// For amdgcn the inputs of the linker job are device bitcode and output is
// object file. It calls llvm-link, opt, llc, then lld steps.
void AMDGCN::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
assert(getToolChain().getTriple().getArch() == llvm::Triple::amdgcn &&
"Unsupported target");
std::string SubArchName = JA.getOffloadingArch();
assert(StringRef(SubArchName).startswith("gfx") && "Unsupported sub arch");
// Prefix for temporary file name.
std::string Prefix =
llvm::sys::path::stem(Inputs[0].getFilename()).str() + "-" + SubArchName;
// Each command outputs different files.
const char *LLVMLinkCommand =
constructLLVMLinkCommand(C, JA, Inputs, Args, SubArchName, Prefix);
const char *OptCommand = constructOptCommand(C, JA, Inputs, Args, SubArchName,
Prefix, LLVMLinkCommand);
const char *LlcCommand =
constructLlcCommand(C, JA, Inputs, Args, SubArchName, Prefix, OptCommand);
constructLldCommand(C, JA, Inputs, Output, Args, LlcCommand);
}
void NVPTX::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
const auto &TC =
static_cast<const toolchains::CudaToolChain &>(getToolChain());
assert(TC.getTriple().isNVPTX() && "Wrong platform");
StringRef GPUArchName;
// If this is an OpenMP action we need to extract the device architecture
// from the -march=arch option. This option may come from -Xopenmp-target
// flag or the default value.
if (JA.isDeviceOffloading(Action::OFK_OpenMP)) {
GPUArchName = Args.getLastArgValue(options::OPT_march_EQ);
assert(!GPUArchName.empty() && "Must have an architecture passed in.");
} else
GPUArchName = JA.getOffloadingArch();
// Obtain architecture from the action.
CudaArch gpu_arch = StringToCudaArch(GPUArchName);
assert(gpu_arch != CudaArch::UNKNOWN &&
"Device action expected to have an architecture.");
// Check that our installation's ptxas supports gpu_arch.
if (!Args.hasArg(options::OPT_no_cuda_version_check)) {
TC.CudaInstallation.CheckCudaVersionSupportsArch(gpu_arch);
}
ArgStringList CmdArgs;
CmdArgs.push_back(TC.getTriple().isArch64Bit() ? "-m64" : "-m32");
if (Args.hasFlag(options::OPT_cuda_noopt_device_debug,
options::OPT_no_cuda_noopt_device_debug, false)) {
// ptxas does not accept -g option if optimization is enabled, so
// we ignore the compiler's -O* options if we want debug info.
CmdArgs.push_back("-g");
CmdArgs.push_back("--dont-merge-basicblocks");
CmdArgs.push_back("--return-at-end");
} else if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
// Map the -O we received to -O{0,1,2,3}.
//
// TODO: Perhaps we should map host -O2 to ptxas -O3. -O3 is ptxas's
// default, so it may correspond more closely to the spirit of clang -O2.
// -O3 seems like the least-bad option when -Osomething is specified to
// clang but it isn't handled below.
StringRef OOpt = "3";
if (A->getOption().matches(options::OPT_O4) ||
A->getOption().matches(options::OPT_Ofast))
OOpt = "3";
else if (A->getOption().matches(options::OPT_O0))
OOpt = "0";
else if (A->getOption().matches(options::OPT_O)) {
// -Os, -Oz, and -O(anything else) map to -O2, for lack of better options.
OOpt = llvm::StringSwitch<const char *>(A->getValue())
.Case("1", "1")
.Case("2", "2")
.Case("3", "3")
.Case("s", "2")
.Case("z", "2")
.Default("2");
}
CmdArgs.push_back(Args.MakeArgString(llvm::Twine("-O") + OOpt));
} else {
// If no -O was passed, pass -O0 to ptxas -- no opt flag should correspond
// to no optimizations, but ptxas's default is -O3.
CmdArgs.push_back("-O0");
}
// Pass -v to ptxas if it was passed to the driver.
if (Args.hasArg(options::OPT_v))
CmdArgs.push_back("-v");
CmdArgs.push_back("--gpu-name");
CmdArgs.push_back(Args.MakeArgString(CudaArchToString(gpu_arch)));
CmdArgs.push_back("--output-file");
CmdArgs.push_back(Args.MakeArgString(TC.getInputFilename(Output)));
for (const auto& II : Inputs)
CmdArgs.push_back(Args.MakeArgString(II.getFilename()));
for (const auto& A : Args.getAllArgValues(options::OPT_Xcuda_ptxas))
CmdArgs.push_back(Args.MakeArgString(A));
// In OpenMP we need to generate relocatable code.
if (JA.isOffloading(Action::OFK_OpenMP) &&
Args.hasFlag(options::OPT_fopenmp_relocatable_target,
options::OPT_fnoopenmp_relocatable_target,
/*Default=*/ true))
CmdArgs.push_back("-c");
const char *Exec;
if (Arg *A = Args.getLastArg(options::OPT_ptxas_path_EQ))
Exec = A->getValue();
else
Exec = Args.MakeArgString(TC.GetProgramPath("ptxas"));
C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
}