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74adad6de8
Mips32 code as Mips16 unless it can't be compiled as Mips 16. For now this would happen as long as floating point instructions are not needed. Probably it would also make sense to compile as mips32 if atomic operations are needed too. There may be other cases too. A module pass prescans the IR and adds the mips16 or nomips16 attribute to functions depending on the functions needs. Mips 16 mode can result in a 40% code compression by utililizing 16 bit encoding of many instructions. The hope is for this to replace the traditional gcc way of dealing with Mips16 code using floating point which involves essentially using soft float but with a library implemented using mips32 floating point. This gcc method also requires creating stubs so that Mips32 code can interact with these Mips 16 functions that have floating point needs. My conjecture is that in reality this traditional gcc method would never win over this new method. I will be implementing the traditional gcc method also. Some of it is already done but I needed to do the stubs to finish the work and those required this mips16/32 mixed mode capability. I have more ideas for to make this new method much better and I think the old method will just live in llvm for anyone that needs the backward compatibility but I don't for what reason that would be needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179185 91177308-0d34-0410-b5e6-96231b3b80d8
209 lines
6.2 KiB
C++
209 lines
6.2 KiB
C++
//===-- MipsSubtarget.h - Define Subtarget for the Mips ---------*- 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 declares the Mips specific subclass of TargetSubtargetInfo.
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//
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//===----------------------------------------------------------------------===//
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#ifndef MIPSSUBTARGET_H
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#define MIPSSUBTARGET_H
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#include "MCTargetDesc/MipsReginfo.h"
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#include "llvm/MC/MCInstrItineraries.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#include <string>
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#define GET_SUBTARGETINFO_HEADER
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#include "MipsGenSubtargetInfo.inc"
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namespace llvm {
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class StringRef;
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class MipsTargetMachine;
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class MipsSubtarget : public MipsGenSubtargetInfo {
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virtual void anchor();
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public:
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// NOTE: O64 will not be supported.
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enum MipsABIEnum {
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UnknownABI, O32, N32, N64, EABI
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};
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protected:
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enum MipsArchEnum {
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Mips32, Mips32r2, Mips64, Mips64r2
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};
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// Mips architecture version
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MipsArchEnum MipsArchVersion;
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// Mips supported ABIs
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MipsABIEnum MipsABI;
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// IsLittle - The target is Little Endian
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bool IsLittle;
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// IsSingleFloat - The target only supports single precision float
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// point operations. This enable the target to use all 32 32-bit
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// floating point registers instead of only using even ones.
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bool IsSingleFloat;
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// IsFP64bit - The target processor has 64-bit floating point registers.
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bool IsFP64bit;
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// IsFP64bit - General-purpose registers are 64 bits wide
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bool IsGP64bit;
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// HasVFPU - Processor has a vector floating point unit.
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bool HasVFPU;
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// isLinux - Target system is Linux. Is false we consider ELFOS for now.
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bool IsLinux;
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// UseSmallSection - Small section is used.
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bool UseSmallSection;
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/// Features related to the presence of specific instructions.
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// HasSEInReg - SEB and SEH (signext in register) instructions.
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bool HasSEInReg;
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// HasCondMov - Conditional mov (MOVZ, MOVN) instructions.
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bool HasCondMov;
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// HasSwap - Byte and half swap instructions.
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bool HasSwap;
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// HasBitCount - Count leading '1' and '0' bits.
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bool HasBitCount;
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// HasFPIdx -- Floating point indexed load/store instructions.
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bool HasFPIdx;
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// InMips16 -- can process Mips16 instructions
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bool InMips16Mode;
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// PreviousInMips16 -- the function we just processed was in Mips 16 Mode
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bool PreviousInMips16Mode;
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// InMicroMips -- can process MicroMips instructions
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bool InMicroMipsMode;
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// HasDSP, HasDSPR2 -- supports DSP ASE.
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bool HasDSP, HasDSPR2;
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// Allow mixed Mips16 and Mips32 in one source file
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bool AllowMixed16_32;
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// Optimize for space by compiling all functions as Mips 16 unless
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// it needs floating point. Functions needing floating point are
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// compiled as Mips32
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bool Os16;
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InstrItineraryData InstrItins;
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// The instance to the register info section object
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MipsReginfo MRI;
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// Relocation Model
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Reloc::Model RM;
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// We can override the determination of whether we are in mips16 mode
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// as from the command line
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enum {NoOverride, Mips16Override, NoMips16Override} OverrideMode;
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MipsTargetMachine *TM;
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public:
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virtual bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
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AntiDepBreakMode& Mode,
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RegClassVector& CriticalPathRCs) const;
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/// Only O32 and EABI supported right now.
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bool isABI_EABI() const { return MipsABI == EABI; }
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bool isABI_N64() const { return MipsABI == N64; }
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bool isABI_N32() const { return MipsABI == N32; }
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bool isABI_O32() const { return MipsABI == O32; }
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unsigned getTargetABI() const { return MipsABI; }
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/// This constructor initializes the data members to match that
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/// of the specified triple.
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MipsSubtarget(const std::string &TT, const std::string &CPU,
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const std::string &FS, bool little, Reloc::Model RM,
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MipsTargetMachine *TM);
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/// ParseSubtargetFeatures - Parses features string setting specified
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/// subtarget options. Definition of function is auto generated by tblgen.
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void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
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bool hasMips32() const { return MipsArchVersion >= Mips32; }
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bool hasMips32r2() const { return MipsArchVersion == Mips32r2 ||
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MipsArchVersion == Mips64r2; }
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bool hasMips64() const { return MipsArchVersion >= Mips64; }
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bool hasMips64r2() const { return MipsArchVersion == Mips64r2; }
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bool isLittle() const { return IsLittle; }
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bool isFP64bit() const { return IsFP64bit; }
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bool isGP64bit() const { return IsGP64bit; }
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bool isGP32bit() const { return !IsGP64bit; }
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bool isSingleFloat() const { return IsSingleFloat; }
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bool isNotSingleFloat() const { return !IsSingleFloat; }
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bool hasVFPU() const { return HasVFPU; }
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bool inMips16Mode() const {
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switch (OverrideMode) {
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case NoOverride:
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return InMips16Mode;
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case Mips16Override:
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return true;
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case NoMips16Override:
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return false;
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}
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llvm_unreachable("Unexpected mode");
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}
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bool inMips16ModeDefault() {
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return InMips16Mode;
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}
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bool inMicroMipsMode() const { return InMicroMipsMode; }
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bool hasDSP() const { return HasDSP; }
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bool hasDSPR2() const { return HasDSPR2; }
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bool isLinux() const { return IsLinux; }
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bool useSmallSection() const { return UseSmallSection; }
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bool hasStandardEncoding() const { return !inMips16Mode(); }
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/// Features related to the presence of specific instructions.
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bool hasSEInReg() const { return HasSEInReg; }
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bool hasCondMov() const { return HasCondMov; }
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bool hasSwap() const { return HasSwap; }
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bool hasBitCount() const { return HasBitCount; }
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bool hasFPIdx() const { return HasFPIdx; }
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bool allowMixed16_32() const { return AllowMixed16_32;};
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bool os16() const { return Os16;};
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// Grab MipsRegInfo object
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const MipsReginfo &getMReginfo() const { return MRI; }
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// Grab relocation model
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Reloc::Model getRelocationModel() const {return RM;}
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/// \brief Reset the subtarget for the Mips target.
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void resetSubtarget(MachineFunction *MF);
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};
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} // End llvm namespace
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#endif
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