clang  6.0.0svn
AArch64.cpp
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1 //===--- AArch64.cpp - AArch64 (not ARM) Helpers for Tools ------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "AArch64.h"
11 #include "clang/Driver/Driver.h"
13 #include "clang/Driver/Options.h"
14 #include "llvm/Option/ArgList.h"
15 #include "llvm/Support/TargetParser.h"
16 
17 using namespace clang::driver;
18 using namespace clang::driver::tools;
19 using namespace clang;
20 using namespace llvm::opt;
21 
22 /// getAArch64TargetCPU - Get the (LLVM) name of the AArch64 cpu we are
23 /// targeting. Set \p A to the Arg corresponding to the -mcpu argument if it is
24 /// provided, or to nullptr otherwise.
25 std::string aarch64::getAArch64TargetCPU(const ArgList &Args, Arg *&A) {
26  std::string CPU;
27  // If we have -mcpu, use that.
28  if ((A = Args.getLastArg(options::OPT_mcpu_EQ))) {
29  StringRef Mcpu = A->getValue();
30  CPU = Mcpu.split("+").first.lower();
31  }
32 
33  // Handle CPU name is 'native'.
34  if (CPU == "native")
35  return llvm::sys::getHostCPUName();
36  else if (CPU.size())
37  return CPU;
38 
39  // Make sure we pick "cyclone" if -arch is used.
40  // FIXME: Should this be picked by checking the target triple instead?
41  if (Args.getLastArg(options::OPT_arch))
42  return "cyclone";
43 
44  return "generic";
45 }
46 
47 // Decode AArch64 features from string like +[no]featureA+[no]featureB+...
48 static bool DecodeAArch64Features(const Driver &D, StringRef text,
49  std::vector<StringRef> &Features) {
51  text.split(Split, StringRef("+"), -1, false);
52 
53  for (StringRef Feature : Split) {
54  StringRef FeatureName = llvm::AArch64::getArchExtFeature(Feature);
55  if (!FeatureName.empty())
56  Features.push_back(FeatureName);
57  else if (Feature == "neon" || Feature == "noneon")
58  D.Diag(clang::diag::err_drv_no_neon_modifier);
59  else
60  return false;
61  }
62  return true;
63 }
64 
65 // Check if the CPU name and feature modifiers in -mcpu are legal. If yes,
66 // decode CPU and feature.
67 static bool DecodeAArch64Mcpu(const Driver &D, StringRef Mcpu, StringRef &CPU,
68  std::vector<StringRef> &Features) {
69  std::pair<StringRef, StringRef> Split = Mcpu.split("+");
70  CPU = Split.first;
71 
72  if (CPU == "generic") {
73  Features.push_back("+neon");
74  } else {
75  llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseCPUArch(CPU);
76  if (!llvm::AArch64::getArchFeatures(ArchKind, Features))
77  return false;
78 
79  unsigned Extension = llvm::AArch64::getDefaultExtensions(CPU, ArchKind);
80  if (!llvm::AArch64::getExtensionFeatures(Extension, Features))
81  return false;
82  }
83 
84  if (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features))
85  return false;
86 
87  return true;
88 }
89 
90 static bool
91 getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March,
92  const ArgList &Args,
93  std::vector<StringRef> &Features) {
94  std::string MarchLowerCase = March.lower();
95  std::pair<StringRef, StringRef> Split = StringRef(MarchLowerCase).split("+");
96 
97  llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseArch(Split.first);
98  if (ArchKind == llvm::AArch64::ArchKind::INVALID ||
99  !llvm::AArch64::getArchFeatures(ArchKind, Features) ||
100  (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features)))
101  return false;
102 
103  return true;
104 }
105 
106 static bool
107 getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
108  const ArgList &Args,
109  std::vector<StringRef> &Features) {
110  StringRef CPU;
111  std::string McpuLowerCase = Mcpu.lower();
112  if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, Features))
113  return false;
114 
115  return true;
116 }
117 
118 static bool
120  const ArgList &Args,
121  std::vector<StringRef> &Features) {
122  std::string MtuneLowerCase = Mtune.lower();
123  // Check CPU name is valid
124  std::vector<StringRef> MtuneFeatures;
125  StringRef Tune;
126  if (!DecodeAArch64Mcpu(D, MtuneLowerCase, Tune, MtuneFeatures))
127  return false;
128 
129  // Handle CPU name is 'native'.
130  if (MtuneLowerCase == "native")
131  MtuneLowerCase = llvm::sys::getHostCPUName();
132  if (MtuneLowerCase == "cyclone") {
133  Features.push_back("+zcm");
134  Features.push_back("+zcz");
135  }
136  return true;
137 }
138 
139 static bool
141  const ArgList &Args,
142  std::vector<StringRef> &Features) {
143  StringRef CPU;
144  std::vector<StringRef> DecodedFeature;
145  std::string McpuLowerCase = Mcpu.lower();
146  if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, DecodedFeature))
147  return false;
148 
149  return getAArch64MicroArchFeaturesFromMtune(D, CPU, Args, Features);
150 }
151 
152 void aarch64::getAArch64TargetFeatures(const Driver &D, const ArgList &Args,
153  std::vector<StringRef> &Features) {
154  Arg *A;
155  bool success = true;
156  // Enable NEON by default.
157  Features.push_back("+neon");
158  if ((A = Args.getLastArg(options::OPT_march_EQ)))
159  success = getAArch64ArchFeaturesFromMarch(D, A->getValue(), Args, Features);
160  else if ((A = Args.getLastArg(options::OPT_mcpu_EQ)))
161  success = getAArch64ArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
162  else if (Args.hasArg(options::OPT_arch))
164  Args, Features);
165 
166  if (success && (A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)))
167  success =
168  getAArch64MicroArchFeaturesFromMtune(D, A->getValue(), Args, Features);
169  else if (success && (A = Args.getLastArg(options::OPT_mcpu_EQ)))
170  success =
171  getAArch64MicroArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
172  else if (success && Args.hasArg(options::OPT_arch))
174  D, getAArch64TargetCPU(Args, A), Args, Features);
175 
176  if (!success)
177  D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
178 
179  if (Args.getLastArg(options::OPT_mgeneral_regs_only)) {
180  Features.push_back("-fp-armv8");
181  Features.push_back("-crypto");
182  Features.push_back("-neon");
183  }
184 
185  // En/disable crc
186  if (Arg *A = Args.getLastArg(options::OPT_mcrc, options::OPT_mnocrc)) {
187  if (A->getOption().matches(options::OPT_mcrc))
188  Features.push_back("+crc");
189  else
190  Features.push_back("-crc");
191  }
192 
193  if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
194  options::OPT_munaligned_access))
195  if (A->getOption().matches(options::OPT_mno_unaligned_access))
196  Features.push_back("+strict-align");
197 
198  if (Args.hasArg(options::OPT_ffixed_x18))
199  Features.push_back("+reserve-x18");
200 
201  if (Args.hasArg(options::OPT_mno_neg_immediates))
202  Features.push_back("+no-neg-immediates");
203 }
static bool DecodeAArch64Mcpu(const Driver &D, StringRef Mcpu, StringRef &CPU, std::vector< StringRef > &Features)
Definition: AArch64.cpp:67
static bool getAArch64MicroArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu, const ArgList &Args, std::vector< StringRef > &Features)
Definition: AArch64.cpp:140
DiagnosticBuilder Diag(unsigned DiagID) const
Definition: Driver.h:116
static bool DecodeAArch64Features(const Driver &D, StringRef text, std::vector< StringRef > &Features)
Definition: AArch64.cpp:48
std::string getAArch64TargetCPU(const llvm::opt::ArgList &Args, llvm::opt::Arg *&A)
Driver - Encapsulate logic for constructing compilation processes from a set of gcc-driver-like comma...
Definition: Driver.h:65
static bool getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu, const ArgList &Args, std::vector< StringRef > &Features)
Definition: AArch64.cpp:107
static bool getAArch64MicroArchFeaturesFromMtune(const Driver &D, StringRef Mtune, const ArgList &Args, std::vector< StringRef > &Features)
Definition: AArch64.cpp:119
void getAArch64TargetFeatures(const Driver &D, const llvm::opt::ArgList &Args, std::vector< llvm::StringRef > &Features)
Dataflow Directional Tag Classes.
static bool getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March, const ArgList &Args, std::vector< StringRef > &Features)
Definition: AArch64.cpp:91