mirror of
https://github.com/rust-lang/rust.git
synced 2025-11-03 22:49:17 +00:00
38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
//@ compile-flags: -Copt-level=3
|
|
#![crate_type = "lib"]
|
|
|
|
// This test checks that we can inline drop_in_place in
|
|
// unwind landing pads.
|
|
|
|
// Without inlining, the box pointers escape via the call to drop_in_place,
|
|
// and LLVM will not optimize out the pointer comparison.
|
|
// With inlining, everything should be optimized out.
|
|
// See https://github.com/rust-lang/rust/issues/46515
|
|
// CHECK-LABEL: @check_no_escape_in_landingpad
|
|
// CHECK: start:
|
|
// CHECK-NEXT: __rust_no_alloc_shim_is_unstable
|
|
// CHECK-NEXT: __rust_no_alloc_shim_is_unstable
|
|
// CHECK-NEXT: ret void
|
|
#[no_mangle]
|
|
pub fn check_no_escape_in_landingpad(f: fn()) {
|
|
let x = &*Box::new(0);
|
|
let y = &*Box::new(0);
|
|
|
|
if x as *const _ == y as *const _ {
|
|
f();
|
|
}
|
|
}
|
|
|
|
// Without inlining, the compiler can't tell that
|
|
// dropping an empty string (in a landing pad) does nothing.
|
|
// With inlining, the landing pad should be optimized out.
|
|
// See https://github.com/rust-lang/rust/issues/87055
|
|
// CHECK-LABEL: @check_eliminate_noop_drop
|
|
// CHECK: call void %g()
|
|
// CHECK-NEXT: ret void
|
|
#[no_mangle]
|
|
pub fn check_eliminate_noop_drop(g: fn()) {
|
|
let _var = String::new();
|
|
g();
|
|
}
|