1 //===-- ARMSubtarget.cpp - ARM Subtarget Information ------------*- 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 implements the ARM specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #include "ARMSubtarget.h"
15 #include "ARMGenSubtarget.inc"
16 #include "llvm/GlobalValue.h"
17 #include "llvm/Target/TargetOptions.h"
18 #include "llvm/Support/CommandLine.h"
22 ReserveR9("arm-reserve-r9", cl::Hidden,
23 cl::desc("Reserve R9, making it unavailable as GPR"));
25 ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
29 , UseNEONForSinglePrecisionFP(false)
32 , IsR9Reserved(ReserveR9)
34 , CPUString("generic")
35 , TargetType(isELF) // Default to ELF unless otherwise specified.
36 , TargetABI(ARM_ABI_APCS) {
37 // default to soft float ABI
38 if (FloatABIType == FloatABI::Default)
39 FloatABIType = FloatABI::Soft;
41 // Determine default and user specified characteristics
43 // Parse features string.
44 CPUString = ParseSubtargetFeatures(FS, CPUString);
46 // Set the boolean corresponding to the current target triple, or the default
47 // if one cannot be determined, to true.
48 unsigned Len = TT.length();
51 if (Len >= 5 && TT.substr(0, 4) == "armv")
53 else if (Len >= 6 && TT.substr(0, 5) == "thumb") {
55 if (Len >= 7 && TT[5] == 'v')
59 unsigned SubVer = TT[Idx];
60 if (SubVer > '4' && SubVer <= '9') {
63 } else if (SubVer == '6') {
65 if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
66 ARMArchVersion = V6T2;
67 } else if (SubVer == '5') {
69 if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
70 ARMArchVersion = V5TE;
72 if (ARMArchVersion >= V6T2)
77 // Thumb2 implies at least V6T2.
78 if (ARMArchVersion < V6T2 && ThumbMode >= Thumb2)
79 ARMArchVersion = V6T2;
82 if (TT.find("-darwin") != std::string::npos)
84 TargetType = isDarwin;
87 if (TT.find("eabi") != std::string::npos)
88 TargetABI = ARM_ABI_AAPCS;
94 IsR9Reserved = ReserveR9 | (ARMArchVersion < V6);
97 /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol.
99 ARMSubtarget::GVIsIndirectSymbol(GlobalValue *GV, Reloc::Model RelocM) const {
100 if (RelocM == Reloc::Static)
103 // GV with ghost linkage (in JIT lazy compilation mode) do not require an
104 // extra load from stub.
105 bool isDecl = GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode();
107 if (!isTargetDarwin()) {
108 // Extra load is needed for all externally visible.
109 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
113 if (RelocM == Reloc::PIC_) {
114 // If this is a strong reference to a definition, it is definitely not
116 if (!isDecl && !GV->isWeakForLinker())
119 // Unless we have a symbol with hidden visibility, we have to go through a
120 // normal $non_lazy_ptr stub because this symbol might be resolved late.
121 if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference.
124 // If symbol visibility is hidden, we have a stub for common symbol
125 // references and external declarations.
126 if (isDecl || GV->hasCommonLinkage())
127 // Hidden $non_lazy_ptr reference.
132 // If this is a strong reference to a definition, it is definitely not
134 if (!isDecl && !GV->isWeakForLinker())
137 // Unless we have a symbol with hidden visibility, we have to go through a
138 // normal $non_lazy_ptr stub because this symbol might be resolved late.
139 if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference.