tests/codegen/nrvo.rs

   1 // compile-flags: -O
   2
   3 #![crate_type = "lib"]
   4
   5 // Ensure that we do not call `memcpy` for the following function.
   6 // `memset` and `init` should be called directly on the return pointer.
   7 #[no_mangle]
   8 pub fn nrvo(init: fn(&mut [u8; 4096])) -> [u8; 4096] {
   9     // CHECK-LABEL: nrvo
  10     // CHECK: @llvm.memset
  11     // CHECK-NOT: @llvm.memcpy
  12     // CHECK: ret
  13     // CHECK-EMPTY
  14     let mut buf = [0; 4096];
  15     init(&mut buf);
  16     buf
  17 }