mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-31 04:57:19 +00:00
25 lines
484 B
Rust
25 lines
484 B
Rust
//@ compile-flags: -O
|
|
|
|
#![crate_type = "lib"]
|
|
|
|
#[no_mangle]
|
|
// CHECK-LABEL: @noop(
|
|
pub fn noop(v: &mut Vec<u8>) {
|
|
// CHECK-NOT: reserve_for_push
|
|
// CHECK-NOT: call
|
|
// CHECK: tail call void @llvm.assume
|
|
// CHECK-NOT: reserve_for_push
|
|
// CHECK-NOT: call
|
|
// CHECK: ret
|
|
if let Some(x) = v.pop() {
|
|
v.push(x)
|
|
}
|
|
}
|
|
|
|
#[no_mangle]
|
|
// CHECK-LABEL: @push_byte(
|
|
pub fn push_byte(v: &mut Vec<u8>) {
|
|
// CHECK: call {{.*}}reserve_for_push
|
|
v.push(3);
|
|
}
|