mirror of https://github.com/rust-lang/rust
40 lines
1.2 KiB
Rust
40 lines
1.2 KiB
Rust
//@ compile-flags: -O
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#![crate_type = "lib"]
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// Make sure no bounds checks are emitted when slicing or indexing
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// with an index from `binary_search`.
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// CHECK-LABEL: @binary_search_index_no_bounds_check
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#[no_mangle]
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pub fn binary_search_index_no_bounds_check(s: &[u8]) -> u8 {
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// CHECK-NOT: panic
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// CHECK-NOT: slice_start_index_len_fail
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// CHECK-NOT: slice_end_index_len_fail
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// CHECK-NOT: panic_bounds_check
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if let Ok(idx) = s.binary_search(&b'\\') {
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s[idx]
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} else {
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42
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}
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}
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// Similarly, check that `partition_point` is known to return a valid fencepost.
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// CHECK-LABEL: @unknown_split
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#[no_mangle]
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pub fn unknown_split(x: &[i32], i: usize) -> (&[i32], &[i32]) {
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// This just makes sure that the subsequent function is looking for the
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// absence of something that might actually be there.
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// CHECK: call core::panicking::panic
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x.split_at(i)
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}
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// CHECK-LABEL: @partition_point_split_no_bounds_check
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#[no_mangle]
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pub fn partition_point_split_no_bounds_check(x: &[i32], needle: i32) -> (&[i32], &[i32]) {
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// CHECK-NOT: call core::panicking::panic
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let i = x.partition_point(|p| p < &needle);
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x.split_at(i)
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}
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