David L. Jones | ecc6de3 | 2017-02-24 00:28:01 +0000 | [diff] [blame] | 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 | |
David L. Jones | f561aba | 2017-03-08 01:02:16 +0000 | [diff] [blame] | 10 | #include "AArch64.h" |
David L. Jones | ecc6de3 | 2017-02-24 00:28:01 +0000 | [diff] [blame] | 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" |
| 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 or -mtune |
| 24 | /// arguments if they are provided, or to nullptr otherwise. |
| 25 | std::string aarch64::getAArch64TargetCPU(const ArgList &Args, Arg *&A) { |
| 26 | std::string CPU; |
| 27 | // If we have -mtune or -mcpu, use that. |
| 28 | if ((A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ))) { |
| 29 | CPU = StringRef(A->getValue()).lower(); |
| 30 | } else if ((A = Args.getLastArg(options::OPT_mcpu_EQ))) { |
| 31 | StringRef Mcpu = A->getValue(); |
| 32 | CPU = Mcpu.split("+").first.lower(); |
| 33 | } |
| 34 | |
| 35 | // Handle CPU name is 'native'. |
| 36 | if (CPU == "native") |
| 37 | return llvm::sys::getHostCPUName(); |
| 38 | else if (CPU.size()) |
| 39 | return CPU; |
| 40 | |
| 41 | // Make sure we pick "cyclone" if -arch is used. |
| 42 | // FIXME: Should this be picked by checking the target triple instead? |
| 43 | if (Args.getLastArg(options::OPT_arch)) |
| 44 | return "cyclone"; |
| 45 | |
| 46 | return "generic"; |
| 47 | } |
| 48 | |
| 49 | // Decode AArch64 features from string like +[no]featureA+[no]featureB+... |
| 50 | static bool DecodeAArch64Features(const Driver &D, StringRef text, |
| 51 | std::vector<StringRef> &Features) { |
| 52 | SmallVector<StringRef, 8> Split; |
| 53 | text.split(Split, StringRef("+"), -1, false); |
| 54 | |
| 55 | for (StringRef Feature : Split) { |
| 56 | StringRef FeatureName = llvm::AArch64::getArchExtFeature(Feature); |
| 57 | if (!FeatureName.empty()) |
| 58 | Features.push_back(FeatureName); |
| 59 | else if (Feature == "neon" || Feature == "noneon") |
| 60 | D.Diag(clang::diag::err_drv_no_neon_modifier); |
| 61 | else |
| 62 | return false; |
| 63 | } |
| 64 | return true; |
| 65 | } |
| 66 | |
| 67 | // Check if the CPU name and feature modifiers in -mcpu are legal. If yes, |
| 68 | // decode CPU and feature. |
| 69 | static bool DecodeAArch64Mcpu(const Driver &D, StringRef Mcpu, StringRef &CPU, |
| 70 | std::vector<StringRef> &Features) { |
| 71 | std::pair<StringRef, StringRef> Split = Mcpu.split("+"); |
| 72 | CPU = Split.first; |
| 73 | |
| 74 | if (CPU == "generic") { |
| 75 | Features.push_back("+neon"); |
| 76 | } else { |
Florian Hahn | ef5bbd6 | 2017-07-27 16:28:39 +0000 | [diff] [blame^] | 77 | llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseCPUArch(CPU); |
David L. Jones | ecc6de3 | 2017-02-24 00:28:01 +0000 | [diff] [blame] | 78 | if (!llvm::AArch64::getArchFeatures(ArchKind, Features)) |
| 79 | return false; |
| 80 | |
| 81 | unsigned Extension = llvm::AArch64::getDefaultExtensions(CPU, ArchKind); |
| 82 | if (!llvm::AArch64::getExtensionFeatures(Extension, Features)) |
| 83 | return false; |
| 84 | } |
| 85 | |
| 86 | if (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features)) |
| 87 | return false; |
| 88 | |
| 89 | return true; |
| 90 | } |
| 91 | |
| 92 | static bool |
| 93 | getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March, |
| 94 | const ArgList &Args, |
| 95 | std::vector<StringRef> &Features) { |
| 96 | std::string MarchLowerCase = March.lower(); |
| 97 | std::pair<StringRef, StringRef> Split = StringRef(MarchLowerCase).split("+"); |
| 98 | |
Florian Hahn | ef5bbd6 | 2017-07-27 16:28:39 +0000 | [diff] [blame^] | 99 | llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseArch(Split.first); |
| 100 | if (ArchKind == llvm::AArch64::ArchKind::INVALID || |
David L. Jones | ecc6de3 | 2017-02-24 00:28:01 +0000 | [diff] [blame] | 101 | !llvm::AArch64::getArchFeatures(ArchKind, Features) || |
| 102 | (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features))) |
| 103 | return false; |
| 104 | |
| 105 | return true; |
| 106 | } |
| 107 | |
| 108 | static bool |
| 109 | getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu, |
| 110 | const ArgList &Args, |
| 111 | std::vector<StringRef> &Features) { |
| 112 | StringRef CPU; |
| 113 | std::string McpuLowerCase = Mcpu.lower(); |
| 114 | if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, Features)) |
| 115 | return false; |
| 116 | |
| 117 | return true; |
| 118 | } |
| 119 | |
| 120 | static bool |
| 121 | getAArch64MicroArchFeaturesFromMtune(const Driver &D, StringRef Mtune, |
| 122 | const ArgList &Args, |
| 123 | std::vector<StringRef> &Features) { |
| 124 | std::string MtuneLowerCase = Mtune.lower(); |
| 125 | // Handle CPU name is 'native'. |
| 126 | if (MtuneLowerCase == "native") |
| 127 | MtuneLowerCase = llvm::sys::getHostCPUName(); |
| 128 | if (MtuneLowerCase == "cyclone") { |
| 129 | Features.push_back("+zcm"); |
| 130 | Features.push_back("+zcz"); |
| 131 | } |
| 132 | return true; |
| 133 | } |
| 134 | |
| 135 | static bool |
| 136 | getAArch64MicroArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu, |
| 137 | const ArgList &Args, |
| 138 | std::vector<StringRef> &Features) { |
| 139 | StringRef CPU; |
| 140 | std::vector<StringRef> DecodedFeature; |
| 141 | std::string McpuLowerCase = Mcpu.lower(); |
| 142 | if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, DecodedFeature)) |
| 143 | return false; |
| 144 | |
| 145 | return getAArch64MicroArchFeaturesFromMtune(D, CPU, Args, Features); |
| 146 | } |
| 147 | |
| 148 | void aarch64::getAArch64TargetFeatures(const Driver &D, const ArgList &Args, |
| 149 | std::vector<StringRef> &Features) { |
| 150 | Arg *A; |
| 151 | bool success = true; |
| 152 | // Enable NEON by default. |
| 153 | Features.push_back("+neon"); |
| 154 | if ((A = Args.getLastArg(options::OPT_march_EQ))) |
| 155 | success = getAArch64ArchFeaturesFromMarch(D, A->getValue(), Args, Features); |
| 156 | else if ((A = Args.getLastArg(options::OPT_mcpu_EQ))) |
| 157 | success = getAArch64ArchFeaturesFromMcpu(D, A->getValue(), Args, Features); |
| 158 | else if (Args.hasArg(options::OPT_arch)) |
| 159 | success = getAArch64ArchFeaturesFromMcpu(D, getAArch64TargetCPU(Args, A), |
| 160 | Args, Features); |
| 161 | |
| 162 | if (success && (A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ))) |
| 163 | success = |
| 164 | getAArch64MicroArchFeaturesFromMtune(D, A->getValue(), Args, Features); |
| 165 | else if (success && (A = Args.getLastArg(options::OPT_mcpu_EQ))) |
| 166 | success = |
| 167 | getAArch64MicroArchFeaturesFromMcpu(D, A->getValue(), Args, Features); |
| 168 | else if (success && Args.hasArg(options::OPT_arch)) |
| 169 | success = getAArch64MicroArchFeaturesFromMcpu( |
| 170 | D, getAArch64TargetCPU(Args, A), Args, Features); |
| 171 | |
| 172 | if (!success) |
| 173 | D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args); |
| 174 | |
| 175 | if (Args.getLastArg(options::OPT_mgeneral_regs_only)) { |
| 176 | Features.push_back("-fp-armv8"); |
| 177 | Features.push_back("-crypto"); |
| 178 | Features.push_back("-neon"); |
| 179 | } |
| 180 | |
| 181 | // En/disable crc |
| 182 | if (Arg *A = Args.getLastArg(options::OPT_mcrc, options::OPT_mnocrc)) { |
| 183 | if (A->getOption().matches(options::OPT_mcrc)) |
| 184 | Features.push_back("+crc"); |
| 185 | else |
| 186 | Features.push_back("-crc"); |
| 187 | } |
| 188 | |
| 189 | if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access, |
| 190 | options::OPT_munaligned_access)) |
| 191 | if (A->getOption().matches(options::OPT_mno_unaligned_access)) |
| 192 | Features.push_back("+strict-align"); |
| 193 | |
| 194 | if (Args.hasArg(options::OPT_ffixed_x18)) |
| 195 | Features.push_back("+reserve-x18"); |
Sanne Wouda | 784004e | 2017-03-27 15:34:52 +0000 | [diff] [blame] | 196 | |
| 197 | if (Args.hasArg(options::OPT_mno_neg_immediates)) |
| 198 | Features.push_back("+no-neg-immediates"); |
David L. Jones | ecc6de3 | 2017-02-24 00:28:01 +0000 | [diff] [blame] | 199 | } |