diff options
Diffstat (limited to 'compiler/rustc_codegen_llvm/src/llvm_util.rs')
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/llvm_util.rs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_llvm/src/llvm_util.rs b/compiler/rustc_codegen_llvm/src/llvm_util.rs index a2a5499597c..201cfbb1918 100644 --- a/compiler/rustc_codegen_llvm/src/llvm_util.rs +++ b/compiler/rustc_codegen_llvm/src/llvm_util.rs @@ -536,6 +536,11 @@ pub(crate) fn global_llvm_features( // -Ctarget-cpu=native match sess.opts.cg.target_cpu { Some(ref s) if s == "native" => { + // We have already figured out the actual CPU name with `LLVMRustGetHostCPUName` and set + // that for LLVM, so the features implied by that CPU name will be available everywhere. + // However, that is not sufficient: e.g. `skylake` alone is not sufficient to tell if + // some of the instructions are available or not. So we have to also explicitly ask for + // the exact set of features available on the host, and enable all of them. let features_string = unsafe { let ptr = llvm::LLVMGetHostCPUFeatures(); let features_string = if !ptr.is_null() { |