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for all the processors where I have tried it, and even when it might not help performance, the cost is quite low. The opportunities for duplicating indirect branches are limited by other factors so code size does not change much due to tail duplicating indirect branches aggressively. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90144 91177308-0d34-0410-b5e6-96231b3b80d8
157 lines
5.3 KiB
C++
157 lines
5.3 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 "ARMBaseRegisterInfo.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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V4T, V5T, V5TE, V6, V6T2, V7A
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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: V4T (base), V5T, V5TE,
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/// V6, V6T2, V7A.
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ARMArchEnum ARMArchVersion;
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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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/// 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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/// 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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/// 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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/// 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 Thumb.
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// Change this once Thumb ldmia / stmia support is added.
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return isThumb() ? 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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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 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 isTargetDarwin() const { return TargetType == isDarwin; }
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bool isTargetELF() const { return TargetType == isELF; }
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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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const std::string & getCPUString() const { return CPUString; }
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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(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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