| //===--- AArch64.cpp - AArch64 (not ARM) Helpers for Tools ------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "AArch64.h" |
| #include "clang/Driver/Driver.h" |
| #include "clang/Driver/DriverDiagnostic.h" |
| #include "clang/Driver/Options.h" |
| #include "llvm/Option/ArgList.h" |
| #include "llvm/Support/TargetParser.h" |
| |
| using namespace clang::driver; |
| using namespace clang::driver::tools; |
| using namespace clang; |
| using namespace llvm::opt; |
| |
| /// getAArch64TargetCPU - Get the (LLVM) name of the AArch64 cpu we are |
| /// targeting. Set \p A to the Arg corresponding to the -mcpu argument if it is |
| /// provided, or to nullptr otherwise. |
| std::string aarch64::getAArch64TargetCPU(const ArgList &Args, Arg *&A) { |
| std::string CPU; |
| // If we have -mcpu, use that. |
| if ((A = Args.getLastArg(options::OPT_mcpu_EQ))) { |
| StringRef Mcpu = A->getValue(); |
| CPU = Mcpu.split("+").first.lower(); |
| } |
| |
| // Handle CPU name is 'native'. |
| if (CPU == "native") |
| return llvm::sys::getHostCPUName(); |
| else if (CPU.size()) |
| return CPU; |
| |
| // Make sure we pick "cyclone" if -arch is used. |
| // FIXME: Should this be picked by checking the target triple instead? |
| if (Args.getLastArg(options::OPT_arch)) |
| return "cyclone"; |
| |
| return "generic"; |
| } |
| |
| // Decode AArch64 features from string like +[no]featureA+[no]featureB+... |
| static bool DecodeAArch64Features(const Driver &D, StringRef text, |
| std::vector<StringRef> &Features) { |
| SmallVector<StringRef, 8> Split; |
| text.split(Split, StringRef("+"), -1, false); |
| |
| for (StringRef Feature : Split) { |
| StringRef FeatureName = llvm::AArch64::getArchExtFeature(Feature); |
| if (!FeatureName.empty()) |
| Features.push_back(FeatureName); |
| else if (Feature == "neon" || Feature == "noneon") |
| D.Diag(clang::diag::err_drv_no_neon_modifier); |
| else |
| return false; |
| } |
| return true; |
| } |
| |
| // Check if the CPU name and feature modifiers in -mcpu are legal. If yes, |
| // decode CPU and feature. |
| static bool DecodeAArch64Mcpu(const Driver &D, StringRef Mcpu, StringRef &CPU, |
| std::vector<StringRef> &Features) { |
| std::pair<StringRef, StringRef> Split = Mcpu.split("+"); |
| CPU = Split.first; |
| |
| if (CPU == "native") |
| CPU = llvm::sys::getHostCPUName(); |
| |
| if (CPU == "generic") { |
| Features.push_back("+neon"); |
| } else { |
| llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseCPUArch(CPU); |
| if (!llvm::AArch64::getArchFeatures(ArchKind, Features)) |
| return false; |
| |
| unsigned Extension = llvm::AArch64::getDefaultExtensions(CPU, ArchKind); |
| if (!llvm::AArch64::getExtensionFeatures(Extension, Features)) |
| return false; |
| } |
| |
| if (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features)) |
| return false; |
| |
| return true; |
| } |
| |
| static bool |
| getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March, |
| const ArgList &Args, |
| std::vector<StringRef> &Features) { |
| std::string MarchLowerCase = March.lower(); |
| std::pair<StringRef, StringRef> Split = StringRef(MarchLowerCase).split("+"); |
| |
| llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseArch(Split.first); |
| if (ArchKind == llvm::AArch64::ArchKind::INVALID || |
| !llvm::AArch64::getArchFeatures(ArchKind, Features) || |
| (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features))) |
| return false; |
| |
| return true; |
| } |
| |
| static bool |
| getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu, |
| const ArgList &Args, |
| std::vector<StringRef> &Features) { |
| StringRef CPU; |
| std::string McpuLowerCase = Mcpu.lower(); |
| if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, Features)) |
| return false; |
| |
| return true; |
| } |
| |
| static bool |
| getAArch64MicroArchFeaturesFromMtune(const Driver &D, StringRef Mtune, |
| const ArgList &Args, |
| std::vector<StringRef> &Features) { |
| std::string MtuneLowerCase = Mtune.lower(); |
| // Check CPU name is valid |
| std::vector<StringRef> MtuneFeatures; |
| StringRef Tune; |
| if (!DecodeAArch64Mcpu(D, MtuneLowerCase, Tune, MtuneFeatures)) |
| return false; |
| |
| // Handle CPU name is 'native'. |
| if (MtuneLowerCase == "native") |
| MtuneLowerCase = llvm::sys::getHostCPUName(); |
| if (MtuneLowerCase == "cyclone") { |
| Features.push_back("+zcm"); |
| Features.push_back("+zcz"); |
| } |
| return true; |
| } |
| |
| static bool |
| getAArch64MicroArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu, |
| const ArgList &Args, |
| std::vector<StringRef> &Features) { |
| StringRef CPU; |
| std::vector<StringRef> DecodedFeature; |
| std::string McpuLowerCase = Mcpu.lower(); |
| if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, DecodedFeature)) |
| return false; |
| |
| return getAArch64MicroArchFeaturesFromMtune(D, CPU, Args, Features); |
| } |
| |
| void aarch64::getAArch64TargetFeatures(const Driver &D, const ArgList &Args, |
| std::vector<StringRef> &Features) { |
| Arg *A; |
| bool success = true; |
| // Enable NEON by default. |
| Features.push_back("+neon"); |
| if ((A = Args.getLastArg(options::OPT_march_EQ))) |
| success = getAArch64ArchFeaturesFromMarch(D, A->getValue(), Args, Features); |
| else if ((A = Args.getLastArg(options::OPT_mcpu_EQ))) |
| success = getAArch64ArchFeaturesFromMcpu(D, A->getValue(), Args, Features); |
| else if (Args.hasArg(options::OPT_arch)) |
| success = getAArch64ArchFeaturesFromMcpu(D, getAArch64TargetCPU(Args, A), |
| Args, Features); |
| |
| if (success && (A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ))) |
| success = |
| getAArch64MicroArchFeaturesFromMtune(D, A->getValue(), Args, Features); |
| else if (success && (A = Args.getLastArg(options::OPT_mcpu_EQ))) |
| success = |
| getAArch64MicroArchFeaturesFromMcpu(D, A->getValue(), Args, Features); |
| else if (success && Args.hasArg(options::OPT_arch)) |
| success = getAArch64MicroArchFeaturesFromMcpu( |
| D, getAArch64TargetCPU(Args, A), Args, Features); |
| |
| if (!success) |
| D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args); |
| |
| if (Args.getLastArg(options::OPT_mgeneral_regs_only)) { |
| Features.push_back("-fp-armv8"); |
| Features.push_back("-crypto"); |
| Features.push_back("-neon"); |
| } |
| |
| // En/disable crc |
| if (Arg *A = Args.getLastArg(options::OPT_mcrc, options::OPT_mnocrc)) { |
| if (A->getOption().matches(options::OPT_mcrc)) |
| Features.push_back("+crc"); |
| else |
| Features.push_back("-crc"); |
| } |
| |
| if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access, |
| options::OPT_munaligned_access)) |
| if (A->getOption().matches(options::OPT_mno_unaligned_access)) |
| Features.push_back("+strict-align"); |
| |
| if (Args.hasArg(options::OPT_ffixed_x18)) |
| Features.push_back("+reserve-x18"); |
| |
| if (Args.hasArg(options::OPT_ffixed_x20)) |
| Features.push_back("+reserve-x20"); |
| |
| if (Args.hasArg(options::OPT_mno_neg_immediates)) |
| Features.push_back("+no-neg-immediates"); |
| } |