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 NEON is available use for FP
46 bool UseNEONForSinglePrecisionFP;
48 /// IsThumb - True if we are in thumb mode, false if in ARM mode.
51 /// ThumbMode - Indicates supported Thumb version.
52 ThumbTypeEnum ThumbMode;
54 /// IsR9Reserved - True if R9 is a not available as general purpose register.
57 /// stackAlignment - The minimum alignment known to hold of the stack frame on
58 /// entry to the function and which must be maintained by every function.
59 unsigned stackAlignment;
61 /// CPUString - String name of used CPU.
62 std::string CPUString;
64 /// Selected instruction itineraries (one entry per itinerary class.)
65 InstrItineraryData InstrItins;
74 ARM_ABI_AAPCS // ARM EABI
77 /// This constructor initializes the data members to match that
78 /// of the specified triple.
80 ARMSubtarget(const std::string &TT, const std::string &FS, bool isThumb);
82 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
83 /// that still makes it profitable to inline the call.
84 unsigned getMaxInlineSizeThreshold() const {
85 // FIXME: For now, we don't lower memcpy's to loads / stores for Thumb.
86 // Change this once Thumb ldmia / stmia support is added.
87 return isThumb() ? 0 : 64;
89 /// ParseSubtargetFeatures - Parses features string setting specified
90 /// subtarget options. Definition of function is auto generated by tblgen.
91 std::string ParseSubtargetFeatures(const std::string &FS,
92 const std::string &CPU);
94 bool hasV4TOps() const { return ARMArchVersion >= V4T; }
95 bool hasV5TOps() const { return ARMArchVersion >= V5T; }
96 bool hasV5TEOps() const { return ARMArchVersion >= V5TE; }
97 bool hasV6Ops() const { return ARMArchVersion >= V6; }
98 bool hasV6T2Ops() const { return ARMArchVersion >= V6T2; }
99 bool hasV7Ops() const { return ARMArchVersion >= V7A; }
101 bool hasVFP2() const { return ARMFPUType >= VFPv2; }
102 bool hasVFP3() const { return ARMFPUType >= VFPv3; }
103 bool hasNEON() const { return ARMFPUType >= NEON; }
104 bool useNEONForSinglePrecisionFP() const {
105 return hasNEON() && UseNEONForSinglePrecisionFP; }
107 bool isTargetDarwin() const { return TargetType == isDarwin; }
108 bool isTargetELF() const { return TargetType == isELF; }
110 bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; }
111 bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; }
113 bool isThumb() const { return IsThumb; }
114 bool isThumb1Only() const { return IsThumb && (ThumbMode == Thumb1); }
115 bool isThumb2() const { return IsThumb && (ThumbMode == Thumb2); }
116 bool hasThumb2() const { return ThumbMode >= Thumb2; }
118 bool isR9Reserved() const { return IsR9Reserved; }
120 const std::string & getCPUString() const { return CPUString; }
122 /// getInstrItins - Return the instruction itineraies based on subtarget
124 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
126 /// getStackAlignment - Returns the minimum alignment known to hold of the
127 /// stack frame on entry to the function and which must be maintained by every
128 /// function for this subtarget.
129 unsigned getStackAlignment() const { return stackAlignment; }
131 } // End llvm namespace
133 #endif // ARMSUBTARGET_H