Use probe-stack=inline-asm in LLVM 11+

1 files changed, 8 insertions, 3 deletions

diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs
index 97c38e04bc1..700f32e15b9 100644
--- a/compiler/rustc_codegen_llvm/src/attributes.rs
+++ b/compiler/rustc_codegen_llvm/src/attributes.rs
@@ -127,13 +127,18 @@ fn set_probestack(cx: &CodegenCx<'ll, '_>, llfn: &'ll Value) {
         return;
     }
 
-    // Flag our internal `__rust_probestack` function as the stack probe symbol.
-    // This is defined in the `compiler-builtins` crate for each architecture.
     llvm::AddFunctionAttrStringValue(
         llfn,
         llvm::AttributePlace::Function,
         const_cstr!("probe-stack"),
-        const_cstr!("__rust_probestack"),
+        if llvm_util::get_version() < (11, 0, 1) {
+            // Flag our internal `__rust_probestack` function as the stack probe symbol.
+            // This is defined in the `compiler-builtins` crate for each architecture.
+            const_cstr!("__rust_probestack")
+        } else {
+            // On LLVM 11+, emit inline asm for stack probes instead of a function call.
+            const_cstr!("inline-asm")
+        },
     );
 }