| //=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- C++ -*--====// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file declares the ARM specific subclass of TargetSubtarget. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef ARMSUBTARGET_H |
| #define ARMSUBTARGET_H |
| |
| #include "llvm/Target/TargetInstrItineraries.h" |
| #include "llvm/Target/TargetMachine.h" |
| #include "llvm/Target/TargetSubtarget.h" |
| #include "llvm/ADT/Triple.h" |
| #include <string> |
| |
| namespace llvm { |
| class GlobalValue; |
| |
| class ARMSubtarget : public TargetSubtarget { |
| protected: |
| enum ARMArchEnum { |
| V4, V4T, V5T, V5TE, V6, V6M, V6T2, V7A, V7M |
| }; |
| |
| enum ARMProcFamilyEnum { |
| Others, CortexA8, CortexA9 |
| }; |
| |
| enum ARMFPEnum { |
| None, VFPv2, VFPv3, NEON |
| }; |
| |
| enum ThumbTypeEnum { |
| Thumb1, |
| Thumb2 |
| }; |
| |
| /// ARMArchVersion - ARM architecture version: V4, V4T (base), V5T, V5TE, |
| /// V6, V6T2, V7A, V7M. |
| ARMArchEnum ARMArchVersion; |
| |
| /// ARMProcFamily - ARM processor family: Cortex-A8, Cortex-A9, and others. |
| ARMProcFamilyEnum ARMProcFamily; |
| |
| /// ARMFPUType - Floating Point Unit type. |
| ARMFPEnum ARMFPUType; |
| |
| /// UseNEONForSinglePrecisionFP - if the NEONFP attribute has been |
| /// specified. Use the method useNEONForSinglePrecisionFP() to |
| /// determine if NEON should actually be used. |
| bool UseNEONForSinglePrecisionFP; |
| |
| /// SlowFPVMLx - If the VFP2 / NEON instructions are available, indicates |
| /// whether the FP VML[AS] instructions are slow (if so, don't use them). |
| bool SlowFPVMLx; |
| |
| /// SlowFPBrcc - True if floating point compare + branch is slow. |
| bool SlowFPBrcc; |
| |
| /// IsThumb - True if we are in thumb mode, false if in ARM mode. |
| bool IsThumb; |
| |
| /// ThumbMode - Indicates supported Thumb version. |
| ThumbTypeEnum ThumbMode; |
| |
| /// NoARM - True if subtarget does not support ARM mode execution. |
| bool NoARM; |
| |
| /// PostRAScheduler - True if using post-register-allocation scheduler. |
| bool PostRAScheduler; |
| |
| /// IsR9Reserved - True if R9 is a not available as general purpose register. |
| bool IsR9Reserved; |
| |
| /// UseMovt - True if MOVT / MOVW pairs are used for materialization of 32-bit |
| /// imms (including global addresses). |
| bool UseMovt; |
| |
| /// HasFP16 - True if subtarget supports half-precision FP (We support VFP+HF |
| /// only so far) |
| bool HasFP16; |
| |
| /// HasD16 - True if subtarget is limited to 16 double precision |
| /// FP registers for VFPv3. |
| bool HasD16; |
| |
| /// HasHardwareDivide - True if subtarget supports [su]div |
| bool HasHardwareDivide; |
| |
| /// HasT2ExtractPack - True if subtarget supports thumb2 extract/pack |
| /// instructions. |
| bool HasT2ExtractPack; |
| |
| /// HasDataBarrier - True if the subtarget supports DMB / DSB data barrier |
| /// instructions. |
| bool HasDataBarrier; |
| |
| /// Pref32BitThumb - If true, codegen would prefer 32-bit Thumb instructions |
| /// over 16-bit ones. |
| bool Pref32BitThumb; |
| |
| /// HasMPExtension - True if the subtarget supports Multiprocessing |
| /// extension (ARMv7 only). |
| bool HasMPExtension; |
| |
| /// FPOnlySP - If true, the floating point unit only supports single |
| /// precision. |
| bool FPOnlySP; |
| |
| /// AllowsUnalignedMem - If true, the subtarget allows unaligned memory |
| /// accesses for some types. For details, see |
| /// ARMTargetLowering::allowsUnalignedMemoryAccesses(). |
| bool AllowsUnalignedMem; |
| |
| /// stackAlignment - The minimum alignment known to hold of the stack frame on |
| /// entry to the function and which must be maintained by every function. |
| unsigned stackAlignment; |
| |
| /// CPUString - String name of used CPU. |
| std::string CPUString; |
| |
| /// TargetTriple - What processor and OS we're targeting. |
| Triple TargetTriple; |
| |
| /// Selected instruction itineraries (one entry per itinerary class.) |
| InstrItineraryData InstrItins; |
| |
| public: |
| enum { |
| isELF, isDarwin |
| } TargetType; |
| |
| enum { |
| ARM_ABI_APCS, |
| ARM_ABI_AAPCS // ARM EABI |
| } TargetABI; |
| |
| /// This constructor initializes the data members to match that |
| /// of the specified triple. |
| /// |
| ARMSubtarget(const std::string &TT, const std::string &FS, bool isThumb); |
| |
| /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size |
| /// that still makes it profitable to inline the call. |
| unsigned getMaxInlineSizeThreshold() const { |
| // FIXME: For now, we don't lower memcpy's to loads / stores for Thumb1. |
| // Change this once Thumb1 ldmia / stmia support is added. |
| return isThumb1Only() ? 0 : 64; |
| } |
| /// ParseSubtargetFeatures - Parses features string setting specified |
| /// subtarget options. Definition of function is auto generated by tblgen. |
| std::string ParseSubtargetFeatures(const std::string &FS, |
| const std::string &CPU); |
| |
| void computeIssueWidth(); |
| |
| bool hasV4TOps() const { return ARMArchVersion >= V4T; } |
| bool hasV5TOps() const { return ARMArchVersion >= V5T; } |
| bool hasV5TEOps() const { return ARMArchVersion >= V5TE; } |
| bool hasV6Ops() const { return ARMArchVersion >= V6; } |
| bool hasV6T2Ops() const { return ARMArchVersion >= V6T2; } |
| bool hasV7Ops() const { return ARMArchVersion >= V7A; } |
| |
| bool isCortexA8() const { return ARMProcFamily == CortexA8; } |
| bool isCortexA9() const { return ARMProcFamily == CortexA9; } |
| |
| bool hasARMOps() const { return !NoARM; } |
| |
| bool hasVFP2() const { return ARMFPUType >= VFPv2; } |
| bool hasVFP3() const { return ARMFPUType >= VFPv3; } |
| bool hasNEON() const { return ARMFPUType >= NEON; } |
| bool useNEONForSinglePrecisionFP() const { |
| return hasNEON() && UseNEONForSinglePrecisionFP; } |
| bool hasDivide() const { return HasHardwareDivide; } |
| bool hasT2ExtractPack() const { return HasT2ExtractPack; } |
| bool hasDataBarrier() const { return HasDataBarrier; } |
| bool useFPVMLx() const { return !SlowFPVMLx; } |
| bool isFPBrccSlow() const { return SlowFPBrcc; } |
| bool isFPOnlySP() const { return FPOnlySP; } |
| bool prefers32BitThumb() const { return Pref32BitThumb; } |
| bool hasMPExtension() const { return HasMPExtension; } |
| |
| bool hasFP16() const { return HasFP16; } |
| bool hasD16() const { return HasD16; } |
| |
| bool isTargetDarwin() const { return TargetTriple.getOS() == Triple::Darwin; } |
| bool isTargetELF() const { return !isTargetDarwin(); } |
| |
| bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; } |
| bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; } |
| |
| bool isThumb() const { return IsThumb; } |
| bool isThumb1Only() const { return IsThumb && (ThumbMode == Thumb1); } |
| bool isThumb2() const { return IsThumb && (ThumbMode == Thumb2); } |
| bool hasThumb2() const { return ThumbMode >= Thumb2; } |
| |
| bool isR9Reserved() const { return IsR9Reserved; } |
| |
| bool useMovt() const { return UseMovt && hasV6T2Ops(); } |
| |
| bool allowsUnalignedMem() const { return AllowsUnalignedMem; } |
| |
| const std::string & getCPUString() const { return CPUString; } |
| |
| unsigned getMispredictionPenalty() const; |
| |
| /// enablePostRAScheduler - True at 'More' optimization. |
| bool enablePostRAScheduler(CodeGenOpt::Level OptLevel, |
| TargetSubtarget::AntiDepBreakMode& Mode, |
| RegClassVector& CriticalPathRCs) const; |
| |
| /// getInstrItins - Return the instruction itineraies based on subtarget |
| /// selection. |
| const InstrItineraryData &getInstrItineraryData() const { return InstrItins; } |
| |
| /// getStackAlignment - Returns the minimum alignment known to hold of the |
| /// stack frame on entry to the function and which must be maintained by every |
| /// function for this subtarget. |
| unsigned getStackAlignment() const { return stackAlignment; } |
| |
| /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect |
| /// symbol. |
| bool GVIsIndirectSymbol(const GlobalValue *GV, Reloc::Model RelocM) const; |
| }; |
| } // End llvm namespace |
| |
| #endif // ARMSUBTARGET_H |