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For now this is restricted to fixed-length comparisons with a length in the range [1, 256], as for memcpy() and MVC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188163 91177308-0d34-0410-b5e6-96231b3b80d8
238 lines
9.6 KiB
C++
238 lines
9.6 KiB
C++
//===-- SystemZInstrInfo.h - SystemZ instruction information ----*- 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 contains the SystemZ implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_SYSTEMZINSTRINFO_H
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#define LLVM_TARGET_SYSTEMZINSTRINFO_H
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#include "SystemZ.h"
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#include "SystemZRegisterInfo.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#define GET_INSTRINFO_HEADER
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#include "SystemZGenInstrInfo.inc"
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namespace llvm {
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class SystemZTargetMachine;
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namespace SystemZII {
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enum {
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// See comments in SystemZInstrFormats.td.
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SimpleBDXLoad = (1 << 0),
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SimpleBDXStore = (1 << 1),
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Has20BitOffset = (1 << 2),
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HasIndex = (1 << 3),
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Is128Bit = (1 << 4),
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AccessSizeMask = (31 << 5),
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AccessSizeShift = 5,
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CCValuesMask = (15 << 10),
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CCValuesShift = 10,
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CompareZeroCCMaskMask = (15 << 14),
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CompareZeroCCMaskShift = 14,
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CCMaskFirst = (1 << 18),
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CCMaskLast = (1 << 19),
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IsLogical = (1 << 20)
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};
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static inline unsigned getAccessSize(unsigned int Flags) {
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return (Flags & AccessSizeMask) >> AccessSizeShift;
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}
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static inline unsigned getCCValues(unsigned int Flags) {
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return (Flags & CCValuesMask) >> CCValuesShift;
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}
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static inline unsigned getCompareZeroCCMask(unsigned int Flags) {
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return (Flags & CompareZeroCCMaskMask) >> CompareZeroCCMaskShift;
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}
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// SystemZ MachineOperand target flags.
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enum {
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// Masks out the bits for the access model.
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MO_SYMBOL_MODIFIER = (1 << 0),
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// @GOT (aka @GOTENT)
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MO_GOT = (1 << 0)
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};
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// Classifies a branch.
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enum BranchType {
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// An instruction that branches on the current value of CC.
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BranchNormal,
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// An instruction that peforms a 32-bit signed comparison and branches
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// on the result.
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BranchC,
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// An instruction that peforms a 64-bit signed comparison and branches
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// on the result.
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BranchCG,
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// An instruction that decrements a 32-bit register and branches if
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// the result is nonzero.
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BranchCT,
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// An instruction that decrements a 64-bit register and branches if
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// the result is nonzero.
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BranchCTG
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};
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// Information about a branch instruction.
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struct Branch {
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// The type of the branch.
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BranchType Type;
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// CCMASK_<N> is set if CC might be equal to N.
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unsigned CCValid;
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// CCMASK_<N> is set if the branch should be taken when CC == N.
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unsigned CCMask;
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// The target of the branch.
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const MachineOperand *Target;
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Branch(BranchType type, unsigned ccValid, unsigned ccMask,
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const MachineOperand *target)
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: Type(type), CCValid(ccValid), CCMask(ccMask), Target(target) {}
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};
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}
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class SystemZInstrInfo : public SystemZGenInstrInfo {
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const SystemZRegisterInfo RI;
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SystemZTargetMachine &TM;
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void splitMove(MachineBasicBlock::iterator MI, unsigned NewOpcode) const;
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void splitAdjDynAlloc(MachineBasicBlock::iterator MI) const;
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public:
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explicit SystemZInstrInfo(SystemZTargetMachine &TM);
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// Override TargetInstrInfo.
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virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
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int &FrameIndex) const LLVM_OVERRIDE;
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virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
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int &FrameIndex) const LLVM_OVERRIDE;
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virtual bool isStackSlotCopy(const MachineInstr *MI, int &DestFrameIndex,
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int &SrcFrameIndex) const LLVM_OVERRIDE;
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virtual bool AnalyzeBranch(MachineBasicBlock &MBB,
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MachineBasicBlock *&TBB,
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MachineBasicBlock *&FBB,
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SmallVectorImpl<MachineOperand> &Cond,
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bool AllowModify) const LLVM_OVERRIDE;
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virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const LLVM_OVERRIDE;
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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,
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DebugLoc DL) const LLVM_OVERRIDE;
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bool analyzeCompare(const MachineInstr *MI, unsigned &SrcReg,
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unsigned &SrcReg2, int &Mask, int &Value) const
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LLVM_OVERRIDE;
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bool optimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg,
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unsigned SrcReg2, int Mask, int Value,
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const MachineRegisterInfo *MRI) const LLVM_OVERRIDE;
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virtual bool isPredicable(MachineInstr *MI) const LLVM_OVERRIDE;
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virtual bool isProfitableToIfCvt(MachineBasicBlock &MBB, unsigned NumCycles,
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unsigned ExtraPredCycles,
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const BranchProbability &Probability) const
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LLVM_OVERRIDE;
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virtual bool isProfitableToIfCvt(MachineBasicBlock &TMBB,
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unsigned NumCyclesT,
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unsigned ExtraPredCyclesT,
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MachineBasicBlock &FMBB,
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unsigned NumCyclesF,
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unsigned ExtraPredCyclesF,
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const BranchProbability &Probability) const
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LLVM_OVERRIDE;
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virtual bool
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PredicateInstruction(MachineInstr *MI,
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const SmallVectorImpl<MachineOperand> &Pred) const
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LLVM_OVERRIDE;
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virtual void copyPhysReg(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI, DebugLoc DL,
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unsigned DestReg, unsigned SrcReg,
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bool KillSrc) const LLVM_OVERRIDE;
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virtual void
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storeRegToStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned SrcReg, bool isKill, int FrameIndex,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const LLVM_OVERRIDE;
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virtual void
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loadRegFromStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned DestReg, int FrameIdx,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const LLVM_OVERRIDE;
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virtual MachineInstr *
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convertToThreeAddress(MachineFunction::iterator &MFI,
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MachineBasicBlock::iterator &MBBI,
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LiveVariables *LV) const;
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virtual MachineInstr *
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foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
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const SmallVectorImpl<unsigned> &Ops,
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int FrameIndex) const;
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virtual MachineInstr *
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foldMemoryOperandImpl(MachineFunction &MF, MachineInstr* MI,
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const SmallVectorImpl<unsigned> &Ops,
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MachineInstr* LoadMI) const;
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virtual bool
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expandPostRAPseudo(MachineBasicBlock::iterator MBBI) const LLVM_OVERRIDE;
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virtual bool
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ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const
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LLVM_OVERRIDE;
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// Return the SystemZRegisterInfo, which this class owns.
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const SystemZRegisterInfo &getRegisterInfo() const { return RI; }
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// Return the size in bytes of MI.
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uint64_t getInstSizeInBytes(const MachineInstr *MI) const;
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// Return true if MI is a conditional or unconditional branch.
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// When returning true, set Cond to the mask of condition-code
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// values on which the instruction will branch, and set Target
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// to the operand that contains the branch target. This target
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// can be a register or a basic block.
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SystemZII::Branch getBranchInfo(const MachineInstr *MI) const;
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// Get the load and store opcodes for a given register class.
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void getLoadStoreOpcodes(const TargetRegisterClass *RC,
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unsigned &LoadOpcode, unsigned &StoreOpcode) const;
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// Opcode is the opcode of an instruction that has an address operand,
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// and the caller wants to perform that instruction's operation on an
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// address that has displacement Offset. Return the opcode of a suitable
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// instruction (which might be Opcode itself) or 0 if no such instruction
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// exists.
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unsigned getOpcodeForOffset(unsigned Opcode, int64_t Offset) const;
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// If Opcode is a load instruction that has a LOAD AND TEST form,
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// return the opcode for the testing form, otherwise return 0.
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unsigned getLoadAndTest(unsigned Opcode) const;
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// Return true if ROTATE AND ... SELECTED BITS can be used to select bits
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// Mask of the R2 operand, given that only the low BitSize bits of Mask are
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// significant. Set Start and End to the I3 and I4 operands if so.
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bool isRxSBGMask(uint64_t Mask, unsigned BitSize,
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unsigned &Start, unsigned &End) const;
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// If Opcode is a COMPARE opcode for which an associated COMPARE AND
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// BRANCH exists, return the opcode for the latter, otherwise return 0.
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// MI, if nonnull, is the compare instruction.
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unsigned getCompareAndBranch(unsigned Opcode,
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const MachineInstr *MI = 0) const;
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// Emit code before MBBI in MI to move immediate value Value into
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// physical register Reg.
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void loadImmediate(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned Reg, uint64_t Value) const;
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};
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} // end namespace llvm
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#endif
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