| //@ compile-flags: -O |
| #![crate_type = "lib"] |
| |
| // Make sure no bounds checks are emitted when slicing or indexing |
| // with an index from `position()` or `rposition()`. |
| |
| // CHECK-LABEL: @position_slice_to_no_bounds_check |
| #[no_mangle] |
| pub fn position_slice_to_no_bounds_check(s: &[u8]) -> &[u8] { |
| // CHECK-NOT: panic |
| // CHECK-NOT: slice_start_index_len_fail |
| // CHECK-NOT: slice_end_index_len_fail |
| // CHECK-NOT: panic_bounds_check |
| // CHECK-NOT: unreachable |
| if let Some(idx) = s.iter().position(|b| *b == b'\\') { &s[..idx] } else { s } |
| } |
| |
| // CHECK-LABEL: @position_slice_from_no_bounds_check |
| #[no_mangle] |
| pub fn position_slice_from_no_bounds_check(s: &[u8]) -> &[u8] { |
| // CHECK-NOT: panic |
| // CHECK-NOT: slice_start_index_len_fail |
| // CHECK-NOT: slice_end_index_len_fail |
| // CHECK-NOT: panic_bounds_check |
| // CHECK-NOT: unreachable |
| if let Some(idx) = s.iter().position(|b| *b == b'\\') { &s[idx..] } else { s } |
| } |
| |
| // CHECK-LABEL: @position_index_no_bounds_check |
| #[no_mangle] |
| pub fn position_index_no_bounds_check(s: &[u8]) -> u8 { |
| // CHECK-NOT: panic |
| // CHECK-NOT: slice_start_index_len_fail |
| // CHECK-NOT: slice_end_index_len_fail |
| // CHECK-NOT: panic_bounds_check |
| // CHECK-NOT: unreachable |
| if let Some(idx) = s.iter().position(|b| *b == b'\\') { s[idx] } else { 42 } |
| } |
| // CHECK-LABEL: @rposition_slice_to_no_bounds_check |
| #[no_mangle] |
| pub fn rposition_slice_to_no_bounds_check(s: &[u8]) -> &[u8] { |
| // CHECK-NOT: panic |
| // CHECK-NOT: slice_start_index_len_fail |
| // CHECK-NOT: slice_end_index_len_fail |
| // CHECK-NOT: panic_bounds_check |
| // CHECK-NOT: unreachable |
| if let Some(idx) = s.iter().rposition(|b| *b == b'\\') { &s[..idx] } else { s } |
| } |
| |
| // CHECK-LABEL: @rposition_slice_from_no_bounds_check |
| #[no_mangle] |
| pub fn rposition_slice_from_no_bounds_check(s: &[u8]) -> &[u8] { |
| // CHECK-NOT: panic |
| // CHECK-NOT: slice_start_index_len_fail |
| // CHECK-NOT: slice_end_index_len_fail |
| // CHECK-NOT: panic_bounds_check |
| // CHECK-NOT: unreachable |
| if let Some(idx) = s.iter().rposition(|b| *b == b'\\') { &s[idx..] } else { s } |
| } |
| |
| // CHECK-LABEL: @rposition_index_no_bounds_check |
| #[no_mangle] |
| pub fn rposition_index_no_bounds_check(s: &[u8]) -> u8 { |
| // CHECK-NOT: panic |
| // CHECK-NOT: slice_start_index_len_fail |
| // CHECK-NOT: slice_end_index_len_fail |
| // CHECK-NOT: panic_bounds_check |
| // CHECK-NOT: unreachable |
| if let Some(idx) = s.iter().rposition(|b| *b == b'\\') { s[idx] } else { 42 } |
| } |
