| //@ compile-flags: -C opt-level=z --edition=2021 |
| |
| #![crate_type = "lib"] |
| |
| // From <https://github.com/rust-lang/rust/issues/115463> |
| |
| // CHECK-LABEL: @read_up_to_8( |
| #[no_mangle] |
| pub fn read_up_to_8(buf: &[u8]) -> u64 { |
| // CHECK-NOT: unwrap_failed |
| if buf.len() < 4 { |
| // actual instance has more code. |
| return 0; |
| } |
| let lo = u32::from_le_bytes(buf[..4].try_into().unwrap()) as u64; |
| let hi = u32::from_le_bytes(buf[buf.len() - 4..][..4].try_into().unwrap()) as u64; |
| lo | (hi << 8 * (buf.len() as u64 - 4)) |
| } |
| |
| // CHECK-LABEL: @checking_unwrap_expectation( |
| #[no_mangle] |
| pub fn checking_unwrap_expectation(buf: &[u8]) -> &[u8; 4] { |
| // CHECK: call void @{{.*core6result13unwrap_failed}} |
| buf.try_into().unwrap() |
| } |
