| //===--- AMDGPU.cpp - AMDGPU ToolChain Implementations ----------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "AMDGPU.h" |
| #include "CommonArgs.h" |
| #include "InputInfo.h" |
| #include "clang/Driver/Compilation.h" |
| #include "clang/Driver/DriverDiagnostic.h" |
| #include "llvm/Option/ArgList.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/VirtualFileSystem.h" |
| |
| using namespace clang::driver; |
| using namespace clang::driver::tools; |
| using namespace clang::driver::toolchains; |
| using namespace clang; |
| using namespace llvm::opt; |
| |
| void RocmInstallationDetector::scanLibDevicePath() { |
| assert(!LibDevicePath.empty()); |
| |
| const StringRef Suffix(".bc"); |
| const StringRef Suffix2(".amdgcn.bc"); |
| |
| std::error_code EC; |
| for (llvm::vfs::directory_iterator |
| LI = D.getVFS().dir_begin(LibDevicePath, EC), |
| LE; |
| !EC && LI != LE; LI = LI.increment(EC)) { |
| StringRef FilePath = LI->path(); |
| StringRef FileName = llvm::sys::path::filename(FilePath); |
| if (!FileName.endswith(Suffix)) |
| continue; |
| |
| StringRef BaseName; |
| if (FileName.endswith(Suffix2)) |
| BaseName = FileName.drop_back(Suffix2.size()); |
| else if (FileName.endswith(Suffix)) |
| BaseName = FileName.drop_back(Suffix.size()); |
| |
| if (BaseName == "ocml") { |
| OCML = FilePath; |
| } else if (BaseName == "ockl") { |
| OCKL = FilePath; |
| } else if (BaseName == "opencl") { |
| OpenCL = FilePath; |
| } else if (BaseName == "hip") { |
| HIP = FilePath; |
| } else if (BaseName == "oclc_finite_only_off") { |
| FiniteOnly.Off = FilePath; |
| } else if (BaseName == "oclc_finite_only_on") { |
| FiniteOnly.On = FilePath; |
| } else if (BaseName == "oclc_daz_opt_on") { |
| DenormalsAreZero.On = FilePath; |
| } else if (BaseName == "oclc_daz_opt_off") { |
| DenormalsAreZero.Off = FilePath; |
| } else if (BaseName == "oclc_correctly_rounded_sqrt_on") { |
| CorrectlyRoundedSqrt.On = FilePath; |
| } else if (BaseName == "oclc_correctly_rounded_sqrt_off") { |
| CorrectlyRoundedSqrt.Off = FilePath; |
| } else if (BaseName == "oclc_unsafe_math_on") { |
| UnsafeMath.On = FilePath; |
| } else if (BaseName == "oclc_unsafe_math_off") { |
| UnsafeMath.Off = FilePath; |
| } else if (BaseName == "oclc_wavefrontsize64_on") { |
| WavefrontSize64.On = FilePath; |
| } else if (BaseName == "oclc_wavefrontsize64_off") { |
| WavefrontSize64.Off = FilePath; |
| } else { |
| // Process all bitcode filenames that look like |
| // ocl_isa_version_XXX.amdgcn.bc |
| const StringRef DeviceLibPrefix = "oclc_isa_version_"; |
| if (!BaseName.startswith(DeviceLibPrefix)) |
| continue; |
| |
| StringRef IsaVersionNumber = |
| BaseName.drop_front(DeviceLibPrefix.size()); |
| |
| llvm::Twine GfxName = Twine("gfx") + IsaVersionNumber; |
| SmallString<8> Tmp; |
| LibDeviceMap.insert( |
| std::make_pair(GfxName.toStringRef(Tmp), FilePath.str())); |
| } |
| } |
| } |
| |
| RocmInstallationDetector::RocmInstallationDetector( |
| const Driver &D, const llvm::Triple &HostTriple, |
| const llvm::opt::ArgList &Args) |
| : D(D) { |
| struct Candidate { |
| std::string Path; |
| bool StrictChecking; |
| |
| Candidate(std::string Path, bool StrictChecking = false) |
| : Path(Path), StrictChecking(StrictChecking) {} |
| }; |
| |
| SmallVector<Candidate, 4> Candidates; |
| |
| if (Args.hasArg(clang::driver::options::OPT_rocm_path_EQ)) { |
| Candidates.emplace_back( |
| Args.getLastArgValue(clang::driver::options::OPT_rocm_path_EQ).str()); |
| } else { |
| // Try to find relative to the compiler binary. |
| const char *InstallDir = D.getInstalledDir(); |
| |
| // Check both a normal Unix prefix position of the clang binary, as well as |
| // the Windows-esque layout the ROCm packages use with the host architecture |
| // subdirectory of bin. |
| |
| // Strip off directory (usually bin) |
| StringRef ParentDir = llvm::sys::path::parent_path(InstallDir); |
| StringRef ParentName = llvm::sys::path::filename(ParentDir); |
| |
| // Some builds use bin/{host arch}, so go up again. |
| if (ParentName == "bin") { |
| ParentDir = llvm::sys::path::parent_path(ParentDir); |
| ParentName = llvm::sys::path::filename(ParentDir); |
| } |
| |
| if (ParentName == "llvm") { |
| // Some versions of the rocm llvm package install to /opt/rocm/llvm/bin |
| Candidates.emplace_back(llvm::sys::path::parent_path(ParentDir).str(), |
| /*StrictChecking=*/true); |
| } |
| |
| Candidates.emplace_back(D.SysRoot + "/opt/rocm"); |
| } |
| |
| bool NoBuiltinLibs = Args.hasArg(options::OPT_nogpulib); |
| |
| assert(LibDevicePath.empty()); |
| |
| if (Args.hasArg(clang::driver::options::OPT_hip_device_lib_path_EQ)) { |
| LibDevicePath |
| = Args.getLastArgValue(clang::driver::options::OPT_hip_device_lib_path_EQ); |
| } else if (const char *LibPathEnv = ::getenv("HIP_DEVICE_LIB_PATH")) { |
| LibDevicePath = LibPathEnv; |
| } |
| |
| auto &FS = D.getVFS(); |
| if (!LibDevicePath.empty()) { |
| // Maintain compatability with HIP flag/envvar pointing directly at the |
| // bitcode library directory. This points directly at the library path instead |
| // of the rocm root installation. |
| if (!FS.exists(LibDevicePath)) |
| return; |
| |
| scanLibDevicePath(); |
| IsValid = allGenericLibsValid() && !LibDeviceMap.empty(); |
| return; |
| } |
| |
| for (const auto &Candidate : Candidates) { |
| InstallPath = Candidate.Path; |
| if (InstallPath.empty() || !FS.exists(InstallPath)) |
| continue; |
| |
| // The install path situation in old versions of ROCm is a real mess, and |
| // use a different install layout. Multiple copies of the device libraries |
| // exist for each frontend project, and differ depending on which build |
| // system produced the packages. Standalone OpenCL builds also have a |
| // different directory structure from the ROCm OpenCL package. |
| // |
| // The desired structure is (${ROCM_ROOT} or |
| // ${OPENCL_ROOT})/amdgcn/bitcode/*, so try to detect this layout. |
| |
| // BinPath = InstallPath + "/bin"; |
| llvm::sys::path::append(IncludePath, InstallPath, "include"); |
| llvm::sys::path::append(LibDevicePath, InstallPath, "amdgcn", "bitcode"); |
| |
| // We don't need the include path for OpenCL, since clang already ships with |
| // the default header. |
| |
| bool CheckLibDevice = (!NoBuiltinLibs || Candidate.StrictChecking); |
| if (CheckLibDevice && !FS.exists(LibDevicePath)) |
| continue; |
| |
| scanLibDevicePath(); |
| |
| if (!NoBuiltinLibs) { |
| // Check that the required non-target libraries are all available. |
| if (!allGenericLibsValid()) |
| continue; |
| |
| // Check that we have found at least one libdevice that we can link in if |
| // -nobuiltinlib hasn't been specified. |
| if (LibDeviceMap.empty()) |
| continue; |
| } |
| |
| IsValid = true; |
| break; |
| } |
| } |
| |
| void RocmInstallationDetector::print(raw_ostream &OS) const { |
| if (isValid()) |
| OS << "Found ROCm installation: " << InstallPath << '\n'; |
| } |
| |
| void RocmInstallationDetector::AddHIPIncludeArgs(const ArgList &DriverArgs, |
| ArgStringList &CC1Args) const { |
| if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) { |
| // HIP header includes standard library wrapper headers under clang |
| // cuda_wrappers directory. Since these wrapper headers include_next |
| // standard C++ headers, whereas libc++ headers include_next other clang |
| // headers. The include paths have to follow this order: |
| // - wrapper include path |
| // - standard C++ include path |
| // - other clang include path |
| // Since standard C++ and other clang include paths are added in other |
| // places after this function, here we only need to make sure wrapper |
| // include path is added. |
| SmallString<128> P(D.ResourceDir); |
| llvm::sys::path::append(P, "include"); |
| llvm::sys::path::append(P, "cuda_wrappers"); |
| CC1Args.push_back("-internal-isystem"); |
| CC1Args.push_back(DriverArgs.MakeArgString(P)); |
| } |
| |
| if (DriverArgs.hasArg(options::OPT_nogpuinc)) |
| return; |
| |
| if (!isValid()) { |
| D.Diag(diag::err_drv_no_rocm_installation); |
| return; |
| } |
| |
| CC1Args.push_back("-internal-isystem"); |
| CC1Args.push_back(DriverArgs.MakeArgString(getIncludePath())); |
| CC1Args.push_back("-include"); |
| CC1Args.push_back("__clang_hip_runtime_wrapper.h"); |
| } |
| |
| void amdgpu::Linker::ConstructJob(Compilation &C, const JobAction &JA, |
| const InputInfo &Output, |
| const InputInfoList &Inputs, |
| const ArgList &Args, |
| const char *LinkingOutput) const { |
| |
| std::string Linker = getToolChain().GetProgramPath(getShortName()); |
| ArgStringList CmdArgs; |
| AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA); |
| CmdArgs.push_back("-shared"); |
| CmdArgs.push_back("-o"); |
| CmdArgs.push_back(Output.getFilename()); |
| C.addCommand( |
| std::make_unique<Command>(JA, *this, ResponseFileSupport::AtFileCurCP(), |
| Args.MakeArgString(Linker), CmdArgs, Inputs)); |
| } |
| |
| void amdgpu::getAMDGPUTargetFeatures(const Driver &D, |
| const llvm::opt::ArgList &Args, |
| std::vector<StringRef> &Features) { |
| if (const Arg *dAbi = Args.getLastArg(options::OPT_mamdgpu_debugger_abi)) |
| D.Diag(diag::err_drv_clang_unsupported) << dAbi->getAsString(Args); |
| |
| if (Args.getLastArg(options::OPT_mwavefrontsize64)) { |
| Features.push_back("-wavefrontsize16"); |
| Features.push_back("-wavefrontsize32"); |
| Features.push_back("+wavefrontsize64"); |
| } |
| if (Args.getLastArg(options::OPT_mno_wavefrontsize64)) { |
| Features.push_back("-wavefrontsize16"); |
| Features.push_back("+wavefrontsize32"); |
| Features.push_back("-wavefrontsize64"); |
| } |
| |
| handleTargetFeaturesGroup( |
| Args, Features, options::OPT_m_amdgpu_Features_Group); |
| } |
| |
| /// AMDGPU Toolchain |
| AMDGPUToolChain::AMDGPUToolChain(const Driver &D, const llvm::Triple &Triple, |
| const ArgList &Args) |
| : Generic_ELF(D, Triple, Args), |
| OptionsDefault({{options::OPT_O, "3"}, |
| {options::OPT_cl_std_EQ, "CL1.2"}}) {} |
| |
| Tool *AMDGPUToolChain::buildLinker() const { |
| return new tools::amdgpu::Linker(*this); |
| } |
| |
| DerivedArgList * |
| AMDGPUToolChain::TranslateArgs(const DerivedArgList &Args, StringRef BoundArch, |
| Action::OffloadKind DeviceOffloadKind) const { |
| |
| DerivedArgList *DAL = |
| Generic_ELF::TranslateArgs(Args, BoundArch, DeviceOffloadKind); |
| |
| // Do nothing if not OpenCL (-x cl) |
| if (!Args.getLastArgValue(options::OPT_x).equals("cl")) |
| return DAL; |
| |
| if (!DAL) |
| DAL = new DerivedArgList(Args.getBaseArgs()); |
| for (auto *A : Args) |
| DAL->append(A); |
| |
| const OptTable &Opts = getDriver().getOpts(); |
| |
| // Phase 1 (.cl -> .bc) |
| if (Args.hasArg(options::OPT_c) && Args.hasArg(options::OPT_emit_llvm)) { |
| DAL->AddFlagArg(nullptr, Opts.getOption(getTriple().isArch64Bit() |
| ? options::OPT_m64 |
| : options::OPT_m32)); |
| |
| // Have to check OPT_O4, OPT_O0 & OPT_Ofast separately |
| // as they defined that way in Options.td |
| if (!Args.hasArg(options::OPT_O, options::OPT_O0, options::OPT_O4, |
| options::OPT_Ofast)) |
| DAL->AddJoinedArg(nullptr, Opts.getOption(options::OPT_O), |
| getOptionDefault(options::OPT_O)); |
| } |
| |
| return DAL; |
| } |
| |
| bool AMDGPUToolChain::getDefaultDenormsAreZeroForTarget( |
| llvm::AMDGPU::GPUKind Kind) { |
| |
| // Assume nothing without a specific target. |
| if (Kind == llvm::AMDGPU::GK_NONE) |
| return false; |
| |
| const unsigned ArchAttr = llvm::AMDGPU::getArchAttrAMDGCN(Kind); |
| |
| // Default to enabling f32 denormals by default on subtargets where fma is |
| // fast with denormals |
| const bool BothDenormAndFMAFast = |
| (ArchAttr & llvm::AMDGPU::FEATURE_FAST_FMA_F32) && |
| (ArchAttr & llvm::AMDGPU::FEATURE_FAST_DENORMAL_F32); |
| return !BothDenormAndFMAFast; |
| } |
| |
| llvm::DenormalMode AMDGPUToolChain::getDefaultDenormalModeForType( |
| const llvm::opt::ArgList &DriverArgs, const JobAction &JA, |
| const llvm::fltSemantics *FPType) const { |
| // Denormals should always be enabled for f16 and f64. |
| if (!FPType || FPType != &llvm::APFloat::IEEEsingle()) |
| return llvm::DenormalMode::getIEEE(); |
| |
| if (JA.getOffloadingDeviceKind() == Action::OFK_HIP || |
| JA.getOffloadingDeviceKind() == Action::OFK_Cuda) { |
| auto Kind = llvm::AMDGPU::parseArchAMDGCN(JA.getOffloadingArch()); |
| if (FPType && FPType == &llvm::APFloat::IEEEsingle() && |
| DriverArgs.hasFlag(options::OPT_fcuda_flush_denormals_to_zero, |
| options::OPT_fno_cuda_flush_denormals_to_zero, |
| getDefaultDenormsAreZeroForTarget(Kind))) |
| return llvm::DenormalMode::getPreserveSign(); |
| |
| return llvm::DenormalMode::getIEEE(); |
| } |
| |
| const StringRef GpuArch = DriverArgs.getLastArgValue(options::OPT_mcpu_EQ); |
| auto Kind = llvm::AMDGPU::parseArchAMDGCN(GpuArch); |
| |
| // TODO: There are way too many flags that change this. Do we need to check |
| // them all? |
| bool DAZ = DriverArgs.hasArg(options::OPT_cl_denorms_are_zero) || |
| getDefaultDenormsAreZeroForTarget(Kind); |
| |
| // Outputs are flushed to zero (FTZ), preserving sign. Denormal inputs are |
| // also implicit treated as zero (DAZ). |
| return DAZ ? llvm::DenormalMode::getPreserveSign() : |
| llvm::DenormalMode::getIEEE(); |
| } |
| |
| bool AMDGPUToolChain::isWave64(const llvm::opt::ArgList &DriverArgs, |
| llvm::AMDGPU::GPUKind Kind) { |
| const unsigned ArchAttr = llvm::AMDGPU::getArchAttrAMDGCN(Kind); |
| static bool HasWave32 = (ArchAttr & llvm::AMDGPU::FEATURE_WAVE32); |
| |
| return !HasWave32 || DriverArgs.hasFlag( |
| options::OPT_mwavefrontsize64, options::OPT_mno_wavefrontsize64, false); |
| } |
| |
| |
| /// ROCM Toolchain |
| ROCMToolChain::ROCMToolChain(const Driver &D, const llvm::Triple &Triple, |
| const ArgList &Args) |
| : AMDGPUToolChain(D, Triple, Args), |
| RocmInstallation(D, Triple, Args) { } |
| |
| void AMDGPUToolChain::addClangTargetOptions( |
| const llvm::opt::ArgList &DriverArgs, |
| llvm::opt::ArgStringList &CC1Args, |
| Action::OffloadKind DeviceOffloadingKind) const { |
| // Default to "hidden" visibility, as object level linking will not be |
| // supported for the foreseeable future. |
| if (!DriverArgs.hasArg(options::OPT_fvisibility_EQ, |
| options::OPT_fvisibility_ms_compat)) { |
| CC1Args.push_back("-fvisibility"); |
| CC1Args.push_back("hidden"); |
| CC1Args.push_back("-fapply-global-visibility-to-externs"); |
| } |
| } |
| |
| void ROCMToolChain::addClangTargetOptions( |
| const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, |
| Action::OffloadKind DeviceOffloadingKind) const { |
| AMDGPUToolChain::addClangTargetOptions(DriverArgs, CC1Args, |
| DeviceOffloadingKind); |
| |
| // For the OpenCL case where there is no offload target, accept -nostdlib to |
| // disable bitcode linking. |
| if (DeviceOffloadingKind == Action::OFK_None && |
| DriverArgs.hasArg(options::OPT_nostdlib)) |
| return; |
| |
| if (DriverArgs.hasArg(options::OPT_nogpulib)) |
| return; |
| |
| if (!RocmInstallation.isValid()) { |
| getDriver().Diag(diag::err_drv_no_rocm_installation); |
| return; |
| } |
| |
| // Get the device name and canonicalize it |
| const StringRef GpuArch = DriverArgs.getLastArgValue(options::OPT_mcpu_EQ); |
| auto Kind = llvm::AMDGPU::parseArchAMDGCN(GpuArch); |
| const StringRef CanonArch = llvm::AMDGPU::getArchNameAMDGCN(Kind); |
| std::string LibDeviceFile = RocmInstallation.getLibDeviceFile(CanonArch); |
| if (LibDeviceFile.empty()) { |
| getDriver().Diag(diag::err_drv_no_rocm_device_lib) << GpuArch; |
| return; |
| } |
| |
| bool Wave64 = isWave64(DriverArgs, Kind); |
| |
| // TODO: There are way too many flags that change this. Do we need to check |
| // them all? |
| bool DAZ = DriverArgs.hasArg(options::OPT_cl_denorms_are_zero) || |
| getDefaultDenormsAreZeroForTarget(Kind); |
| bool FiniteOnly = DriverArgs.hasArg(options::OPT_cl_finite_math_only); |
| |
| bool UnsafeMathOpt = |
| DriverArgs.hasArg(options::OPT_cl_unsafe_math_optimizations); |
| bool FastRelaxedMath = DriverArgs.hasArg(options::OPT_cl_fast_relaxed_math); |
| bool CorrectSqrt = |
| DriverArgs.hasArg(options::OPT_cl_fp32_correctly_rounded_divide_sqrt); |
| |
| // Add the OpenCL specific bitcode library. |
| CC1Args.push_back("-mlink-builtin-bitcode"); |
| CC1Args.push_back(DriverArgs.MakeArgString(RocmInstallation.getOpenCLPath())); |
| |
| // Add the generic set of libraries. |
| RocmInstallation.addCommonBitcodeLibCC1Args( |
| DriverArgs, CC1Args, LibDeviceFile, Wave64, DAZ, FiniteOnly, |
| UnsafeMathOpt, FastRelaxedMath, CorrectSqrt); |
| } |
| |
| void RocmInstallationDetector::addCommonBitcodeLibCC1Args( |
| const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, |
| StringRef LibDeviceFile, bool Wave64, bool DAZ, bool FiniteOnly, |
| bool UnsafeMathOpt, bool FastRelaxedMath, bool CorrectSqrt) const { |
| static const char LinkBitcodeFlag[] = "-mlink-builtin-bitcode"; |
| |
| CC1Args.push_back(LinkBitcodeFlag); |
| CC1Args.push_back(DriverArgs.MakeArgString(getOCMLPath())); |
| |
| CC1Args.push_back(LinkBitcodeFlag); |
| CC1Args.push_back(DriverArgs.MakeArgString(getOCKLPath())); |
| |
| CC1Args.push_back(LinkBitcodeFlag); |
| CC1Args.push_back(DriverArgs.MakeArgString(getDenormalsAreZeroPath(DAZ))); |
| |
| CC1Args.push_back(LinkBitcodeFlag); |
| CC1Args.push_back(DriverArgs.MakeArgString( |
| getUnsafeMathPath(UnsafeMathOpt || FastRelaxedMath))); |
| |
| CC1Args.push_back(LinkBitcodeFlag); |
| CC1Args.push_back(DriverArgs.MakeArgString( |
| getFiniteOnlyPath(FiniteOnly || FastRelaxedMath))); |
| |
| CC1Args.push_back(LinkBitcodeFlag); |
| CC1Args.push_back( |
| DriverArgs.MakeArgString(getCorrectlyRoundedSqrtPath(CorrectSqrt))); |
| |
| CC1Args.push_back(LinkBitcodeFlag); |
| CC1Args.push_back(DriverArgs.MakeArgString(getWavefrontSize64Path(Wave64))); |
| |
| CC1Args.push_back(LinkBitcodeFlag); |
| CC1Args.push_back(DriverArgs.MakeArgString(LibDeviceFile)); |
| } |