================
@@ -708,6 +712,34 @@ void amdgpu::getAMDGPUTargetFeatures(const Driver &D,
options::OPT_m_amdgpu_Features_Group);
}
+static unsigned GetFullLTOPartitions(const Driver &D, const ArgList &Args) {
+ const Arg *A = Args.getLastArg(options::OPT_flto_partitions_EQ);
+ // In the absence of an option, use the number of available threads with a
cap
+ // at 16 partitions. More than 16 partitions rarely benefits code splitting
+ // and can lead to more empty/small modules each with their own overhead.
+ if (!A)
+ return std::min(16u, llvm::hardware_concurrency().compute_thread_count());
+ int Value;
+ if (StringRef(A->getValue()).getAsInteger(10, Value) || (Value < 1)) {
+ D.Diag(diag::err_drv_invalid_int_value)
+ << A->getAsString(Args) << A->getValue();
+ return 1;
+ }
+
+ return Value;
+}
+
+void amdgpu::addFullLTOPartitionOption(const Driver &D,
+ const llvm::opt::ArgList &Args,
+ llvm::opt::ArgStringList &CmdArgs) {
+ // TODO: restrict to gpu-rdc only?
----------------
jhuber6 wrote:
`-fno-gpu-rdc` mode doesn't use LTO because the clang `-cc1` job just emits an
ELF directly. However you could easily make the ELF job emit IR and it would
go through the linker just fine.
https://github.com/llvm/llvm-project/pull/128509
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