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506049f29f
- Eliminate TargetInstrInfo::isIdentical and replace it with produceSameValue. In the default case, produceSameValue just checks whether two machine instructions are identical (except for virtual register defs). But targets may override it to check for unusual cases (e.g. ARM pic loads from constant pools). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97628 91177308-0d34-0410-b5e6-96231b3b80d8
569 lines
26 KiB
C++
569 lines
26 KiB
C++
//===-- llvm/Target/TargetInstrInfo.h - Instruction Info --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file describes the target machine instruction set to the code generator.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETINSTRINFO_H
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#define LLVM_TARGET_TARGETINSTRINFO_H
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#include "llvm/Target/TargetInstrDesc.h"
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#include "llvm/CodeGen/MachineFunction.h"
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namespace llvm {
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class CalleeSavedInfo;
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class LiveVariables;
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class MCAsmInfo;
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class MachineMemOperand;
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class SDNode;
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class SelectionDAG;
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class TargetRegisterClass;
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class TargetRegisterInfo;
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template<class T> class SmallVectorImpl;
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//---------------------------------------------------------------------------
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///
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/// TargetInstrInfo - Interface to description of machine instruction set
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///
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class TargetInstrInfo {
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const TargetInstrDesc *Descriptors; // Raw array to allow static init'n
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unsigned NumOpcodes; // Number of entries in the desc array
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TargetInstrInfo(const TargetInstrInfo &); // DO NOT IMPLEMENT
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void operator=(const TargetInstrInfo &); // DO NOT IMPLEMENT
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public:
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TargetInstrInfo(const TargetInstrDesc *desc, unsigned NumOpcodes);
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virtual ~TargetInstrInfo();
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unsigned getNumOpcodes() const { return NumOpcodes; }
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/// get - Return the machine instruction descriptor that corresponds to the
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/// specified instruction opcode.
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///
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const TargetInstrDesc &get(unsigned Opcode) const {
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assert(Opcode < NumOpcodes && "Invalid opcode!");
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return Descriptors[Opcode];
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}
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/// isTriviallyReMaterializable - Return true if the instruction is trivially
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/// rematerializable, meaning it has no side effects and requires no operands
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/// that aren't always available.
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bool isTriviallyReMaterializable(const MachineInstr *MI,
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AliasAnalysis *AA = 0) const {
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return MI->getOpcode() == TargetOpcode::IMPLICIT_DEF ||
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(MI->getDesc().isRematerializable() &&
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(isReallyTriviallyReMaterializable(MI, AA) ||
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isReallyTriviallyReMaterializableGeneric(MI, AA)));
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}
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protected:
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/// isReallyTriviallyReMaterializable - For instructions with opcodes for
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/// which the M_REMATERIALIZABLE flag is set, this hook lets the target
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/// specify whether the instruction is actually trivially rematerializable,
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/// taking into consideration its operands. This predicate must return false
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/// if the instruction has any side effects other than producing a value, or
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/// if it requres any address registers that are not always available.
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virtual bool isReallyTriviallyReMaterializable(const MachineInstr *MI,
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AliasAnalysis *AA) const {
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return false;
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}
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private:
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/// isReallyTriviallyReMaterializableGeneric - For instructions with opcodes
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/// for which the M_REMATERIALIZABLE flag is set and the target hook
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/// isReallyTriviallyReMaterializable returns false, this function does
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/// target-independent tests to determine if the instruction is really
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/// trivially rematerializable.
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bool isReallyTriviallyReMaterializableGeneric(const MachineInstr *MI,
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AliasAnalysis *AA) const;
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public:
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/// isMoveInstr - Return true if the instruction is a register to register
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/// move and return the source and dest operands and their sub-register
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/// indices by reference.
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virtual bool isMoveInstr(const MachineInstr& MI,
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unsigned& SrcReg, unsigned& DstReg,
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unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
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return false;
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}
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/// isCoalescableExtInstr - Return true if the instruction is a "coalescable"
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/// extension instruction. That is, it's like a copy where it's legal for the
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/// source to overlap the destination. e.g. X86::MOVSX64rr32. If this returns
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/// true, then it's expected the pre-extension value is available as a subreg
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/// of the result register. This also returns the sub-register index in
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/// SubIdx.
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virtual bool isCoalescableExtInstr(const MachineInstr &MI,
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unsigned &SrcReg, unsigned &DstReg,
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unsigned &SubIdx) const {
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return false;
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}
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/// isIdentityCopy - Return true if the instruction is a copy (or
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/// extract_subreg, insert_subreg, subreg_to_reg) where the source and
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/// destination registers are the same.
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bool isIdentityCopy(const MachineInstr &MI) const {
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unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
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if (isMoveInstr(MI, SrcReg, DstReg, SrcSubIdx, DstSubIdx) &&
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SrcReg == DstReg)
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return true;
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if (MI.getOpcode() == TargetOpcode::EXTRACT_SUBREG &&
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MI.getOperand(0).getReg() == MI.getOperand(1).getReg())
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return true;
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if ((MI.getOpcode() == TargetOpcode::INSERT_SUBREG ||
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MI.getOpcode() == TargetOpcode::SUBREG_TO_REG) &&
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MI.getOperand(0).getReg() == MI.getOperand(2).getReg())
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return true;
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return false;
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}
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/// isLoadFromStackSlot - If the specified machine instruction is a direct
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/// load from a stack slot, return the virtual or physical register number of
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/// the destination along with the FrameIndex of the loaded stack slot. If
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/// not, return 0. This predicate must return 0 if the instruction has
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/// any side effects other than loading from the stack slot.
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virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
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int &FrameIndex) const {
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return 0;
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}
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/// isLoadFromStackSlotPostFE - Check for post-frame ptr elimination
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/// stack locations as well. This uses a heuristic so it isn't
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/// reliable for correctness.
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virtual unsigned isLoadFromStackSlotPostFE(const MachineInstr *MI,
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int &FrameIndex) const {
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return 0;
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}
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/// hasLoadFromStackSlot - If the specified machine instruction has
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/// a load from a stack slot, return true along with the FrameIndex
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/// of the loaded stack slot and the machine mem operand containing
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/// the reference. If not, return false. Unlike
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/// isLoadFromStackSlot, this returns true for any instructions that
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/// loads from the stack. This is just a hint, as some cases may be
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/// missed.
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virtual bool hasLoadFromStackSlot(const MachineInstr *MI,
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const MachineMemOperand *&MMO,
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int &FrameIndex) const {
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return 0;
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}
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/// isStoreToStackSlot - If the specified machine instruction is a direct
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/// store to a stack slot, return the virtual or physical register number of
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/// the source reg along with the FrameIndex of the loaded stack slot. If
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/// not, return 0. This predicate must return 0 if the instruction has
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/// any side effects other than storing to the stack slot.
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virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
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int &FrameIndex) const {
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return 0;
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}
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/// isStoreToStackSlotPostFE - Check for post-frame ptr elimination
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/// stack locations as well. This uses a heuristic so it isn't
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/// reliable for correctness.
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virtual unsigned isStoreToStackSlotPostFE(const MachineInstr *MI,
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int &FrameIndex) const {
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return 0;
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}
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/// hasStoreToStackSlot - If the specified machine instruction has a
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/// store to a stack slot, return true along with the FrameIndex of
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/// the loaded stack slot and the machine mem operand containing the
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/// reference. If not, return false. Unlike isStoreToStackSlot,
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/// this returns true for any instructions that loads from the
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/// stack. This is just a hint, as some cases may be missed.
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virtual bool hasStoreToStackSlot(const MachineInstr *MI,
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const MachineMemOperand *&MMO,
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int &FrameIndex) const {
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return 0;
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}
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/// reMaterialize - Re-issue the specified 'original' instruction at the
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/// specific location targeting a new destination register.
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virtual void reMaterialize(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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unsigned DestReg, unsigned SubIdx,
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const MachineInstr *Orig,
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const TargetRegisterInfo *TRI) const = 0;
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/// duplicate - Create a duplicate of the Orig instruction in MF. This is like
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/// MachineFunction::CloneMachineInstr(), but the target may update operands
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/// that are required to be unique.
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///
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/// The instruction must be duplicable as indicated by isNotDuplicable().
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virtual MachineInstr *duplicate(MachineInstr *Orig,
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MachineFunction &MF) const = 0;
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/// convertToThreeAddress - This method must be implemented by targets that
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/// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
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/// may be able to convert a two-address instruction into one or more true
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/// three-address instructions on demand. This allows the X86 target (for
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/// example) to convert ADD and SHL instructions into LEA instructions if they
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/// would require register copies due to two-addressness.
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///
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/// This method returns a null pointer if the transformation cannot be
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/// performed, otherwise it returns the last new instruction.
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///
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virtual MachineInstr *
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convertToThreeAddress(MachineFunction::iterator &MFI,
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MachineBasicBlock::iterator &MBBI, LiveVariables *LV) const {
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return 0;
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}
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/// commuteInstruction - If a target has any instructions that are commutable,
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/// but require converting to a different instruction or making non-trivial
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/// changes to commute them, this method can overloaded to do this. The
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/// default implementation of this method simply swaps the first two operands
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/// of MI and returns it.
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///
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/// If a target wants to make more aggressive changes, they can construct and
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/// return a new machine instruction. If an instruction cannot commute, it
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/// can also return null.
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///
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/// If NewMI is true, then a new machine instruction must be created.
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///
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virtual MachineInstr *commuteInstruction(MachineInstr *MI,
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bool NewMI = false) const = 0;
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/// findCommutedOpIndices - If specified MI is commutable, return the two
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/// operand indices that would swap value. Return true if the instruction
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/// is not in a form which this routine understands.
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virtual bool findCommutedOpIndices(MachineInstr *MI, unsigned &SrcOpIdx1,
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unsigned &SrcOpIdx2) const = 0;
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/// produceSameValue - Return true if two machine instructions would produce
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/// identical values. By default, this is only true when the two instructions
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/// are deemed identical except for defs.
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virtual bool produceSameValue(const MachineInstr *MI0,
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const MachineInstr *MI1) const = 0;
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/// AnalyzeBranch - Analyze the branching code at the end of MBB, returning
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/// true if it cannot be understood (e.g. it's a switch dispatch or isn't
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/// implemented for a target). Upon success, this returns false and returns
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/// with the following information in various cases:
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///
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/// 1. If this block ends with no branches (it just falls through to its succ)
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/// just return false, leaving TBB/FBB null.
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/// 2. If this block ends with only an unconditional branch, it sets TBB to be
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/// the destination block.
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/// 3. If this block ends with a conditional branch and it falls through to a
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/// successor block, it sets TBB to be the branch destination block and a
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/// list of operands that evaluate the condition. These operands can be
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/// passed to other TargetInstrInfo methods to create new branches.
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/// 4. If this block ends with a conditional branch followed by an
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/// unconditional branch, it returns the 'true' destination in TBB, the
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/// 'false' destination in FBB, and a list of operands that evaluate the
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/// condition. These operands can be passed to other TargetInstrInfo
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/// methods to create new branches.
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///
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/// Note that RemoveBranch and InsertBranch must be implemented to support
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/// cases where this method returns success.
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///
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/// If AllowModify is true, then this routine is allowed to modify the basic
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/// block (e.g. delete instructions after the unconditional branch).
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///
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virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
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MachineBasicBlock *&FBB,
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SmallVectorImpl<MachineOperand> &Cond,
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bool AllowModify = false) const {
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return true;
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}
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/// RemoveBranch - Remove the branching code at the end of the specific MBB.
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/// This is only invoked in cases where AnalyzeBranch returns success. It
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/// returns the number of instructions that were removed.
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virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const {
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assert(0 && "Target didn't implement TargetInstrInfo::RemoveBranch!");
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return 0;
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}
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/// InsertBranch - Insert branch code into the end of the specified
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/// MachineBasicBlock. The operands to this method are the same as those
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/// returned by AnalyzeBranch. This is only invoked in cases where
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/// AnalyzeBranch returns success. It returns the number of instructions
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/// inserted.
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///
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/// It is also invoked by tail merging to add unconditional branches in
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/// cases where AnalyzeBranch doesn't apply because there was no original
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/// branch to analyze. At least this much must be implemented, else tail
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/// merging needs to be disabled.
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virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
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MachineBasicBlock *FBB,
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const SmallVectorImpl<MachineOperand> &Cond) const {
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assert(0 && "Target didn't implement TargetInstrInfo::InsertBranch!");
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return 0;
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}
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/// copyRegToReg - Emit instructions to copy between a pair of registers. It
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/// returns false if the target does not how to copy between the specified
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/// registers.
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virtual bool copyRegToReg(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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unsigned DestReg, unsigned SrcReg,
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const TargetRegisterClass *DestRC,
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const TargetRegisterClass *SrcRC) const {
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assert(0 && "Target didn't implement TargetInstrInfo::copyRegToReg!");
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return false;
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}
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/// storeRegToStackSlot - Store the specified register of the given register
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/// class to the specified stack frame index. The store instruction is to be
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/// added to the given machine basic block before the specified machine
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/// instruction. If isKill is true, the register operand is the last use and
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/// must be marked kill.
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virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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unsigned SrcReg, bool isKill, int FrameIndex,
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const TargetRegisterClass *RC) const {
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assert(0 && "Target didn't implement TargetInstrInfo::storeRegToStackSlot!");
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}
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/// loadRegFromStackSlot - Load the specified register of the given register
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/// class from the specified stack frame index. The load instruction is to be
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/// added to the given machine basic block before the specified machine
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/// instruction.
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virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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unsigned DestReg, int FrameIndex,
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const TargetRegisterClass *RC) const {
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assert(0 && "Target didn't implement TargetInstrInfo::loadRegFromStackSlot!");
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}
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/// spillCalleeSavedRegisters - Issues instruction(s) to spill all callee
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/// saved registers and returns true if it isn't possible / profitable to do
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/// so by issuing a series of store instructions via
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/// storeRegToStackSlot(). Returns false otherwise.
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virtual bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI) const {
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return false;
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}
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/// restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee
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/// saved registers and returns true if it isn't possible / profitable to do
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/// so by issuing a series of load instructions via loadRegToStackSlot().
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/// Returns false otherwise.
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virtual bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI) const {
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return false;
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}
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/// foldMemoryOperand - Attempt to fold a load or store of the specified stack
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/// slot into the specified machine instruction for the specified operand(s).
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/// If this is possible, a new instruction is returned with the specified
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/// operand folded, otherwise NULL is returned. The client is responsible for
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/// removing the old instruction and adding the new one in the instruction
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/// stream.
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MachineInstr* foldMemoryOperand(MachineFunction &MF,
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MachineInstr* MI,
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const SmallVectorImpl<unsigned> &Ops,
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int FrameIndex) const;
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/// foldMemoryOperand - Same as the previous version except it allows folding
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/// of any load and store from / to any address, not just from a specific
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/// stack slot.
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MachineInstr* foldMemoryOperand(MachineFunction &MF,
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MachineInstr* MI,
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const SmallVectorImpl<unsigned> &Ops,
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MachineInstr* LoadMI) const;
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protected:
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/// foldMemoryOperandImpl - Target-dependent implementation for
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/// foldMemoryOperand. Target-independent code in foldMemoryOperand will
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/// take care of adding a MachineMemOperand to the newly created instruction.
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virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
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MachineInstr* MI,
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const SmallVectorImpl<unsigned> &Ops,
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int FrameIndex) const {
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return 0;
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}
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/// foldMemoryOperandImpl - Target-dependent implementation for
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/// foldMemoryOperand. Target-independent code in foldMemoryOperand will
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/// take care of adding a MachineMemOperand to the newly created instruction.
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virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
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MachineInstr* MI,
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const SmallVectorImpl<unsigned> &Ops,
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MachineInstr* LoadMI) const {
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return 0;
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}
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public:
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/// canFoldMemoryOperand - Returns true for the specified load / store if
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/// folding is possible.
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virtual
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bool canFoldMemoryOperand(const MachineInstr *MI,
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const SmallVectorImpl<unsigned> &Ops) const {
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return false;
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}
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/// unfoldMemoryOperand - Separate a single instruction which folded a load or
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/// a store or a load and a store into two or more instruction. If this is
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/// possible, returns true as well as the new instructions by reference.
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virtual bool unfoldMemoryOperand(MachineFunction &MF, MachineInstr *MI,
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unsigned Reg, bool UnfoldLoad, bool UnfoldStore,
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SmallVectorImpl<MachineInstr*> &NewMIs) const{
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return false;
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}
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virtual bool unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
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SmallVectorImpl<SDNode*> &NewNodes) const {
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return false;
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}
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/// getOpcodeAfterMemoryUnfold - Returns the opcode of the would be new
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/// instruction after load / store are unfolded from an instruction of the
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/// specified opcode. It returns zero if the specified unfolding is not
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/// possible. If LoadRegIndex is non-null, it is filled in with the operand
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/// index of the operand which will hold the register holding the loaded
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/// value.
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virtual unsigned getOpcodeAfterMemoryUnfold(unsigned Opc,
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bool UnfoldLoad, bool UnfoldStore,
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unsigned *LoadRegIndex = 0) const {
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return 0;
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}
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/// areLoadsFromSameBasePtr - This is used by the pre-regalloc scheduler
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/// to determine if two loads are loading from the same base address. It
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/// should only return true if the base pointers are the same and the
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/// only differences between the two addresses are the offset. It also returns
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/// the offsets by reference.
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virtual bool areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2,
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int64_t &Offset1, int64_t &Offset2) const {
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return false;
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}
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/// shouldScheduleLoadsNear - This is a used by the pre-regalloc scheduler to
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/// determine (in conjuction with areLoadsFromSameBasePtr) if two loads should
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/// be scheduled togther. On some targets if two loads are loading from
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/// addresses in the same cache line, it's better if they are scheduled
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/// together. This function takes two integers that represent the load offsets
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/// from the common base address. It returns true if it decides it's desirable
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/// to schedule the two loads together. "NumLoads" is the number of loads that
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/// have already been scheduled after Load1.
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virtual bool shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2,
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int64_t Offset1, int64_t Offset2,
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unsigned NumLoads) const {
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return false;
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}
|
|
|
|
/// 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;
|
|
|
|
/// 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
|