29 lines
979 B
Rust
29 lines
979 B
Rust
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// With -Zub-checks=yes (enabled by default by -Cdebug-assertions=yes) we will produce a runtime
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// check that the index to slice::get_unchecked is in-bounds of the slice. That is tested for by
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// tests/ui/precondition-checks/out-of-bounds-get-unchecked.rs
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//
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// This test ensures that such a runtime check is *not* emitted when debug-assertions are enabled,
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// but ub-checks are explicitly disabled.
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//@ revisions: DEBUG NOCHECKS
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//@ [DEBUG] compile-flags:
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//@ [NOCHECKS] compile-flags: -Zub-checks=no
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//@ compile-flags: -O -Cdebug-assertions=yes
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#![crate_type = "lib"]
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use std::ops::Range;
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// CHECK-LABEL: @slice_get_unchecked(
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#[no_mangle]
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pub unsafe fn slice_get_unchecked(x: &[i32], i: usize) -> &i32 {
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// CHECK: icmp ult
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// NOCHECKS: tail call void @llvm.assume
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// DEBUG: br i1
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// DEBUG: call core::panicking::panic_nounwind
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// DEBUG: unreachable
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// CHECK: getelementptr inbounds
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// CHECK: ret ptr
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x.get_unchecked(i)
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}
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