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("+");
72 if (CPU == "generic") {
73 Features.push_back("+neon");
75 llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseCPUArch(CPU);
76 if (!llvm::AArch64::getArchFeatures(ArchKind, Features))
79 unsigned Extension = llvm::AArch64::getDefaultExtensions(CPU, ArchKind);
80 if (!llvm::AArch64::getExtensionFeatures(Extension, Features))
84 if (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features))
91 getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March,
93 std::vector<StringRef> &Features) {
94 std::string MarchLowerCase = March.lower();
95 std::pair<StringRef, StringRef> Split = StringRef(MarchLowerCase).split("+");
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)))
107 getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
109 std::vector<StringRef> &Features) {
111 std::string McpuLowerCase = Mcpu.lower();
112 if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, Features))
119 getAArch64MicroArchFeaturesFromMtune(const Driver &D, StringRef Mtune,
121 std::vector<StringRef> &Features) {
122 std::string MtuneLowerCase = Mtune.lower();
123 // Check CPU name is valid
124 std::vector<StringRef> MtuneFeatures;
126 if (!DecodeAArch64Mcpu(D, MtuneLowerCase, Tune, MtuneFeatures))
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");
140 getAArch64MicroArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
142 std::vector<StringRef> &Features) {
144 std::vector<StringRef> DecodedFeature;
145 std::string McpuLowerCase = Mcpu.lower();
146 if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, DecodedFeature))
149 return getAArch64MicroArchFeaturesFromMtune(D, CPU, Args, Features);
152 void aarch64::getAArch64TargetFeatures(const Driver &D, const ArgList &Args,
153 std::vector<StringRef> &Features) {
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))
163 success = getAArch64ArchFeaturesFromMcpu(D, getAArch64TargetCPU(Args, A),
166 if (success && (A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)))
168 getAArch64MicroArchFeaturesFromMtune(D, A->getValue(), Args, Features);
169 else if (success && (A = Args.getLastArg(options::OPT_mcpu_EQ)))
171 getAArch64MicroArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
172 else if (success && Args.hasArg(options::OPT_arch))
173 success = getAArch64MicroArchFeaturesFromMcpu(
174 D, getAArch64TargetCPU(Args, A), Args, Features);
177 D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
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");
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");
190 Features.push_back("-crc");
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");
198 if (Args.hasArg(options::OPT_ffixed_x18))
199 Features.push_back("+reserve-x18");
201 if (Args.hasArg(options::OPT_mno_neg_immediates))
202 Features.push_back("+no-neg-immediates");