1 //=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- C++ -*--====//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the ARM specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #ifndef ARMSUBTARGET_H
15 #define ARMSUBTARGET_H
17 #include "llvm/Target/TargetInstrItineraries.h"
18 #include "llvm/Target/TargetSubtarget.h"
23 class ARMSubtarget : public TargetSubtarget {
26 V4T, V5T, V5TE, V6, V6T2, V7A
30 None, VFPv2, VFPv3, NEON
38 /// ARMArchVersion - ARM architecture version: V4T (base), V5T, V5TE,
40 ARMArchEnum ARMArchVersion;
42 /// ARMFPUType - Floating Point Unit type.
45 /// UseNEONForSinglePrecisionFP - if the NEONFP attribute has been
46 /// specified. Use the method useNEONForSinglePrecisionFP() to
47 /// determine if NEON should actually be used.
48 bool UseNEONForSinglePrecisionFP;
50 /// IsThumb - True if we are in thumb mode, false if in ARM mode.
53 /// ThumbMode - Indicates supported Thumb version.
54 ThumbTypeEnum ThumbMode;
56 /// IsR9Reserved - True if R9 is a not available as general purpose register.
59 /// stackAlignment - The minimum alignment known to hold of the stack frame on
60 /// entry to the function and which must be maintained by every function.
61 unsigned stackAlignment;
63 /// CPUString - String name of used CPU.
64 std::string CPUString;
66 /// Selected instruction itineraries (one entry per itinerary class.)
67 InstrItineraryData InstrItins;
76 ARM_ABI_AAPCS // ARM EABI
79 /// This constructor initializes the data members to match that
80 /// of the specified triple.
82 ARMSubtarget(const std::string &TT, const std::string &FS, bool isThumb);
84 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
85 /// that still makes it profitable to inline the call.
86 unsigned getMaxInlineSizeThreshold() const {
87 // FIXME: For now, we don't lower memcpy's to loads / stores for Thumb.
88 // Change this once Thumb ldmia / stmia support is added.
89 return isThumb() ? 0 : 64;
91 /// ParseSubtargetFeatures - Parses features string setting specified
92 /// subtarget options. Definition of function is auto generated by tblgen.
93 std::string ParseSubtargetFeatures(const std::string &FS,
94 const std::string &CPU);
96 bool hasV4TOps() const { return ARMArchVersion >= V4T; }
97 bool hasV5TOps() const { return ARMArchVersion >= V5T; }
98 bool hasV5TEOps() const { return ARMArchVersion >= V5TE; }
99 bool hasV6Ops() const { return ARMArchVersion >= V6; }
100 bool hasV6T2Ops() const { return ARMArchVersion >= V6T2; }
101 bool hasV7Ops() const { return ARMArchVersion >= V7A; }
103 bool hasVFP2() const { return ARMFPUType >= VFPv2; }
104 bool hasVFP3() const { return ARMFPUType >= VFPv3; }
105 bool hasNEON() const { return ARMFPUType >= NEON; }
106 bool useNEONForSinglePrecisionFP() const {
107 return hasNEON() && UseNEONForSinglePrecisionFP; }
109 bool isTargetDarwin() const { return TargetType == isDarwin; }
110 bool isTargetELF() const { return TargetType == isELF; }
112 bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; }
113 bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; }
115 bool isThumb() const { return IsThumb; }
116 bool isThumb1Only() const { return IsThumb && (ThumbMode == Thumb1); }
117 bool isThumb2() const { return IsThumb && (ThumbMode == Thumb2); }
118 bool hasThumb2() const { return ThumbMode >= Thumb2; }
120 bool isR9Reserved() const { return IsR9Reserved; }
122 const std::string & getCPUString() const { return CPUString; }
124 /// getInstrItins - Return the instruction itineraies based on subtarget
126 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
128 /// getStackAlignment - Returns the minimum alignment known to hold of the
129 /// stack frame on entry to the function and which must be maintained by every
130 /// function for this subtarget.
131 unsigned getStackAlignment() const { return stackAlignment; }
133 } // End llvm namespace
135 #endif // ARMSUBTARGET_H