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115 lines
4.2 KiB
C++
115 lines
4.2 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 POWERPC32_INSTRUCTIONINFO_H
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#define POWERPC32_INSTRUCTIONINFO_H
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#include "PPC.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "PPCRegisterInfo.h"
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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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}
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class PPCInstrInfo : public TargetInstrInfo {
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PPCTargetMachine &TM;
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const PPCRegisterInfo RI;
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public:
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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 MRegisterInfo &getRegisterInfo() const { return RI; }
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/// getPointerRegClass - Return the register class to use to hold pointers.
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/// This is used for addressing modes.
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virtual const TargetRegisterClass *getPointerRegClass() const;
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// Return true if the instruction is a register to register move and
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// leave the source and dest operands in the passed parameters.
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//
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virtual bool isMoveInstr(const MachineInstr& MI,
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unsigned& sourceReg,
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unsigned& destReg) const;
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unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const;
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unsigned isStoreToStackSlot(MachineInstr *MI, 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) const;
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virtual void insertNoop(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const;
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static unsigned invertPPCBranchOpcode(unsigned Opcode) {
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switch (Opcode) {
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default: assert(0 && "Unknown PPC branch opcode!");
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case PPC::BEQ: return PPC::BNE;
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case PPC::BNE: return PPC::BEQ;
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case PPC::BLT: return PPC::BGE;
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case PPC::BGE: return PPC::BLT;
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case PPC::BGT: return PPC::BLE;
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case PPC::BLE: return PPC::BGT;
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case PPC::BNU: return PPC::BUN;
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case PPC::BUN: return PPC::BNU;
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}
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}
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};
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}
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#endif
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