1 //===--- AArch64.cpp - AArch64 (not ARM) Helpers for Tools ------*- 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 //===----------------------------------------------------------------------===//
11 #include "clang/Driver/Driver.h"
12 #include "clang/Driver/DriverDiagnostic.h"
13 #include "clang/Driver/Options.h"
14 #include "llvm/Option/ArgList.h"
15 #include "llvm/Support/TargetParser.h"
17 using namespace clang::driver;
18 using namespace clang::driver::tools;
19 using namespace clang;
20 using namespace llvm::opt;
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) {
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();
33 // Handle CPU name is 'native'.
35 return llvm::sys::getHostCPUName();
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))
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) {
50 SmallVector<StringRef, 8> Split;
51 text.split(Split, StringRef("+"), -1, false);
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);
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("+");
73 CPU = llvm::sys::getHostCPUName();
75 if (CPU == "generic") {
76 Features.push_back("+neon");
78 llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseCPUArch(CPU);
79 if (!llvm::AArch64::getArchFeatures(ArchKind, Features))
82 unsigned Extension = llvm::AArch64::getDefaultExtensions(CPU, ArchKind);
83 if (!llvm::AArch64::getExtensionFeatures(Extension, Features))
87 if (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features))
94 getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March,
96 std::vector<StringRef> &Features) {
97 std::string MarchLowerCase = March.lower();
98 std::pair<StringRef, StringRef> Split = StringRef(MarchLowerCase).split("+");
100 llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseArch(Split.first);
101 if (ArchKind == llvm::AArch64::ArchKind::INVALID ||
102 !llvm::AArch64::getArchFeatures(ArchKind, Features) ||
103 (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features)))
110 getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
112 std::vector<StringRef> &Features) {
114 std::string McpuLowerCase = Mcpu.lower();
115 if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, Features))
122 getAArch64MicroArchFeaturesFromMtune(const Driver &D, StringRef Mtune,
124 std::vector<StringRef> &Features) {
125 std::string MtuneLowerCase = Mtune.lower();
126 // Check CPU name is valid
127 std::vector<StringRef> MtuneFeatures;
129 if (!DecodeAArch64Mcpu(D, MtuneLowerCase, Tune, MtuneFeatures))
132 // Handle CPU name is 'native'.
133 if (MtuneLowerCase == "native")
134 MtuneLowerCase = llvm::sys::getHostCPUName();
135 if (MtuneLowerCase == "cyclone") {
136 Features.push_back("+zcm");
137 Features.push_back("+zcz");
143 getAArch64MicroArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
145 std::vector<StringRef> &Features) {
147 std::vector<StringRef> DecodedFeature;
148 std::string McpuLowerCase = Mcpu.lower();
149 if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, DecodedFeature))
152 return getAArch64MicroArchFeaturesFromMtune(D, CPU, Args, Features);
155 void aarch64::getAArch64TargetFeatures(const Driver &D, const ArgList &Args,
156 std::vector<StringRef> &Features) {
159 // Enable NEON by default.
160 Features.push_back("+neon");
161 if ((A = Args.getLastArg(options::OPT_march_EQ)))
162 success = getAArch64ArchFeaturesFromMarch(D, A->getValue(), Args, Features);
163 else if ((A = Args.getLastArg(options::OPT_mcpu_EQ)))
164 success = getAArch64ArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
165 else if (Args.hasArg(options::OPT_arch))
166 success = getAArch64ArchFeaturesFromMcpu(D, getAArch64TargetCPU(Args, A),
169 if (success && (A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)))
171 getAArch64MicroArchFeaturesFromMtune(D, A->getValue(), Args, Features);
172 else if (success && (A = Args.getLastArg(options::OPT_mcpu_EQ)))
174 getAArch64MicroArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
175 else if (success && Args.hasArg(options::OPT_arch))
176 success = getAArch64MicroArchFeaturesFromMcpu(
177 D, getAArch64TargetCPU(Args, A), Args, Features);
180 D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
182 if (Args.getLastArg(options::OPT_mgeneral_regs_only)) {
183 Features.push_back("-fp-armv8");
184 Features.push_back("-crypto");
185 Features.push_back("-neon");
189 if (Arg *A = Args.getLastArg(options::OPT_mcrc, options::OPT_mnocrc)) {
190 if (A->getOption().matches(options::OPT_mcrc))
191 Features.push_back("+crc");
193 Features.push_back("-crc");
196 if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
197 options::OPT_munaligned_access))
198 if (A->getOption().matches(options::OPT_mno_unaligned_access))
199 Features.push_back("+strict-align");
201 if (Args.hasArg(options::OPT_ffixed_x18))
202 Features.push_back("+reserve-x18");
204 if (Args.hasArg(options::OPT_ffixed_x20))
205 Features.push_back("+reserve-x20");
207 if (Args.hasArg(options::OPT_mno_neg_immediates))
208 Features.push_back("+no-neg-immediates");