mirror of https://github.com/rust-lang/rust.git
71 lines
2.4 KiB
Rust
71 lines
2.4 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 `position()` or `rposition()`.
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// CHECK-LABEL: @position_slice_to_no_bounds_check
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#[no_mangle]
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pub fn position_slice_to_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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// CHECK-NOT: unreachable
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if let Some(idx) = s.iter().position(|b| *b == b'\\') { &s[..idx] } else { s }
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}
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// CHECK-LABEL: @position_slice_from_no_bounds_check
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#[no_mangle]
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pub fn position_slice_from_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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// CHECK-NOT: unreachable
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if let Some(idx) = s.iter().position(|b| *b == b'\\') { &s[idx..] } else { s }
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}
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// CHECK-LABEL: @position_index_no_bounds_check
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#[no_mangle]
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pub fn position_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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// CHECK-NOT: unreachable
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if let Some(idx) = s.iter().position(|b| *b == b'\\') { s[idx] } else { 42 }
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}
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// CHECK-LABEL: @rposition_slice_to_no_bounds_check
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#[no_mangle]
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pub fn rposition_slice_to_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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// CHECK-NOT: unreachable
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if let Some(idx) = s.iter().rposition(|b| *b == b'\\') { &s[..idx] } else { s }
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}
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// CHECK-LABEL: @rposition_slice_from_no_bounds_check
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#[no_mangle]
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pub fn rposition_slice_from_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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// CHECK-NOT: unreachable
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if let Some(idx) = s.iter().rposition(|b| *b == b'\\') { &s[idx..] } else { s }
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}
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// CHECK-LABEL: @rposition_index_no_bounds_check
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#[no_mangle]
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pub fn rposition_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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// CHECK-NOT: unreachable
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if let Some(idx) = s.iter().rposition(|b| *b == b'\\') { s[idx] } else { 42 }
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}
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