| //@ compile-flags: -O |
| |
| #![crate_type = "lib"] |
| |
| // Adapted from <https://github.com/rust-lang/rust/issues/73258#issue-637346014> |
| |
| #[derive(Clone, Copy)] |
| #[repr(u8)] |
| pub enum Foo { |
| A, |
| B, |
| C, |
| D, |
| } |
| |
| // CHECK-LABEL: @issue_73258( |
| #[no_mangle] |
| pub unsafe fn issue_73258(ptr: *const Foo) -> Foo { |
| // CHECK-NOT: icmp |
| // CHECK-NOT: call |
| // CHECK-NOT: br |
| // CHECK-NOT: select |
| |
| // CHECK: %[[R:.+]] = load i8 |
| // CHECK-SAME: !range ! |
| |
| // CHECK-NOT: icmp |
| // CHECK-NOT: call |
| // CHECK-NOT: br |
| // CHECK-NOT: select |
| |
| // CHECK: ret i8 %[[R]] |
| |
| // CHECK-NOT: icmp |
| // CHECK-NOT: call |
| // CHECK-NOT: br |
| // CHECK-NOT: select |
| let k: Option<Foo> = Some(ptr.read()); |
| return k.unwrap(); |
| } |
