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-rw-r--r--tests/codegen/issues/issue-73396-bounds-check-after-position.rs77
1 files changed, 77 insertions, 0 deletions
diff --git a/tests/codegen/issues/issue-73396-bounds-check-after-position.rs b/tests/codegen/issues/issue-73396-bounds-check-after-position.rs
new file mode 100644
index 000000000..8d07a67a1
--- /dev/null
+++ b/tests/codegen/issues/issue-73396-bounds-check-after-position.rs
@@ -0,0 +1,77 @@
+// 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
+ }
+}