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