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Summary: There is no change to the restrictions, just the result register is stored once in the encoding rather than twice. The rt field is zero in MIPS32r6/MIPS64r6. Depends on D4119 Reviewers: zoran.jovanovic, jkolek, vmedic Reviewed By: vmedic Differential Revision: http://reviews.llvm.org/D4120 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211019 91177308-0d34-0410-b5e6-96231b3b80d8
255 lines
8.0 KiB
C++
255 lines
8.0 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 "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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Mips1, Mips2, Mips32, Mips32r2, Mips32r6, Mips3, Mips4, Mips5, Mips64,
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Mips64r2, Mips64r6
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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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// IsNan2008 - IEEE 754-2008 NaN encoding.
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bool IsNaN2008bit;
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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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// CPU supports cnMIPS (Cavium Networks Octeon CPU).
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bool HasCnMips;
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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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// HasMips3_32 - The subset of MIPS-III instructions added to MIPS32
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bool HasMips3_32;
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// HasMips3_32r2 - The subset of MIPS-III instructions added to MIPS32r2
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bool HasMips3_32r2;
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// HasMips4_32 - Has the subset of MIPS-IV present in MIPS32
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bool HasMips4_32;
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// HasMips4_32r2 - Has the subset of MIPS-IV present in MIPS32r2
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bool HasMips4_32r2;
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// HasMips5_32r2 - Has the subset of MIPS-V present in MIPS32r2
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bool HasMips5_32r2;
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// InMips16 -- can process Mips16 instructions
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bool InMips16Mode;
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// Mips16 hard float
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bool InMips16HardFloat;
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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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// HasMSA -- supports MSA ASE.
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bool HasMSA;
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InstrItineraryData InstrItins;
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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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Triple TargetTriple;
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public:
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bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
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AntiDepBreakMode& Mode,
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RegClassVector& CriticalPathRCs) const override;
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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 hasMips2() const { return MipsArchVersion >= Mips2; }
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bool hasMips3() const { return MipsArchVersion >= Mips3; }
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bool hasMips4_32() const { return HasMips4_32; }
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bool hasMips4_32r2() const { return HasMips4_32r2; }
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bool hasMips32() const {
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return MipsArchVersion >= Mips32 && MipsArchVersion != Mips3 &&
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MipsArchVersion != Mips4 && MipsArchVersion != Mips5;
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}
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bool hasMips32r2() const {
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return MipsArchVersion == Mips32r2 || MipsArchVersion == Mips32r6 ||
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MipsArchVersion == Mips64r2 || MipsArchVersion == Mips64r6;
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}
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bool hasMips32r6() const {
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return MipsArchVersion == Mips32r6 || MipsArchVersion == Mips64r6;
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}
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bool hasMips64() const { return MipsArchVersion >= Mips64; }
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bool hasMips64r2() const {
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return MipsArchVersion == Mips64r2 || MipsArchVersion == Mips64r6;
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}
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bool hasMips64r6() const { return MipsArchVersion == Mips64r6; }
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bool hasCnMips() const { return HasCnMips; }
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bool isLittle() const { return IsLittle; }
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bool isFP64bit() const { return IsFP64bit; }
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bool isNaN2008() const { return IsNaN2008bit; }
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bool isNotFP64bit() 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() const {
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return InMips16Mode;
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}
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bool inMips16HardFloat() const {
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return inMips16Mode() && InMips16HardFloat;
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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 hasMSA() const { return HasMSA; }
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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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bool mipsSEUsesSoftFloat() const;
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bool enableLongBranchPass() const {
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return hasStandardEncoding() || allowMixed16_32();
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}
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/// Features related to the presence of specific instructions.
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bool hasExtractInsert() const { return !inMips16Mode() && hasMips32r2(); }
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const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
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bool allowMixed16_32() const { return inMips16ModeDefault() |
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AllowMixed16_32;}
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bool os16() const { return Os16;};
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bool isTargetNaCl() const { return TargetTriple.isOSNaCl(); }
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bool isNotTargetNaCl() const { return !TargetTriple.isOSNaCl(); }
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// for now constant islands are on for the whole compilation unit but we only
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// really use them if in addition we are in mips16 mode
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static bool useConstantIslands();
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unsigned stackAlignment() const { return hasMips64() ? 16 : 8; }
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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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/// Does the system support unaligned memory access.
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///
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/// MIPS32r6/MIPS64r6 require full unaligned access support but does not
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/// specify which component of the system provides it. Hardware, software, and
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/// hybrid implementations are all valid.
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bool systemSupportsUnalignedAccess() const { return hasMips32r6(); }
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};
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} // End llvm namespace
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#endif
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