mirror of https://github.com/rust-lang/rust
42 lines
989 B
Rust
42 lines
989 B
Rust
//@ compile-flags: -Cno-prepopulate-passes -Copt-level=0
|
|
|
|
#![crate_type = "lib"]
|
|
|
|
#[no_mangle]
|
|
pub fn demo_for_i32() {
|
|
generic_impl::<i32>();
|
|
}
|
|
|
|
// Two important things here:
|
|
// - We replace the "then" block with `unreachable` to avoid linking problems
|
|
// - We neither declare nor define the `big_impl` that said block "calls".
|
|
|
|
// CHECK-LABEL: ; skip_mono_inside_if_false::generic_impl
|
|
// CHECK: start:
|
|
// CHECK-NEXT: br label %[[ELSE_BRANCH:bb[0-9]+]]
|
|
// CHECK: [[ELSE_BRANCH]]:
|
|
// CHECK-NEXT: call skip_mono_inside_if_false::small_impl
|
|
// CHECK: bb{{[0-9]+}}:
|
|
// CHECK-NEXT: ret void
|
|
// CHECK: bb{{[0-9+]}}:
|
|
// CHECK-NEXT: unreachable
|
|
|
|
fn generic_impl<T>() {
|
|
trait MagicTrait {
|
|
const IS_BIG: bool;
|
|
}
|
|
impl<T> MagicTrait for T {
|
|
const IS_BIG: bool = std::mem::size_of::<T>() > 10;
|
|
}
|
|
if T::IS_BIG {
|
|
big_impl::<T>();
|
|
} else {
|
|
small_impl::<T>();
|
|
}
|
|
}
|
|
|
|
#[inline(never)]
|
|
fn small_impl<T>() {}
|
|
#[inline(never)]
|
|
fn big_impl<T>() {}
|