78 lines
2.0 KiB
Rust
78 lines
2.0 KiB
Rust
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// compile-flags: -O
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// ignore-debug: the debug assertions get in the way
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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_index_len_fail
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if let Some(idx) = s.iter().position(|b| *b == b'\\') {
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&s[..idx]
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} else {
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s
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}
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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_index_len_fail
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if let Some(idx) = s.iter().position(|b| *b == b'\\') {
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&s[idx..]
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} else {
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s
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}
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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_index_len_fail
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if let Some(idx) = s.iter().position(|b| *b == 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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// 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_index_len_fail
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if let Some(idx) = s.iter().rposition(|b| *b == b'\\') {
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&s[..idx]
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} else {
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s
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}
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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_index_len_fail
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if let Some(idx) = s.iter().rposition(|b| *b == b'\\') {
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&s[idx..]
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} else {
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s
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}
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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_index_len_fail
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if let Some(idx) = s.iter().rposition(|b| *b == 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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