rust/tests/codegen/nrvo.rs
2023-01-11 09:32:08 +00:00

18 lines
432 B
Rust

// compile-flags: -O
#![crate_type = "lib"]
// Ensure that we do not call `memcpy` for the following function.
// `memset` and `init` should be called directly on the return pointer.
#[no_mangle]
pub fn nrvo(init: fn(&mut [u8; 4096])) -> [u8; 4096] {
// CHECK-LABEL: nrvo
// CHECK: @llvm.memset
// CHECK-NOT: @llvm.memcpy
// CHECK: ret
// CHECK-EMPTY
let mut buf = [0; 4096];
init(&mut buf);
buf
}