mirror of
https://github.com/rust-lang/rust.git
synced 2025-11-04 06:56:14 +00:00
28 lines
747 B
Rust
28 lines
747 B
Rust
//@ compile-flags: -Cno-prepopulate-passes -Copt-level=0 -Cpanic=abort
|
|
// Check that there's an alloca for the reference and the vector, but nothing else.
|
|
// We use panic=abort because unwinding panics give hint::black_box a cleanup block, which has
|
|
// another alloca.
|
|
|
|
#![crate_type = "lib"]
|
|
|
|
#[inline(never)]
|
|
fn test<const SIZE: usize>() {
|
|
// CHECK-LABEL: no_alloca_inside_if_false::test
|
|
// CHECK: start:
|
|
// CHECK-NEXT: alloca [{{12|24}} x i8]
|
|
// CHECK-NOT: alloca
|
|
if const { SIZE < 4096 } {
|
|
let arr = [0u8; SIZE];
|
|
std::hint::black_box(&arr);
|
|
} else {
|
|
let vec = vec![0u8; SIZE];
|
|
std::hint::black_box(&vec);
|
|
}
|
|
}
|
|
|
|
// CHECK-LABEL: @main
|
|
#[no_mangle]
|
|
pub fn main() {
|
|
test::<8192>();
|
|
}
|