSERT_SUBREG - This instruction takes three operands: a register
+ /// that has subregisters, a register providing an insert value, and a
+ /// subregister index. It returns the value of the first register with
+ /// the value of the second register inserted. The first register is
+ /// often defined by an IMPLICIT_DEF, as is commonly used to implement
+ /// anyext operations on target architectures which support it.
+ INSERT_SUBREG = 7,
+
+ /// IMPLICIT_DEF - This is the MachineInstr-level equivalent of undef.
+ IMPLICIT_DEF = 8,
+
+ /// SUBREG_TO_REG - This instruction is similar to INSERT_SUBREG except
+ /// that the first operand is an immediate integer constant. This constant
+ /// is often zero, as is commonly used to implement zext operations on
+ /// target architectures which support it, such as with x86-64 (with
+ /// zext from i32 to i64 via implicit zero-extension).
+ SUBREG_TO_REG = 9,
+
+ /// COPY_TO_REGCLASS - This instruction is a placeholder for a plain
+ /// register-to-register copy into a specific register class. This is only
+ /// used between instruction selection and MachineInstr creation, before
+ /// virtual registers have been created for all the instructions, and it's
+ /// only needed in cases where the register classes implied by the
+ /// instructions are insufficient. The actual MachineInstrs to perform
+ /// the copy are emitted with the TargetInstrInfo::copyRegToReg hook.
+ COPY_TO_REGCLASS = 10
};
unsigned getNumOpcodes() const { return NumOpcodes; }
/// get - Return the machine instruction descriptor that corresponds to the
/// specified instruction opcode.
///
- const TargetInstrDescriptor& get(unsigned Opcode) const {
- assert(Opcode < NumOpcodes);
- return desc[Opcode];
+ 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->getDesc()->isRematerializable() &&
+ bool isTriviallyReMaterializable(const MachineInstr *MI) const {
+ return MI->getDesc().isRematerializable() &&
isReallyTriviallyReMaterializable(MI);
}
- /// hasUnmodelledSideEffects - Returns true if the instruction has side
- /// effects that are not captured by any operands of the instruction or other
- /// flags.
- bool hasUnmodelledSideEffects(MachineInstr *MI) const {
- const TargetInstrDescriptor *TID = MI->getDesc();
- if (TID->hasNoSideEffects()) return false;
- if (!TID->hasConditionalSideEffects()) return true;
- return !isReallySideEffectFree(MI); // May have side effects
- }
protected:
/// isReallyTriviallyReMaterializable - For instructions with opcodes for
/// which the M_REMATERIALIZABLE flag is set, this function tests whether the
/// 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;
}
- /// isReallySideEffectFree - If the M_MAY_HAVE_SIDE_EFFECTS flag is set, this
- /// method is called to determine if the specific instance of this
- /// instruction has side effects. This is useful in cases of instructions,
- /// like loads, which generally always have side effects. A load from a
- /// constant pool doesn't have side effects, though. So we need to
- /// differentiate it from the general case.
- virtual bool isReallySideEffectFree(MachineInstr *MI) const {
- return false;
- }
public:
- /// getOperandConstraint - Returns the value of the specific constraint if
- /// it is set. Returns -1 if it is not set.
- int getOperandConstraint(unsigned 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.
+ /// Return true if the instruction is a register to register move and return
+ /// the source and dest operands and their sub-register indices by reference.
virtual bool isMoveInstr(const MachineInstr& MI,
- unsigned& sourceReg,
- unsigned& destReg) const {
+ unsigned& SrcReg, unsigned& DstReg,
+ unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
return false;
}
/// 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.
- virtual unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const{
+ virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
+ int &FrameIndex) const {
return 0;
}
/// 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.
- virtual unsigned isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const {
+ virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
+ int &FrameIndex) const {
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(const 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
///
virtual MachineInstr *
convertToThreeAddress(MachineFunction::iterator &MFI,
- MachineBasicBlock::iterator &MBBI, LiveVariables &LV) const {
+ MachineBasicBlock::iterator &MBBI, LiveVariables *LV) const {
return 0;
}
/// return a new machine instruction. If an instruction cannot commute, it
/// can also return null.
///
- virtual MachineInstr *commuteInstruction(MachineInstr *MI) const = 0;
+ /// 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
/// 2. If this block ends with only an unconditional branch, it sets TBB to be
/// the destination block.
/// 3. If this block ends with an conditional branch and it falls through to
- /// an successor block, it sets TBB to be the branch destination block and a
- /// list of operands that evaluate the condition. These
+ /// an 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 an conditional branch and an unconditional
- /// block, 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.
+ /// block, 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).
+ ///
virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
- std::vector<MachineOperand> &Cond) const {
+ SmallVectorImpl<MachineOperand> &Cond,
+ bool AllowModify = false) const {
return true;
}
/// RemoveBranch - Remove the branching code at the end of the specific MBB.
- /// this is only invoked in cases where AnalyzeBranch returns success. It
+ /// This is only invoked in cases where AnalyzeBranch returns success. It
/// returns the number of instructions that were removed.
virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const {
assert(0 && "Target didn't implement TargetInstrInfo::RemoveBranch!");
/// returns success and when an unconditional branch (TBB is non-null, FBB is
/// null, Cond is empty) needs to be inserted. 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.
virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
- const std::vector<MachineOperand> &Cond) const {
+ const SmallVectorImpl<MachineOperand> &Cond) const {
assert(0 && "Target didn't implement TargetInstrInfo::InsertBranch!");
return 0;
}
- /// copyRegToReg - Add a copy between a pair of registers
- virtual void copyRegToReg(MachineBasicBlock &MBB,
+ /// copyRegToReg - Emit instructions to copy between a pair of registers. It
+ /// returns false if the target does not how to copy between the specified
+ /// registers.
+ virtual bool 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!");
+ return false;
}
+ /// storeRegToStackSlot - 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.
virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill, int FrameIndex,
assert(0 && "Target didn't implement TargetInstrInfo::storeRegToStackSlot!");
}
+ /// storeRegToAddr - Store the specified register of the given register class
+ /// to the specified address. 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.
virtual void storeRegToAddr(MachineFunction &MF, unsigned SrcReg, bool isKill,
SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC,
assert(0 && "Target didn't implement TargetInstrInfo::storeRegToAddr!");
}
+ /// loadRegFromStackSlot - 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.
virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, int FrameIndex,
assert(0 && "Target didn't implement TargetInstrInfo::loadRegFromStackSlot!");
}
+ /// loadRegFromAddr - Load the specified register of the given register class
+ /// class from the specified address. The load instruction is to be added to
+ /// the given machine basic block before the specified machine instruction.
virtual void loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC,
/// 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(MachineInstr* MI,
- SmallVectorImpl<unsigned> &Ops,
- int FrameIndex) const {
- return 0;
- }
+ MachineInstr* foldMemoryOperand(MachineFunction &MF,
+ MachineInstr* MI,
+ const SmallVectorImpl<unsigned> &Ops,
+ int FrameIndex) const;
/// 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(MachineInstr* MI,
- SmallVectorImpl<unsigned> &Ops,
- MachineInstr* LoadMI) const {
+ MachineInstr* foldMemoryOperand(MachineFunction &MF,
+ MachineInstr* MI,
+ const SmallVectorImpl<unsigned> &Ops,
+ MachineInstr* LoadMI) const;
+
+protected:
+ /// foldMemoryOperandImpl - Target-dependent implementation for
+ /// foldMemoryOperand. Target-independent code in foldMemoryOperand will
+ /// take care of adding a MachineMemOperand to the newly created instruction.
+ virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
+ MachineInstr* MI,
+ const SmallVectorImpl<unsigned> &Ops,
+ int FrameIndex) const {
return 0;
}
- /// canFoldMemoryOperand - Returns true if the specified load / store is
+ /// foldMemoryOperandImpl - Target-dependent implementation for
+ /// foldMemoryOperand. Target-independent code in foldMemoryOperand will
+ /// take care of adding a MachineMemOperand to the newly created instruction.
+ virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
+ MachineInstr* MI,
+ const SmallVectorImpl<unsigned> &Ops,
+ MachineInstr* LoadMI) const {
+ return 0;
+ }
+
+public:
+ /// canFoldMemoryOperand - Returns true for the specified load / store if
/// folding is possible.
virtual
- bool canFoldMemoryOperand(MachineInstr *MI,
- SmallVectorImpl<unsigned> &Ops) const{
+ bool canFoldMemoryOperand(const MachineInstr *MI,
+ const SmallVectorImpl<unsigned> &Ops) const {
return false;
}
/// fall-through into its successor block. This is primarily used when a
/// branch is unanalyzable. It is useful for things like unconditional
/// indirect branches (jump tables).
- virtual bool BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
+ virtual bool BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
return false;
}
/// ReverseBranchCondition - Reverses the branch condition of the specified
/// condition list, returning false on success and true if it cannot be
/// reversed.
- virtual bool ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
+ virtual
+ bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
return true;
}
/// instruction. It returns true if the operation was successful.
virtual
bool PredicateInstruction(MachineInstr *MI,
- const std::vector<MachineOperand> &Pred) const = 0;
+ const SmallVectorImpl<MachineOperand> &Pred) const = 0;
/// SubsumesPredicate - Returns true if the first specified predicate
/// subsumes the second, e.g. GE subsumes GT.
virtual
- bool SubsumesPredicate(const std::vector<MachineOperand> &Pred1,
- const std::vector<MachineOperand> &Pred2) const {
+ bool SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
+ const SmallVectorImpl<MachineOperand> &Pred2) const {
return false;
}
return false;
}
- /// getPointerRegClass - Returns a TargetRegisterClass used for pointer
- /// values.
- virtual const TargetRegisterClass *getPointerRegClass() const {
- assert(0 && "Target didn't implement getPointerRegClass!");
- abort();
- return 0; // Must return a value in order to compile with VS 2005
+ /// isSafeToMoveRegClassDefs - Return true if it's safe to move a machine
+ /// instruction that defines the specified register class.
+ virtual bool isSafeToMoveRegClassDefs(const TargetRegisterClass *RC) const {
+ return true;
+ }
+
+ /// 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
/// libcodegen, not in libtarget.
class TargetInstrInfoImpl : public TargetInstrInfo {
protected:
- TargetInstrInfoImpl(const TargetInstrDescriptor *desc, unsigned NumOpcodes)
+ TargetInstrInfoImpl(const TargetInstrDesc *desc, unsigned NumOpcodes)
: TargetInstrInfo(desc, NumOpcodes) {}
public:
- virtual MachineInstr *commuteInstruction(MachineInstr *MI) const;
+ 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;
-
+ const SmallVectorImpl<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
projects / oota-llvm.git / blobdiff