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//=====---- 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/TargetSubtarget.h"
#include <string>
namespace llvm {
class GlobalValue;
class ARMSubtarget : public TargetSubtarget {
protected:
enum ARMArchEnum {
V4T, V5T, V5TE, V6, V6T2, V7A
};
enum ARMFPEnum {
None, VFPv2, VFPv3, NEON
};
enum ThumbTypeEnum {
Thumb1,
Thumb2
};
/// ARMArchVersion - ARM architecture version: V4T (base), V5T, V5TE,
/// V6, V6T2, V7A.
ARMArchEnum ARMArchVersion;
/// 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;
/// IsThumb - True if we are in thumb mode, false if in ARM mode.
bool IsThumb;
/// ThumbMode - Indicates supported Thumb version.
ThumbTypeEnum ThumbMode;
/// IsR9Reserved - True if R9 is a not available as general purpose register.
bool IsR9Reserved;
/// 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;
/// 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 Thumb.
// Change this once Thumb ldmia / stmia support is added.
return isThumb() ? 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);
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 hasVFP2() const { return ARMFPUType >= VFPv2; }
bool hasVFP3() const { return ARMFPUType >= VFPv3; }
bool hasNEON() const { return ARMFPUType >= NEON; }
bool useNEONForSinglePrecisionFP() const {
return hasNEON() && UseNEONForSinglePrecisionFP; }
bool isTargetDarwin() const { return TargetType == isDarwin; }
bool isTargetELF() const { return TargetType == isELF; }
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; }
const std::string & getCPUString() const { return CPUString; }
/// 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(GlobalValue *GV, bool isStatic) const;
};
} // End llvm namespace
#endif // ARMSUBTARGET_H
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