mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-22 23:31:32 +00:00
34dcc6fadc
doesn't have to guess. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103194 91177308-0d34-0410-b5e6-96231b3b80d8
597 lines
27 KiB
C++
597 lines
27 KiB
C++
//===-- llvm/Target/TargetInstrInfo.h - Instruction Info --------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file describes the target machine instruction set to the code generator.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_TARGET_TARGETINSTRINFO_H
|
|
#define LLVM_TARGET_TARGETINSTRINFO_H
|
|
|
|
#include "llvm/Target/TargetInstrDesc.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
|
|
namespace llvm {
|
|
|
|
class CalleeSavedInfo;
|
|
class LiveVariables;
|
|
class MCAsmInfo;
|
|
class MachineMemOperand;
|
|
class MDNode;
|
|
class MCInst;
|
|
class SDNode;
|
|
class SelectionDAG;
|
|
class TargetRegisterClass;
|
|
class TargetRegisterInfo;
|
|
|
|
template<class T> class SmallVectorImpl;
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
///
|
|
/// TargetInstrInfo - Interface to description of machine instruction set
|
|
///
|
|
class TargetInstrInfo {
|
|
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 TargetInstrDesc *desc, unsigned NumOpcodes);
|
|
virtual ~TargetInstrInfo();
|
|
|
|
unsigned getNumOpcodes() const { return NumOpcodes; }
|
|
|
|
/// get - Return the machine instruction descriptor that corresponds to the
|
|
/// specified instruction 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(const MachineInstr *MI,
|
|
AliasAnalysis *AA = 0) const {
|
|
return MI->getOpcode() == TargetOpcode::IMPLICIT_DEF ||
|
|
(MI->getDesc().isRematerializable() &&
|
|
(isReallyTriviallyReMaterializable(MI, AA) ||
|
|
isReallyTriviallyReMaterializableGeneric(MI, AA)));
|
|
}
|
|
|
|
protected:
|
|
/// isReallyTriviallyReMaterializable - For instructions with opcodes for
|
|
/// which the M_REMATERIALIZABLE flag is set, this hook lets the target
|
|
/// specify whether the instruction is actually trivially rematerializable,
|
|
/// taking into consideration its operands. This predicate must 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(const MachineInstr *MI,
|
|
AliasAnalysis *AA) const {
|
|
return false;
|
|
}
|
|
|
|
private:
|
|
/// isReallyTriviallyReMaterializableGeneric - For instructions with opcodes
|
|
/// for which the M_REMATERIALIZABLE flag is set and the target hook
|
|
/// isReallyTriviallyReMaterializable returns false, this function does
|
|
/// target-independent tests to determine if the instruction is really
|
|
/// trivially rematerializable.
|
|
bool isReallyTriviallyReMaterializableGeneric(const MachineInstr *MI,
|
|
AliasAnalysis *AA) const;
|
|
|
|
public:
|
|
/// isMoveInstr - 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& SrcReg, unsigned& DstReg,
|
|
unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
|
|
return false;
|
|
}
|
|
|
|
/// isCoalescableExtInstr - Return true if the instruction is a "coalescable"
|
|
/// extension instruction. That is, it's like a copy where it's legal for the
|
|
/// source to overlap the destination. e.g. X86::MOVSX64rr32. If this returns
|
|
/// true, then it's expected the pre-extension value is available as a subreg
|
|
/// of the result register. This also returns the sub-register index in
|
|
/// SubIdx.
|
|
virtual bool isCoalescableExtInstr(const MachineInstr &MI,
|
|
unsigned &SrcReg, unsigned &DstReg,
|
|
unsigned &SubIdx) const {
|
|
return false;
|
|
}
|
|
|
|
/// isIdentityCopy - Return true if the instruction is a copy (or
|
|
/// extract_subreg, insert_subreg, subreg_to_reg) where the source and
|
|
/// destination registers are the same.
|
|
bool isIdentityCopy(const MachineInstr &MI) const {
|
|
unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
|
|
if (isMoveInstr(MI, SrcReg, DstReg, SrcSubIdx, DstSubIdx) &&
|
|
SrcReg == DstReg)
|
|
return true;
|
|
|
|
if (MI.getOpcode() == TargetOpcode::EXTRACT_SUBREG &&
|
|
MI.getOperand(0).getReg() == MI.getOperand(1).getReg())
|
|
return true;
|
|
|
|
if ((MI.getOpcode() == TargetOpcode::INSERT_SUBREG ||
|
|
MI.getOpcode() == TargetOpcode::SUBREG_TO_REG) &&
|
|
MI.getOperand(0).getReg() == MI.getOperand(2).getReg())
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/// isLoadFromStackSlot - 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.
|
|
virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
|
|
int &FrameIndex) const {
|
|
return 0;
|
|
}
|
|
|
|
/// isLoadFromStackSlotPostFE - Check for post-frame ptr elimination
|
|
/// stack locations as well. This uses a heuristic so it isn't
|
|
/// reliable for correctness.
|
|
virtual unsigned isLoadFromStackSlotPostFE(const MachineInstr *MI,
|
|
int &FrameIndex) const {
|
|
return 0;
|
|
}
|
|
|
|
/// hasLoadFromStackSlot - If the specified machine instruction has
|
|
/// a load from a stack slot, return true along with the FrameIndex
|
|
/// of the loaded stack slot and the machine mem operand containing
|
|
/// the reference. If not, return false. Unlike
|
|
/// isLoadFromStackSlot, this returns true for any instructions that
|
|
/// loads from the stack. This is just a hint, as some cases may be
|
|
/// missed.
|
|
virtual bool hasLoadFromStackSlot(const MachineInstr *MI,
|
|
const MachineMemOperand *&MMO,
|
|
int &FrameIndex) const {
|
|
return 0;
|
|
}
|
|
|
|
/// isStoreToStackSlot - 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.
|
|
virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
|
|
int &FrameIndex) const {
|
|
return 0;
|
|
}
|
|
|
|
/// isStoreToStackSlotPostFE - Check for post-frame ptr elimination
|
|
/// stack locations as well. This uses a heuristic so it isn't
|
|
/// reliable for correctness.
|
|
virtual unsigned isStoreToStackSlotPostFE(const MachineInstr *MI,
|
|
int &FrameIndex) const {
|
|
return 0;
|
|
}
|
|
|
|
/// hasStoreToStackSlot - If the specified machine instruction has a
|
|
/// store to a stack slot, return true along with the FrameIndex of
|
|
/// the loaded stack slot and the machine mem operand containing the
|
|
/// reference. If not, return false. Unlike isStoreToStackSlot,
|
|
/// this returns true for any instructions that stores to the
|
|
/// stack. This is just a hint, as some cases may be missed.
|
|
virtual bool hasStoreToStackSlot(const MachineInstr *MI,
|
|
const MachineMemOperand *&MMO,
|
|
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, unsigned SubIdx,
|
|
const MachineInstr *Orig,
|
|
const TargetRegisterInfo *TRI) const = 0;
|
|
|
|
/// duplicate - Create a duplicate of the Orig instruction in MF. This is like
|
|
/// MachineFunction::CloneMachineInstr(), but the target may update operands
|
|
/// that are required to be unique.
|
|
///
|
|
/// The instruction must be duplicable as indicated by isNotDuplicable().
|
|
virtual MachineInstr *duplicate(MachineInstr *Orig,
|
|
MachineFunction &MF) const = 0;
|
|
|
|
/// 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
|
|
/// three-address instructions on demand. This allows the X86 target (for
|
|
/// example) to convert ADD and SHL instructions into LEA instructions if they
|
|
/// would require register copies due to two-addressness.
|
|
///
|
|
/// This method returns a null pointer if the transformation cannot be
|
|
/// performed, otherwise it returns the last new instruction.
|
|
///
|
|
virtual MachineInstr *
|
|
convertToThreeAddress(MachineFunction::iterator &MFI,
|
|
MachineBasicBlock::iterator &MBBI, LiveVariables *LV) const {
|
|
return 0;
|
|
}
|
|
|
|
/// commuteInstruction - If a target has any instructions that are commutable,
|
|
/// but require converting to a different instruction or making non-trivial
|
|
/// changes to commute them, this method can overloaded to do this. The
|
|
/// default implementation of this method simply swaps the first two operands
|
|
/// of MI and returns it.
|
|
///
|
|
/// If a target wants to make more aggressive changes, they can construct and
|
|
/// return a new machine instruction. If an instruction cannot commute, it
|
|
/// can also return null.
|
|
///
|
|
/// If NewMI is true, then a new machine instruction must be created.
|
|
///
|
|
virtual MachineInstr *commuteInstruction(MachineInstr *MI,
|
|
bool NewMI = false) const = 0;
|
|
|
|
/// findCommutedOpIndices - If specified MI is commutable, return the two
|
|
/// operand indices that would swap value. Return true if the instruction
|
|
/// is not in a form which this routine understands.
|
|
virtual bool findCommutedOpIndices(MachineInstr *MI, unsigned &SrcOpIdx1,
|
|
unsigned &SrcOpIdx2) const = 0;
|
|
|
|
/// produceSameValue - Return true if two machine instructions would produce
|
|
/// identical values. By default, this is only true when the two instructions
|
|
/// are deemed identical except for defs.
|
|
virtual bool produceSameValue(const MachineInstr *MI0,
|
|
const MachineInstr *MI1) 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
|
|
/// 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).
|
|
///
|
|
virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
|
|
MachineBasicBlock *&FBB,
|
|
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
|
|
/// returns the number of instructions that were removed.
|
|
virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const {
|
|
assert(0 && "Target didn't implement TargetInstrInfo::RemoveBranch!");
|
|
return 0;
|
|
}
|
|
|
|
/// InsertBranch - 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.
|
|
virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
|
|
MachineBasicBlock *FBB,
|
|
const SmallVectorImpl<MachineOperand> &Cond) const {
|
|
assert(0 && "Target didn't implement TargetInstrInfo::InsertBranch!");
|
|
return 0;
|
|
}
|
|
|
|
/// 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,
|
|
DebugLoc DL) 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,
|
|
const TargetRegisterClass *RC,
|
|
const TargetRegisterInfo *TRI) const {
|
|
assert(0 && "Target didn't implement TargetInstrInfo::storeRegToStackSlot!");
|
|
}
|
|
|
|
/// 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,
|
|
const TargetRegisterClass *RC,
|
|
const TargetRegisterInfo *TRI) const {
|
|
assert(0 && "Target didn't implement TargetInstrInfo::loadRegFromStackSlot!");
|
|
}
|
|
|
|
/// 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;
|
|
}
|
|
|
|
/// emitFrameIndexDebugValue - Emit a target-dependent form of
|
|
/// DBG_VALUE encoding the address of a frame index. Addresses would
|
|
/// normally be lowered the same way as other addresses on the target,
|
|
/// e.g. in load instructions. For targets that do not support this
|
|
/// the debug info is simply lost.
|
|
/// If you add this for a target you should handle this DBG_VALUE in the
|
|
/// target-specific AsmPrinter code as well; you will probably get invalid
|
|
/// assembly output if you don't.
|
|
virtual MachineInstr *emitFrameIndexDebugValue(MachineFunction &MF,
|
|
int FrameIx,
|
|
uint64_t Offset,
|
|
const MDNode *MDPtr,
|
|
DebugLoc dl) const {
|
|
return 0;
|
|
}
|
|
|
|
/// 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.
|
|
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.
|
|
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;
|
|
}
|
|
|
|
/// 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(const MachineInstr *MI,
|
|
const 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. If LoadRegIndex is non-null, it is filled in with the operand
|
|
/// index of the operand which will hold the register holding the loaded
|
|
/// value.
|
|
virtual unsigned getOpcodeAfterMemoryUnfold(unsigned Opc,
|
|
bool UnfoldLoad, bool UnfoldStore,
|
|
unsigned *LoadRegIndex = 0) const {
|
|
return 0;
|
|
}
|
|
|
|
/// areLoadsFromSameBasePtr - This is used by the pre-regalloc scheduler
|
|
/// to determine if two loads are loading from the same base address. It
|
|
/// should only return true if the base pointers are the same and the
|
|
/// only differences between the two addresses are the offset. It also returns
|
|
/// the offsets by reference.
|
|
virtual bool areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2,
|
|
int64_t &Offset1, int64_t &Offset2) const {
|
|
return false;
|
|
}
|
|
|
|
/// shouldScheduleLoadsNear - This is a used by the pre-regalloc scheduler to
|
|
/// determine (in conjuction with areLoadsFromSameBasePtr) if two loads should
|
|
/// be scheduled togther. On some targets if two loads are loading from
|
|
/// addresses in the same cache line, it's better if they are scheduled
|
|
/// together. This function takes two integers that represent the load offsets
|
|
/// from the common base address. It returns true if it decides it's desirable
|
|
/// to schedule the two loads together. "NumLoads" is the number of loads that
|
|
/// have already been scheduled after Load1.
|
|
virtual bool shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2,
|
|
int64_t Offset1, int64_t Offset2,
|
|
unsigned NumLoads) 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(SmallVectorImpl<MachineOperand> &Cond) const {
|
|
return true;
|
|
}
|
|
|
|
/// insertNoop - Insert a noop into the instruction stream at the specified
|
|
/// point.
|
|
virtual void insertNoop(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI) const;
|
|
|
|
|
|
/// getNoopForMachoTarget - Return the noop instruction to use for a noop.
|
|
virtual void getNoopForMachoTarget(MCInst &NopInst) const {
|
|
// Default to just using 'nop' string.
|
|
}
|
|
|
|
|
|
/// isPredicated - Returns true if the instruction is already predicated.
|
|
///
|
|
virtual bool isPredicated(const MachineInstr *MI) const {
|
|
return false;
|
|
}
|
|
|
|
/// isUnpredicatedTerminator - Returns true if the instruction is a
|
|
/// terminator instruction that has not been predicated.
|
|
virtual bool isUnpredicatedTerminator(const MachineInstr *MI) const;
|
|
|
|
/// PredicateInstruction - Convert the instruction into a predicated
|
|
/// instruction. It returns true if the operation was successful.
|
|
virtual
|
|
bool PredicateInstruction(MachineInstr *MI,
|
|
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 SmallVectorImpl<MachineOperand> &Pred1,
|
|
const SmallVectorImpl<MachineOperand> &Pred2) const {
|
|
return false;
|
|
}
|
|
|
|
/// DefinesPredicate - 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.
|
|
virtual bool DefinesPredicate(MachineInstr *MI,
|
|
std::vector<MachineOperand> &Pred) const {
|
|
return false;
|
|
}
|
|
|
|
/// isPredicable - Return true if the specified instruction can be predicated.
|
|
/// By default, this returns true for every instruction with a
|
|
/// PredicateOperand.
|
|
virtual bool isPredicable(MachineInstr *MI) const {
|
|
return MI->getDesc().isPredicable();
|
|
}
|
|
|
|
/// 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;
|
|
|
|
/// Measure the specified inline asm to determine an approximation of its
|
|
/// length.
|
|
virtual unsigned getInlineAsmLength(const char *Str,
|
|
const MCAsmInfo &MAI) const;
|
|
};
|
|
|
|
/// 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 findCommutedOpIndices(MachineInstr *MI, unsigned &SrcOpIdx1,
|
|
unsigned &SrcOpIdx2) const;
|
|
virtual bool PredicateInstruction(MachineInstr *MI,
|
|
const SmallVectorImpl<MachineOperand> &Pred) const;
|
|
virtual void reMaterialize(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI,
|
|
unsigned DestReg, unsigned SubReg,
|
|
const MachineInstr *Orig,
|
|
const TargetRegisterInfo *TRI) const;
|
|
virtual MachineInstr *duplicate(MachineInstr *Orig,
|
|
MachineFunction &MF) const;
|
|
virtual bool produceSameValue(const MachineInstr *MI0,
|
|
const MachineInstr *MI1) const;
|
|
virtual unsigned GetFunctionSizeInBytes(const MachineFunction &MF) const;
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|