src/test/codegen/call-llvm-intrinsics.rs

   1 // compile-flags: -C no-prepopulate-passes
   2
   3 #![feature(link_llvm_intrinsics)]
   4 #![crate_type = "lib"]
   5
   6 struct A;
   7
   8 impl Drop for A {
   9     fn drop(&mut self) {
  10         println!("A");
  11     }
  12 }
  13
  14 extern {
  15     #[link_name = "llvm.sqrt.f32"]
  16     fn sqrt(x: f32) -> f32;
  17 }
  18
  19 pub fn do_call() {
  20     let _a = A;
  21
  22     unsafe {
  23         // Ensure that we `call` LLVM intrinsics instead of trying to `invoke` them
  24         // CHECK: call float @llvm.sqrt.f32(float 4.000000e+00
  25         sqrt(4.0);
  26     }
  27 }