src/test/codegen/naked-noinline.rs

   1 // Checks that naked functions are never inlined.
   2 // compile-flags: -O -Zmir-opt-level=3
   3 // ignore-wasm32
   4 #![crate_type = "lib"]
   5 #![feature(asm)]
   6 #![feature(naked_functions)]
   7
   8 #[inline(always)]
   9 #[naked]
  10 #[no_mangle]
  11 pub unsafe extern "C" fn f() {
  12 // Check that f has naked and noinline attributes.
  13 //
  14 // CHECK:       define void @f() unnamed_addr [[ATTR:#[0-9]+]]
  15 // CHECK-NEXT:  start:
  16 // CHECK-NEXT:    call void asm
  17     asm!("", options(noreturn));
  18 }
  19
  20 #[no_mangle]
  21 pub unsafe fn g() {
  22 // Check that call to f is not inlined.
  23 //
  24 // CHECK-LABEL: define void @g()
  25 // CHECK-NEXT:  start:
  26 // CHECK-NEXT:    call void @f()
  27     f();
  28 }
  29
  30 // CHECK: attributes [[ATTR]] = { naked noinline{{.*}} }