diff options
Diffstat (limited to 'tests/codegen/binary-search-index-no-bound-check.rs')
-rw-r--r-- | tests/codegen/binary-search-index-no-bound-check.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/codegen/binary-search-index-no-bound-check.rs b/tests/codegen/binary-search-index-no-bound-check.rs new file mode 100644 index 000000000..c1766a4a4 --- /dev/null +++ b/tests/codegen/binary-search-index-no-bound-check.rs @@ -0,0 +1,38 @@ +// 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 `binary_search`. + +// CHECK-LABEL: @binary_search_index_no_bounds_check +#[no_mangle] +pub fn binary_search_index_no_bounds_check(s: &[u8]) -> u8 { + // CHECK-NOT: panic + // CHECK-NOT: slice_index_len_fail + if let Ok(idx) = s.binary_search(&b'\\') { + s[idx] + } else { + 42 + } +} + +// Similarly, check that `partition_point` is known to return a valid fencepost. + +// CHECK-LABEL: @unknown_split +#[no_mangle] +pub fn unknown_split(x: &[i32], i: usize) -> (&[i32], &[i32]) { + // This just makes sure that the subsequent function is looking for the + // absence of something that might actually be there. + + // CHECK: call core::panicking::panic + x.split_at(i) +} + +// CHECK-LABEL: @partition_point_split_no_bounds_check +#[no_mangle] +pub fn partition_point_split_no_bounds_check(x: &[i32], needle: i32) -> (&[i32], &[i32]) { + // CHECK-NOT: call core::panicking::panic + let i = x.partition_point(|p| p < &needle); + x.split_at(i) +} |