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Many PPC instructions have a so-called 'record form' which stores to a specific condition register the result of comparing the result of the instruction with zero (always as a signed comparison). For integer operations on PPC64, this is always a 64-bit comparison. This implementation is derived from the implementation in the ARM backend; there are some differences because PPC condition registers are allocatable virtual registers (although the record forms always use a specific one), and we look for a matching subtraction instruction after the compare (but before the first use) in addition to before it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179802 91177308-0d34-0410-b5e6-96231b3b80d8
229 lines
9.5 KiB
C++
229 lines
9.5 KiB
C++
//===-- PPCInstrInfo.h - PowerPC 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 PowerPC implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef POWERPC_INSTRUCTIONINFO_H
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#define POWERPC_INSTRUCTIONINFO_H
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#include "PPC.h"
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#include "PPCRegisterInfo.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#define GET_INSTRINFO_HEADER
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#include "PPCGenInstrInfo.inc"
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namespace llvm {
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/// PPCII - This namespace holds all of the PowerPC target-specific
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/// per-instruction flags. These must match the corresponding definitions in
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/// PPC.td and PPCInstrFormats.td.
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namespace PPCII {
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enum {
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// PPC970 Instruction Flags. These flags describe the characteristics of the
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// PowerPC 970 (aka G5) dispatch groups and how they are formed out of
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// raw machine instructions.
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/// PPC970_First - This instruction starts a new dispatch group, so it will
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/// always be the first one in the group.
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PPC970_First = 0x1,
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/// PPC970_Single - This instruction starts a new dispatch group and
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/// terminates it, so it will be the sole instruction in the group.
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PPC970_Single = 0x2,
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/// PPC970_Cracked - This instruction is cracked into two pieces, requiring
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/// two dispatch pipes to be available to issue.
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PPC970_Cracked = 0x4,
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/// PPC970_Mask/Shift - This is a bitmask that selects the pipeline type that
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/// an instruction is issued to.
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PPC970_Shift = 3,
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PPC970_Mask = 0x07 << PPC970_Shift
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};
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enum PPC970_Unit {
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/// These are the various PPC970 execution unit pipelines. Each instruction
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/// is one of these.
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PPC970_Pseudo = 0 << PPC970_Shift, // Pseudo instruction
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PPC970_FXU = 1 << PPC970_Shift, // Fixed Point (aka Integer/ALU) Unit
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PPC970_LSU = 2 << PPC970_Shift, // Load Store Unit
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PPC970_FPU = 3 << PPC970_Shift, // Floating Point Unit
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PPC970_CRU = 4 << PPC970_Shift, // Control Register Unit
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PPC970_VALU = 5 << PPC970_Shift, // Vector ALU
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PPC970_VPERM = 6 << PPC970_Shift, // Vector Permute Unit
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PPC970_BRU = 7 << PPC970_Shift // Branch Unit
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};
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} // end namespace PPCII
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class PPCInstrInfo : public PPCGenInstrInfo {
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PPCTargetMachine &TM;
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const PPCRegisterInfo RI;
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bool StoreRegToStackSlot(MachineFunction &MF,
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unsigned SrcReg, bool isKill, int FrameIdx,
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const TargetRegisterClass *RC,
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SmallVectorImpl<MachineInstr*> &NewMIs,
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bool &NonRI, bool &SpillsVRS) const;
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bool LoadRegFromStackSlot(MachineFunction &MF, DebugLoc DL,
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unsigned DestReg, int FrameIdx,
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const TargetRegisterClass *RC,
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SmallVectorImpl<MachineInstr*> &NewMIs,
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bool &NonRI, bool &SpillsVRS) const;
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public:
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explicit PPCInstrInfo(PPCTargetMachine &TM);
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/// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As
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/// such, whenever a client has an instance of instruction info, it should
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/// always be able to get register info as well (through this method).
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///
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virtual const PPCRegisterInfo &getRegisterInfo() const { return RI; }
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ScheduleHazardRecognizer *
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CreateTargetHazardRecognizer(const TargetMachine *TM,
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const ScheduleDAG *DAG) const;
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ScheduleHazardRecognizer *
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CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II,
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const ScheduleDAG *DAG) const;
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bool isCoalescableExtInstr(const MachineInstr &MI,
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unsigned &SrcReg, unsigned &DstReg,
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unsigned &SubIdx) const;
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unsigned isLoadFromStackSlot(const MachineInstr *MI,
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int &FrameIndex) const;
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unsigned isStoreToStackSlot(const MachineInstr *MI,
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int &FrameIndex) const;
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// commuteInstruction - We can commute rlwimi instructions, but only if the
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// rotate amt is zero. We also have to munge the immediates a bit.
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virtual MachineInstr *commuteInstruction(MachineInstr *MI, bool NewMI) const;
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virtual void insertNoop(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const;
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// Branch analysis.
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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) const;
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virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
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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;
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// Select analysis.
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virtual bool canInsertSelect(const MachineBasicBlock&,
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const SmallVectorImpl<MachineOperand> &Cond,
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unsigned, unsigned, int&, int&, int&) const;
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virtual void insertSelect(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI, DebugLoc DL,
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unsigned DstReg,
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const SmallVectorImpl<MachineOperand> &Cond,
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unsigned TrueReg, unsigned FalseReg) const;
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virtual void copyPhysReg(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I, DebugLoc DL,
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unsigned DestReg, unsigned SrcReg,
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bool KillSrc) const;
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virtual void 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;
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virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned DestReg, int FrameIndex,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const;
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virtual MachineInstr *emitFrameIndexDebugValue(MachineFunction &MF,
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int FrameIx,
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uint64_t Offset,
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const MDNode *MDPtr,
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DebugLoc DL) const;
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virtual
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bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
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virtual bool FoldImmediate(MachineInstr *UseMI, MachineInstr *DefMI,
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unsigned Reg, MachineRegisterInfo *MRI) const;
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// If conversion by predication (only supported by some branch instructions).
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// All of the profitability checks always return true; it is always
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// profitable to use the predicated branches.
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virtual bool isProfitableToIfCvt(MachineBasicBlock &MBB,
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unsigned NumCycles, unsigned ExtraPredCycles,
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const BranchProbability &Probability) const {
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return true;
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}
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virtual bool isProfitableToIfCvt(MachineBasicBlock &TMBB,
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unsigned NumT, unsigned ExtraT,
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MachineBasicBlock &FMBB,
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unsigned NumF, unsigned ExtraF,
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const BranchProbability &Probability) const;
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virtual bool isProfitableToDupForIfCvt(MachineBasicBlock &MBB,
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unsigned NumCycles,
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const BranchProbability
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&Probability) const {
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return true;
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}
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virtual bool isProfitableToUnpredicate(MachineBasicBlock &TMBB,
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MachineBasicBlock &FMBB) const {
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return false;
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}
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// Predication support.
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bool isPredicated(const MachineInstr *MI) const;
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virtual bool isUnpredicatedTerminator(const MachineInstr *MI) const;
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virtual
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bool PredicateInstruction(MachineInstr *MI,
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const SmallVectorImpl<MachineOperand> &Pred) const;
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virtual
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bool SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
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const SmallVectorImpl<MachineOperand> &Pred2) const;
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virtual bool DefinesPredicate(MachineInstr *MI,
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std::vector<MachineOperand> &Pred) const;
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virtual bool isPredicable(MachineInstr *MI) const;
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// Comparison optimization.
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virtual bool analyzeCompare(const MachineInstr *MI,
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unsigned &SrcReg, unsigned &SrcReg2,
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int &Mask, int &Value) const;
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virtual bool optimizeCompareInstr(MachineInstr *CmpInstr,
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unsigned SrcReg, unsigned SrcReg2,
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int Mask, int Value,
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const MachineRegisterInfo *MRI) const;
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/// GetInstSize - Return the number of bytes of code the specified
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/// instruction may be. This returns the maximum number of bytes.
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///
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virtual unsigned GetInstSizeInBytes(const MachineInstr *MI) const;
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};
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}
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#endif
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