| // min-llvm-version: 11.0.0 |
| // compile-flags: -O |
| // ignore-debug: the debug assertions get in the way |
| #![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_index_len_fail |
| 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_index_len_fail |
| 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_index_len_fail |
| 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_index_len_fail |
| 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_index_len_fail |
| 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_index_len_fail |
| if let Some(idx) = s.iter().rposition(|b| *b == b'\\') { |
| s[idx] |
| } else { |
| 42 |
| } |
| } |